County · Texas
Harris County, Texas: drinking water records
Explore EPA records for 712 community water systems across 132 ZIP codes in Harris County, then find water-testing resources and available recent monitoring-station readings.
In focus712Community water systems
Public records. Clearer context.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
Drinking-water records
EPA survey and compliance records are historical reports. UCMR 5 results are available for 256 of the 712 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.
256
systems in EPA's PFAS survey
130
systems where PFAS was found
3
systems at or above the PFOA or PFOS limit, on the yearly-average basis EPA uses
63
systems that have reached the lead action level
121
systems with a health-based violation since 2016
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems in this county
All 712 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| City of Houston TX1010013 | 2,970,543 | 2,880 | 4 | 1 | 5 ppbbelow the action level |
| City of Deer Park TX1010007 | 34,495 | 120 | 6 | 1 | 0 ppbbelow the action level |
| Harris County MUD 24 TX1010572 | 14,796 | 300 | 3 | 1 | 2.4 ppbbelow the action level |
| City of Galena Park TX1010009 | 10,487 | 240 | 6 | 1 | 1.7 ppbbelow the action level |
| Mission Bend MUD 2 TX1011826 | 10,155 | 180 | 0 | 1 | 1.1 ppbbelow the action level |
| Trail of the Lakes MUD TX1010617 | 9,480 | 120 | 0 | 6 | 1 ppbbelow the action level |
| Rice University TX1010908 | 8,415 | 240 | 5 | 4 | 2.4 ppbbelow the action level |
| City of Jersey Village TX1010016 | 7,792 | 360 | 5 | 1 | 4.6 ppbbelow the action level |
| Harris County MUD 238 TX1012361 | 7,773 | 240 | 3 | 6 | 0.5 ppbbelow the action level |
| Parkway Utility District TX1010750 | 7,323 | 240 | 4 | 1 | 1.1 ppbbelow the action level |
| Harris County MUD 196 TX1013002 | 7,026 | 240 | 5 | 1 | 0 ppbbelow the action level |
| West Harris County MUD 10 TX1012068 | 6,697 | 120 | 0 | 1 | 0 ppbbelow the action level |
| West Harris County MUD 9 TX1011798 | 5,961 | 60 | 0 | 4 | 0 ppbbelow the action level |
| Harris County MUD 46 TX1010903 | 5,418 | 60 | 0 | 1 | 0.5 ppbbelow the action level |
| Bilma PUD TX1011872 | 5,397 | 240 | 4 | 1 | 5.4 ppbbelow the action level |
| Mayde Creek MUD TX1011689 | 5,301 | 60 | 3 | 1 | 2.2 ppbbelow the action level |
| Harris County WCID 114 TX1010317 | 5,160 | 210 | 3 | 4 | 4.5 ppbbelow the action level |
| Harris County MUD 119 TX1010626 | 4,758 | 120 | 1 | 1 | 1.2 ppbbelow the action level |
| Renn Road MUD TX1011834 | 4,464 | 60 | 0 | 1 | 1.8 ppbbelow the action level |
| Cypresswood Utility District TX1010432 | 4,305 | 360 | 3 | 1 | 0 ppbbelow the action level |
| City of Pasadena TX1010293 | 152,000 | 716 | 7 | 0 | 3.7 ppbbelow the action level |
| Clear Lake City Water Authority TX1010056 | 89,702 | 540 | 8 | 0 | 1.2 ppbbelow the action level |
| City of Baytown TX1010003 | 86,004 | 240 | 7 | 0 | 2.1 ppbbelow the action level |
| City of Houston UD 5 - Kingwood TX1010348 | 80,073 | 360 | 0 | 0 | 1.9 ppbbelow the action level |
| Harris County MUD 165 TX1012187 | 40,503 | 300 | 2 | 0 | 1.3 ppbbelow the action level |
| City of la Porte TX1010018 | 36,569 | 480 | 3 | 0 | 2.4 ppbbelow the action level |
| Northwest Harris County MUD 5 TX1010884 | 25,425 | 300 | 3 | 0 | 0 ppbbelow the action level |
| City of Katy TX1010017 | 25,253 | 360 | 0 | 0 | 2.7 ppbbelow the action level |
| Bridgestone MUD TX1011550 | 24,528 | 360 | 1 | 0 | 0 ppbbelow the action level |
| Timber Lane Utility District TX1010278 | 24,507 | 240 | 0 | 0 | 2.1 ppbbelow the action level |
| Harris County FWSD 51 TX1010238 | 19,671 | 240 | 4 | 0 | 1.6 ppbbelow the action level |
| Cimarron MUD TX1011410 | 19,338 | 180 | 0 | 0 | 0 ppbbelow the action level |
| City of West University Place TX1010027 | 19,200 | 240 | 6 | 0 | 2.9 ppbbelow the action level |
| Harris County MUD 82 TX1010630 | 18,990 | 180 | 0 | 0 | 3.3 ppbbelow the action level |
| Northwest Park MUD TX1010593 | 18,168 | 180 | 0 | 0 | 1 ppbbelow the action level |
| Clear Brook City MUD TX1010418 | 18,108 | 480 | 6 | 0 | 3.8 ppbbelow the action level |
| City of Bellaire TX1010004 | 18,090 | 300 | 5 | 0 | 1.2 ppbbelow the action level |
| Harris Montgomery Counties MUD 386 TX1013305 | 18,018 | 180 | 0 | 0 | 1.4 ppbbelow the action level |
| Harris County MUD 53 TX1010720 | 17,856 | 240 | 5 | 0 | 0 ppbbelow the action level |
| City of Tomball TX1010026 | 17,532 | 120 | 0 | 0 | 1.6 ppbbelow the action level |
| City of South Houston TX1010294 | 17,397 | 120 | 6 | 0 | 1.2 ppbbelow the action level |
| Harris County MUD 26 TX1010715 | 17,178 | 180 | 0 | 0 | 1.0 ppbbelow the action level |
| Harris County MUD 71 TX1011823 | 17,079 | 180 | 0 | 0 | 9.5 ppbbelow the action level |
| Harris County MUD 167 TX1012842 | 16,761 | 120 | 0 | 0 | 0.5 ppbbelow the action level |
| Harris County MUD 55 Heritage Park TX1010678 | 16,392 | 176 | 4 | 0 | 0.9 ppbbelow the action level |
| City of Humble TX1010014 | 15,616 | 300 | 4 | 0 | 3.9 ppbbelow the action level |
| Harris County FWSD 61 TX1010237 | 15,400 | 240 | 0 | 0 | 2 ppbbelow the action level |
| Harris County MUD 105 TX1011227 | 14,925 | 180 | 3 | 0 | 1.6 ppbbelow the action level |
| Harris County MUD 200 Cranbrook TX1012007 | 14,868 | 300 | 3 | 0 | 1.0 ppbbelow the action level |
| Cnp Utility District TX1010429 | 14,718 | 240 | 3 | 0 | 0 ppbbelow the action level |
| Harris County MUD 285 TX1012677 | 14,268 | 240 | 5 | 0 | 0 ppbbelow the action level |
| City of Houston Willow Chase TX1011902 | 14,169 | 240 | 0 | 0 | 0 ppbbelow the action level |
| Meadowhill Regional MUD TX1010387 | 13,863 | 180 | 0 | 0 | 0.6 ppbbelow the action level |
| Harris County WCID 21 TX1010769 | 13,845 | 95 | 2 | 0 | 3.0 ppbbelow the action level |
| Remington MUD 1 TX1013074 | 13,746 | 236 | 4 | 0 | 0 ppbbelow the action level |
| City of Webster TX1010226 | 13,710 | 120 | 7 | 0 | 2.5 ppbbelow the action level |
| City of Seabrook TX1010062 | 13,560 | 180 | 5 | 0 | 0 ppbbelow the action level |
| Harris County MUD 120 TX1010774 | 13,197 | 120 | 0 | 0 | 1.9 ppbbelow the action level |
| Newport MUD TX1010362 | 13,191 | 155 | 3 | 0 | 1.4 ppbbelow the action level |
| Harris County MUD 157 TX1011430 | 13,062 | 180 | 4 | 0 | 1 ppbbelow the action level |
| Harris County MUD 168 TX1011783 | 13,029 | 180 | 0 | 0 | 1.1 ppbbelow the action level |
| Harris County MUD 1 TX1010539 | 12,342 | 180 | 0 | 0 | 2.9 ppbbelow the action level |
| Northampton MUD TX1010337 | 12,162 | 180 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 368 TX1011908 | 11,835 | 240 | 3 | 0 | 0 ppbbelow the action level |
| Harris County MUD 153 TX1012133 | 11,781 | 120 | 0 | 0 | 4.3 ppbbelow the action level |
| Harris County MUD 81 TX1010581 | 11,514 | 240 | 0 | 0 | 0 ppbbelow the action level |
| Memorial Villages Water Authority TX1010148 | 11,382 | 360 | 2 | 0 | 4.1 ppbbelow the action level |
| Harris County UD 6 TX1010501 | 11,262 | 120 | 3 | 0 | 1.7 ppbbelow the action level |
| Harris County WCID 36 TX1010239 | 11,073 | 360 | 5 | 0 | 1 ppbbelow the action level |
| Cypress Hill MUD 1 TX1012378 | 11,052 | 120 | 0 | 0 | 2.2 ppbbelow the action level |
| Harris County MUD 49 TX1011462 | 10,893 | 120 | 3 | 0 | 1.6 ppbbelow the action level |
| Harris County MUD 278 TX1012835 | 10,584 | 240 | 3 | 0 | 1.2 ppbbelow the action level |
| Harris County WCID 96 TX1013175 | 10,530 | 60 | 3 | 0 | 0.5 ppbbelow the action level |
| Greenwood Utility District TX1010554 | 10,527 | 240 | 3 | 0 | 0 ppbbelow the action level |
| Harris County MUD 230 TX1012740 | 10,404 | 60 | 3 | 0 | 0 ppbbelow the action level |
| Harris County MUD 102 TX1010503 | 10,401 | 238 | 5 | 0 | 2 ppbbelow the action level |
| Langham Creek Utility District TX1011249 | 10,377 | 322 | 5 | 0 | 0 ppbbelow the action level |
| Harris County WCID 109 TX1010359 | 10,134 | 360 | 3 | 0 | 2.4 ppbbelow the action level |
| Ponderosa Forest Utility District TX1010384 | 10,101 | 180 | 1 | 0 | 8.5 ppbbelow the action level |
| Harris County WCID 110 TX1010482 | 9,807 | 120 | 1 | 0 | 1.8 ppbbelow the action level |
| City of Jacinto City TX1010015 | 9,613 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 109 TX1010620 | 9,501 | 120 | 0 | 0 | 2.1 ppbbelow the action level |
| Harris County MUD 188 TX1011982 | 9,453 | 120 | 3 | 0 | 3.7 ppbbelow the action level |
| Hunters Glen MUD TX1010615 | 9,405 | 120 | 0 | 0 | 2.2 ppbbelow the action level |
| Harris-Fort Bend Counties MUD 3 TX1013365 | 9,297 | 60 | 0 | 0 | 2.3 ppbbelow the action level |
| Harris County WCID 119 TX1010509 | 9,150 | 240 | 4 | 0 | 0 ppbbelow the action level |
| Harris County WCID 89 TX1012370 | 9,033 | 240 | 0 | 0 | 0.2 ppbbelow the action level |
| Barker Cypress MUD TX1011613 | 8,976 | 240 | 4 | 0 | 0 ppbbelow the action level |
| Sunbelt FWSD High Meadows Subdivision TX1010292 | 8,946 | 180 | 2 | 0 | 2.8 ppbbelow the action level |
| Chelford City MUD TX1010782 | 8,917 | 240 | 0 | 0 | 1 ppbbelow the action level |
| Faulkey Gully MUD TX1011602 | 8,907 | 120 | 4 | 0 | 1.5 ppbbelow the action level |
| Mason Creek Utility District TX1010379 | 8,900 | 180 | 0 | 0 | 2.1 ppbbelow the action level |
| Harris County MUD 391 TX1013253 | 8,835 | 120 | 0 | 0 | 0.7 ppbbelow the action level |
| Harris County MUD 132 TX1010616 | 8,682 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Harris County WCID 1 TX1010159 | 8,559 | 240 | 6 | 0 | 0 ppbbelow the action level |
| Jackrabbit Road PUD TX1010538 | 8,346 | 240 | 5 | 0 | 2.9 ppbbelow the action level |
| Harris County MUD 154 TX1011642 | 8,289 | 120 | 0 | 0 | 1.2 ppbbelow the action level |
| Harris County MUD 290 TX1013294 | 8,259 | 60 | 0 | 0 | 0 ppbbelow the action level |
| West Harris County MUD 11 TX1012858 | 8,205 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Bissonnet MUD TX1010883 | 8,160 | 120 | 0 | 0 | 1.8 ppbbelow the action level |
| Addicks Utility District TX1011019 | 8,076 | 240 | 5 | 0 | 0 ppbbelow the action level |
| Harris County MUD 468 TX1013369 | 7,944 | 120 | 3 | 0 | 0.1 ppbbelow the action level |
| Northwest Harris County MUD 9 TX1011599 | 7,848 | 120 | 0 | 0 | 43.8 ppbat or above the action level |
| Northwest Harris County MUD 12 TX1011901 | 7,764 | 60 | 2 | 0 | 1.4 ppbbelow the action level |
| Northwest Harris County MUD 10 TX1011649 | 7,671 | 180 | 0 | 0 | 0.6 ppbbelow the action level |
| Weston MUD TX1010634 | 7,647 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 151 TX1010905 | 7,464 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Cy Champ PUD TX1011522 | 7,428 | 120 | 1 | 0 | 3.1 ppbbelow the action level |
| Harris County MUD 419 TX1013335 | 7,389 | 60 | 3 | 0 | 1.1 ppbbelow the action level |
| Emerald Forest Utility District TX1010541 | 7,326 | 120 | 2 | 0 | 0 ppbbelow the action level |
| Harris County MUD 152 TX1010902 | 7,314 | 120 | 0 | 0 | 0.8 ppbbelow the action level |
| Malcomson Road Utility District TX1010495 | 7,231 | 210 | 3 | 0 | 0 ppbbelow the action level |
| Windfern Forest Utility District TX1010924 | 7,170 | 240 | 3 | 0 | 0 ppbbelow the action level |
| Lake Forest Utility District TX1010494 | 7,106 | 120 | 3 | 0 | 12.7 ppbbelow the action level |
| Nottingham Country MUD TX1012315 | 7,089 | 60 | 0 | 0 | 1.8 ppbbelow the action level |
| Dowdell PUD TX1010592 | 7,002 | 210 | 0 | 0 | 1 ppbbelow the action level |
| Harris County MUD 96 TX1013343 | 6,993 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Sagemeadow Utility District TX1010386 | 6,975 | 240 | 5 | 0 | 4.6 ppbbelow the action level |
| Pine Trails Utility TX1010535 | 6,969 | 120 | 6 | 0 | 1.3 ppbbelow the action level |
| Reid Road MUD 1 TX1010872 | 6,969 | 120 | 0 | 0 | 1.9 ppbbelow the action level |
| West Harris County MUD 2 Chase TX1011029 | 6,921 | 60 | 0 | 0 | 1.2 ppbbelow the action level |
| Northwest Harris County MUD 15 TX1011600 | 6,915 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 189 TX1011809 | 6,906 | 60 | 0 | 0 | 2.5 ppbbelow the action level |
| Sunbelt FWSD Oakwilde Subdivision TX1010022 | 6,819 | 240 | 2 | 0 | 0.5 ppbbelow the action level |
| Harris County MUD 158 TX1012297 | 6,798 | 60 | 0 | 0 | 2.0 ppbbelow the action level |
| Harris County MUD 150 TX1011250 | 6,786 | 240 | 3 | 0 | 0 ppbbelow the action level |
| Harris County MUD 367 TX1013040 | 6,759 | 120 | 3 | 0 | 0 ppbbelow the action level |
| Harris County MUD 64 TX1011513 | 6,726 | 60 | 0 | 0 | 1.6 ppbbelow the action level |
| Fallbrook Utility District TX1010340 | 6,720 | 120 | 1 | 0 | 0 ppbbelow the action level |
| Mills Road MUD TX1011107 | 6,717 | 120 | 1 | 0 | 0 ppbbelow the action level |
| North Park PUD TX1010745 | 6,708 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 118 TX1010897 | 6,678 | 60 | 0 | 0 | 1.0 ppbbelow the action level |
| Memorial MUD TX1011242 | 6,615 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Heatherloch MUD TX1010548 | 6,612 | 120 | 5 | 0 | 1.6 ppbbelow the action level |
| Horsepen Bayou MUD TX1011785 | 6,597 | 240 | 4 | 0 | 1.1 ppbbelow the action level |
| Interstate MUD TX1012264 | 6,591 | 120 | 5 | 0 | 0.6 ppbbelow the action level |
| Harris County MUD 354 TX1012965 | 6,588 | 60 | 0 | 0 | 0.6 ppbbelow the action level |
| Harris County WCID 84 TX1010113 | 6,552 | 120 | 1 | 0 | 0 ppbbelow the action level |
| Mission Bend MUD 1 TX1011718 | 6,546 | 95 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 65 TX1011678 | 6,330 | 60 | 0 | 0 | 0.6 ppbbelow the action level |
| Harris County MUD 364 TX1013132 | 6,168 | 108 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 222 TX1013054 | 6,129 | 60 | 0 | 0 | 0.9 ppbbelow the action level |
| City of Houston District 73 TX1011585 | 6,105 | 120 | 0 | 0 | 3.1 ppbbelow the action level |
| Harris County UD 16 TX1013156 | 6,069 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Lake MUD TX1011741 | 6,048 | 120 | 4 | 0 | 0 ppbbelow the action level |
| Harris County MUD 16 TX1011705 | 5,982 | 120 | 2 | 0 | 0 ppbbelow the action level |
| Harris County MUD 43 TX1010565 | 5,940 | 60 | 0 | 0 | 2.1 ppbbelow the action level |
| Prestonwood Forest Utility District TX1010467 | 5,940 | 240 | 3 | 0 | 0 ppbbelow the action level |
| Harris County MUD 180 TX1011799 | 5,892 | 60 | 0 | 0 | 0.7 ppbbelow the action level |
| Harris County WCID 74 TX1010480 | 5,886 | 120 | 0 | 0 | 5.5 ppbbelow the action level |
| Charterwood MUD TX1010632 | 5,832 | 120 | 1 | 0 | 5.6 ppbbelow the action level |
| Harris County MUD 70 TX1011690 | 5,763 | 120 | 5 | 0 | 1.9 ppbbelow the action level |
| Spencer Road PUD TX1010654 | 5,607 | 240 | 7 | 0 | 0 ppbbelow the action level |
| Harris County MUD 239 TX1012392 | 5,583 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 374 Cypress Creek Lake TX1013450 | 5,526 | 120 | 3 | 0 | 1.8 ppbbelow the action level |
| Harris County MUD 163 TX1012213 | 5,487 | 120 | 4 | 0 | 8.4 ppbbelow the action level |
| Harris County MUD 5 TX1010500 | 5,487 | 120 | 0 | 0 | 1.0 ppbbelow the action level |
| Harris County MUD 148 Kingslake TX1010938 | 5,448 | 120 | 4 | 0 | 0 ppbbelow the action level |
| Chimney Hill MUD TX1010910 | 5,409 | 179 | 3 | 0 | 0 ppbbelow the action level |
| Tattor Road MUD TX1010625 | 5,400 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 86 TX1012953 | 5,397 | 120 | 2 | 0 | 1.2 ppbbelow the action level |
| City of Nassau Bay TX1010152 | 5,347 | 240 | 4 | 0 | 0 ppbbelow the action level |
| Mount Houston Road MUD TX1010728 | 5,346 | 120 | 0 | 0 | 0.5 ppbbelow the action level |
| Westador MUD TX1010277 | 5,337 | 120 | 0 | 0 | 2 ppbbelow the action level |
| Cornerstones MUD TX1011692 | 5,331 | 60 | 0 | 0 | 0 ppbbelow the action level |
| West Harris County MUD 7 TX1012228 | 5,289 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 127 TX1012229 | 5,247 | 120 | 2 | 0 | 0.6 ppbbelow the action level |
| Harris County MUD 400 - West TX1013310 | 5,217 | 60 | 0 | 0 | 1.7 ppbbelow the action level |
| Harris County MUD 33 TX1011162 | 5,181 | 60 | 0 | 0 | 0.6 ppbbelow the action level |
| Crosby MUD TX1010118 | 5,130 | 0 | 0 | 1 | 0.8 ppbbelow the action level |
| Harris County MUD 179 TX1011848 | 5,115 | 120 | 4 | 0 | 1 ppbbelow the action level |
| Harris County MUD 276 TX1012942 | 5,094 | 240 | 3 | 0 | 4.2 ppbbelow the action level |
| Harris County WCID 133 TX1010210 | 5,082 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Harris County Improvement District 18 TX1013479 | 5,025 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Northwest Harris County MUD 32 TX1013034 | 5,016 | 60 | 0 | 0 | 1.6 ppbbelow the action level |
| Harris County MUD 495 TX1013532 | 5,007 | 60 | 0 | 0 | 0 ppbbelow the action level |
| North Green MUD TX1010331 | 4,941 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Ricewood MUD TX1012227 | 4,908 | 60 | 0 | 0 | 2.2 ppbbelow the action level |
| Harris County MUD 383 TX1013213 | 4,881 | 120 | 3 | 0 | 1.0 ppbbelow the action level |
| Kleinwood MUD TX1010440 | 4,872 | 0 | 0 | 1 | 4.3 ppbbelow the action level |
| Harris County MUD 104 TX1011534 | 4,854 | 120 | 2 | 0 | 10.9 ppbbelow the action level |
| Louetta North PUD TX1011870 | 4,848 | 120 | 3 | 0 | 0.8 ppbbelow the action level |
| Harris County MUD 221 TX1012972 | 4,839 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County WCID 92 TX1010124 | 4,752 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 50 TX1010719 | 4,743 | 180 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 360 TX1012897 | 4,707 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 106 TX1013160 | 4,668 | 60 | 0 | 0 | 0.8 ppbbelow the action level |
| Reid Road MUD 2 TX1011928 | 4,662 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 185 TX1011914 | 4,617 | 120 | 6 | 0 | 1.9 ppbbelow the action level |
| Fountainhead MUD TX1010435 | 4,614 | 240 | 3 | 0 | 1.4 ppbbelow the action level |
| Sunbelt FWSD Woodland Oaks Subdivision TX1010758 | 4,578 | 180 | 2 | 0 | 0.8 ppbbelow the action level |
| Harris County MUD 130 TX1012097 | 4,572 | 120 | 4 | 0 | 1.1 ppbbelow the action level |
| Chelford One MUD TX1010767 | 4,557 | 60 | 0 | 0 | 1.3 ppbbelow the action level |
| Northwest Harris County MUD 23 TX1011746 | 4,470 | 60 | 0 | 0 | 1 ppbbelow the action level |
| Harris County MUD 365 TX1013009 | 4,461 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 370 TX1013113 | 4,452 | 120 | 3 | 0 | 1.8 ppbbelow the action level |
| Clay Road MUD TX1011681 | 4,443 | 120 | 3 | 0 | 1.5 ppbbelow the action level |
| Harris County MUD 69 TX1010600 | 4,422 | 60 | 0 | 0 | 3.8 ppbbelow the action level |
| Harris County MUD 397 TX1013295 | 4,413 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 172 TX1012970 | 4,404 | 240 | 4 | 0 | 0.5 ppbbelow the action level |
| Kings Manor MUD TX1012865 | 4,377 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 322 TX1012542 | 4,266 | 60 | 0 | 0 | 2.2 ppbbelow the action level |
| Harris County FWSD 47 TX1010260 | 4,250 | 120 | 3 | 0 | 0 ppbbelow the action level |
| City of Spring Valley Village TX1010214 | 4,229 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Spring Meadows MUD TX1013261 | 4,200 | 120 | 4 | 0 | 1.9 ppbbelow the action level |
| West Memorial MUD TX1010540 | 4,182 | 120 | 0 | 0 | 0.8 ppbbelow the action level |
| Harris County MUD 304 TX1012941 | 4,158 | 60 | 0 | 0 | 4.2 ppbbelow the action level |
| Champions MUD TX1010233 | 4,098 | 60 | 4 | 0 | 3.3 ppbbelow the action level |
| Harris County MUD 18 Heatherwood Hunters TX1010512 | 4,083 | 240 | 2 | 0 | 0 ppbbelow the action level |
| Harris County MUD 342 TX1012973 | 4,035 | 60 | 0 | 0 | 0.7 ppbbelow the action level |
| Harris County MUD 186 TX1012214 | 4,005 | 120 | 4 | 0 | 1.8 ppbbelow the action level |
| Harris County MUD 183 TX1011824 | 3,981 | 120 | 4 | 0 | 2.1 ppbbelow the action level |
| Cypress Klein Utility District Wimbleton TX1010431 | 3,960 | 120 | 0 | 0 | 2.9 ppbbelow the action level |
| Harris County MUD 6 Carriage Lane TX1010496 | 3,936 | 120 | 5 | 0 | 2.2 ppbbelow the action level |
| Southern Water TX1010012 | 3,933 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County WCID 50 El Lago TX1010241 | 3,924 | 0 | 0 | 4 | 3.7 ppbbelow the action level |
| Cypress Forest PUD TX1010919 | 3,912 | 120 | 3 | 0 | 2.6 ppbbelow the action level |
| Westlake MUD 1 TX1010635 | 3,909 | 60 | 0 | 0 | 0.9 ppbbelow the action level |
| Northgate Crossing MUD 1 TX1013077 | 3,906 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 173 TX1012971 | 3,894 | 120 | 3 | 0 | 1.3 ppbbelow the action level |
| Harris County MUD 345 TX1012768 | 3,855 | 60 | 0 | 0 | 1.2 ppbbelow the action level |
| City of Bunker Hill Village TX1010106 | 3,771 | 240 | 3 | 0 | 1.2 ppbbelow the action level |
| Northgate Crossing MUD 2 TX1013078 | 3,753 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 401 TX1013289 | 3,750 | 60 | 0 | 0 | 1.5 ppbbelow the action level |
| Postwood MUD TX1010631 | 3,747 | 30 | 0 | 0 | 0.7 ppbbelow the action level |
| Brittmoore Utility TX1011014 | 3,732 | 120 | 0 | 0 | 1 ppbbelow the action level |
| Encanto Real Utility District TX1010687 | 3,717 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Fry Road MUD TX1011679 | 3,711 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 361 TX1013123 | 3,705 | 60 | 1 | 0 | 1.4 ppbbelow the action level |
| Northwest Freeway MUD TX1011256 | 3,678 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 11 TX1010426 | 3,645 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 208 TX1012419 | 3,642 | 120 | 3 | 0 | 2.9 ppbbelow the action level |
| Harris County WCID 116 TX1010507 | 3,627 | 60 | 4 | 0 | 0 ppbbelow the action level |
| El Dorado Utility District TX1010471 | 3,591 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 264 TX1012330 | 3,573 | 120 | 3 | 0 | 0.9 ppbbelow the action level |
| Harris County MUD 281 TX1013178 | 3,573 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 149 TX1011296 | 3,543 | 60 | 2 | 0 | 7.8 ppbbelow the action level |
| Harris County MUD 287 TX1013385 | 3,510 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Klein PUD TX1011143 | 3,504 | 59 | 3 | 0 | 2.1 ppbbelow the action level |
| Harris County MUD 257 TX1012985 | 3,501 | 120 | 4 | 0 | 3 ppbbelow the action level |
| Harris County WCID 132 TX1010413 | 3,501 | 240 | 3 | 0 | 4.6 ppbbelow the action level |
| Harris County UD 15 TX1011778 | 3,489 | 60 | 0 | 0 | 4.2 ppbbelow the action level |
| Harris County MUD 412 TX1013354 | 3,480 | 120 | 4 | 0 | 0.8 ppbbelow the action level |
| Oakmont PUD TX1012981 | 3,450 | 60 | 0 | 0 | 0.6 ppbbelow the action level |
| West Harris County MUD 6 TX1011258 | 3,435 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Northwest Harris County MUD 20 TX1011998 | 3,429 | 60 | 1 | 0 | 1.6 ppbbelow the action level |
| Harris County MUD 8 TX1010712 | 3,271 | 120 | 6 | 0 | 2.8 ppbbelow the action level |
| Harris County MUD 144 TX1010923 | 3,219 | 0 | 0 | 1 | 1.0 ppbbelow the action level |
| Harris County MUD 23 TX1010649 | 3,170 | 240 | 3 | 0 | 1.8 ppbbelow the action level |
| Harris County WCID 161 TX1013612 | 3,129 | 113 | 5 | 0 | 0 ppbbelow the action level |
| Baybrook MUD 1 TX1012698 | 3,087 | 0 | 0 | 7 | 0 ppbbelow the action level |
| Northwest Harris County MUD 29 TX1012293 | 3,000 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Morton Road MUD TX1011685 | 2,817 | 0 | 0 | 8 | 0 ppbbelow the action level |
| Harris County FWSD 1a TX1010082 | 2,640 | 0 | 0 | 1 | 2.5 ppbbelow the action level |
| Spring West MUD TX1013017 | 2,639 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Greenwood Village TX1010011 | 2,514 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Candlelight Hills Subdivision TX1010532 | 2,265 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Harris County FWSD 6 TX1010768 | 2,229 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 61 TX1010721 | 2,016 | 60 | 0 | 0 | 3.6 ppbbelow the action level |
| Northeast Harris County MUD 1 Sheldon Ri TX1013448 | 1,788 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Country Terrace Subdivision TX1011260 | 1,677 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Southwest Harris County MUD 1 TX1011911 | 1,581 | 0 | 0 | 3 | 2.5 ppbbelow the action level |
| West Harris County MUD 1 TX1010925 | 1,581 | 60 | 0 | 0 | 1.0 ppbbelow the action level |
| North Forest MUD TX1010298 | 1,545 | 0 | 0 | 2 | 2.9 ppbbelow the action level |
| Lakes of Rosehill Water System TX1013050 | 1,239 | 120 | 5 | 0 | 1.5 ppbbelow the action level |
| Timberwilde Mh Subdivision TX1012367 | 1,233 | 0 | 0 | 1 | 4.0 ppbbelow the action level |
| Western Pines MHP TX1011714 | 1,170 | 60 | 1 | 0 | 0 ppbbelow the action level |
| City of Houston District 82 TX1011593 | 1,104 | 60 | 0 | 0 | 1.5 ppbbelow the action level |
| Royalwood MUD TX1010201 | 1,101 | 0 | 0 | 2 | 8.9 ppbbelow the action level |
| Cottage Gardens TX1013271 | 1,047 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Aldine Village Subdivision TX1010931 | 981 | 0 | 0 | 1 | 0 ppbbelow the action level |
| City of Hilshire Village TX1012987 | 945 | 0 | 0 | 1 | 4.1 ppbbelow the action level |
| Five Oaks Mobile Home Subdivision TX1011832 | 915 | 0 | 0 | 1 | 4.2 ppbbelow the action level |
| Sugarberry Place TX1013084 | 864 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Mount Houston Square TX1011957 | 836 | 56 | 0 | 0 | 0 ppbbelow the action level |
| El Dorado Mobile Home Community TX1010459 | 750 | 0 | 0 | 1 | 6 ppbbelow the action level |
| Reservoir Acres Subdivision TX1010197 | 738 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Harris County FWSD 1b TX1010590 | 672 | 0 | 0 | 3 | 0 ppbbelow the action level |
| P & B Water System TX1010681 | 660 | 0 | 0 | 1 | 0 ppbbelow the action level |
| West Houston MHC TX1010583 | 630 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Highland Ridge Subdivision TX1010157 | 591 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Royal Coach Mobile Home Village TX1010520 | 582 | 0 | 0 | 1 | 1.2 ppbbelow the action level |
| Harris County FWSD 45 TX1010545 | 504 | 0 | 0 | 1 | 1.5 ppbbelow the action level |
| Kingmont Mobile Home Park TX1012892 | 420 | 0 | 0 | 1 | 0 ppbbelow the action level |
| H O E WSC TX1011101 | 410 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Oak Hill Estates TX1013045 | 402 | 0 | 0 | 1 | 0.3 ppbbelow the action level |
| Stonetown Royal Coach Trails MHP TX1010339 | 375 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Willow Oaks Mobile Home Subdivision TX1011812 | 375 | 0 | 0 | 1 | 1.2 ppbbelow the action level |
| Forest Manor Subdivision TX1010264 | 300 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Bayou Forest Village Mobile Home Park TX1011995 | 297 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Cedar Bayou Park TX1010112 | 294 | 0 | 0 | 1 | 0 ppbbelow the action level |
| R&k Weiman MHP TX1012019 | 279 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Tidwell Forest New Subdivision TX1013247 | 225 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Cedar Oaks Mobile Home Community TX1011556 | 207 | 0 | 0 | 1 | 1.2 ppbbelow the action level |
| Walraven Subdivision TX1013195 | 198 | 0 | 0 | 4 | 0.3 ppbbelow the action level |
| Chapmans MHP TX1010811 | 195 | 0 | 0 | 1 | 4.5 ppbbelow the action level |
| Timberdale Mobile Home Subdivision TX1011810 | 183 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Treichel Woods Estates TX1012397 | 174 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Sralla Mobile Home Park TX1011925 | 165 | 0 | 0 | 1 | 1 ppbbelow the action level |
| Red Oak Terrace TX1010916 | 159 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Kickapoo Farms Subdivision TX1011766 | 156 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Amberwood Subdivision TX1011920 | 150 | 0 | 0 | 1 | 0.6 ppbbelow the action level |
| Trailwood Subdivision TX1011521 | 147 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Sjolander Road Mobile Home Park TX1010788 | 146 | 0 | 0 | 2 | 4.6 ppbbelow the action level |
| Cypress Pass Estates TX1011552 | 144 | 0 | 0 | 1 | 0 ppbbelow the action level |
| North Point Villa TX1010832 | 144 | 0 | 0 | 1 | 1.6 ppbbelow the action level |
| Cypress Crossing TX1010629 | 138 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Aldine Gardens Mobile Home Park TX1010825 | 128 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Corbello Water System TX1010077 | 126 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Deer Trail Mobile Home Park TX1010686 | 126 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Harris County Leadership Academy TX1013205 | 125 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Hamilton Estates Water System TX1012916 | 123 | 0 | 0 | 2 | 4.5 ppbbelow the action level |
| Binford Place Subdivision TX1011551 | 120 | 0 | 0 | 1 | 1.9 ppbbelow the action level |
| Mcfarland Village Apartments TX1012982 | 120 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Boudreaux Gardens TX1011084 | 108 | 0 | 0 | 2 | 0.4 ppbbelow the action level |
| Pine Oak Forest Water TX1010751 | 105 | 0 | 0 | 1 | 3.9 ppbbelow the action level |
| Roving Meadows Water System TX1012260 | 105 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Renes Water System TX1010578 | 100 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Grant Road Estates Mobile Home Sub TX1011996 | 99 | 0 | 0 | 1 | 3.5 ppbbelow the action level |
| Kitzwood Subdivision TX1011536 | 99 | 0 | 0 | 3 | 0.6 ppbbelow the action level |
| Reed Estates Water System TX1010945 | 96 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Bluebonnet Mobile Home Park TX1010691 | 93 | 0 | 0 | 1 | 0.3 ppbbelow the action level |
| Padok Timbers Subdivision Ws TX1012130 | 92 | 0 | 0 | 1 | 3.8 ppbbelow the action level |
| Silverwoods Subdivision TX1010877 | 90 | 0 | 0 | 1 | 0.7 ppbbelow the action level |
| Zam Zam Water Supply TX1011747 | 87 | 0 | 0 | 1 | 2 ppbbelow the action level |
| Sellers Estates Mobile Home Comm TX1011459 | 85 | 0 | 0 | 1 | 0.2 ppbbelow the action level |
| Villa Utilities TX1011183 | 85 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Fairway Mobile Home Village TX1010795 | 84 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Cypress Brook Estates TX1010354 | 81 | 0 | 0 | 3 | 0 ppbbelow the action level |
| Cna Plaza Apartments TX1010689 | 80 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Sunset Mobile Home Park 2 TX1011972 | 78 | 0 | 0 | 1 | 0.3 ppbbelow the action level |
| La Casita Homes II TX1010648 | 75 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Lazy Acres Mobile Home Park TX1013249 | 75 | 0 | 0 | 1 | 4.9 ppbbelow the action level |
| Lone Willow MHP West TX1010663 | 75 | 0 | 0 | 4 | 0 ppbbelow the action level |
| Coe Industrial Park TX1011845 | 72 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Country Living Mobile Home Park TX1011638 | 72 | 0 | 0 | 1 | 0 ppbbelow the action level |
| O Aces MHP TX1011553 | 72 | 0 | 0 | 1 | 0.3 ppbbelow the action level |
| Tallows Mobile Home Park TX1010863 | 72 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Harris County MUD 25 Brook Hollow West S TX1010422 | 69 | 0 | 0 | 8 | 2.3 ppbbelow the action level |
| Satsuma Park Villa Mobile Home Park TX1010763 | 66 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Carol Norra Mobile Home Park TX1011926 | 63 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Peek Road Mobile Home Park TX1012861 | 63 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Houston Suburban Heights MHP TX1011515 | 60 | 0 | 0 | 5 | 1.3 ppbbelow the action level |
| Timber Creek Estates TX1013239 | 60 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Estates Water Corp TX1010675 | 58 | 0 | 0 | 1 | 0.9 ppbbelow the action level |
| Delynn Water System TX1010469 | 55 | 0 | 0 | 2 | 5.3 ppbbelow the action level |
| K Lake Terrace TX1012710 | 54 | 0 | 0 | 1 | 4.5 ppbbelow the action level |
| Balaban Apartments 2 TX1011028 | 50 | 0 | 0 | 2 | 0 ppbbelow the action level |
| Wheat Meadow Mobile Home Park Section I TX1010628 | 48 | 0 | 0 | 1 | 0 ppbbelow the action level |
| K Estates Water System TX1012868 | 45 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Northwoods Mobile Home Park TX1011956 | 45 | 0 | 0 | 2 | 0.6 ppbbelow the action level |
| Sunset Mobile Home Park 1 TX1011984 | 45 | 0 | 0 | 1 | 1.6 ppbbelow the action level |
| Barkaloo Homeowners Association TX1012240 | 42 | 0 | 0 | 1 | 1 ppbbelow the action level |
| House Corral Street Water System TX1012904 | 42 | 0 | 0 | 1 | 2.8 ppbbelow the action level |
| Tepatitlan Mobile Home Park TX1010667 | 42 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Estates of Holly Lakes TX1012794 | 33 | 0 | 0 | 1 | 4.3 ppbbelow the action level |
| Harris County MUD 489 TX1013628 | 10,476 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| West Park MUD TX1011930 | 8,106 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Harris County MUD 504 TX1013522 | 7,242 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Harris County MUD 449 TX1013372 | 7,179 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 433 TX1013350 | 6,651 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 400 - East TX1013416 | 6,066 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Harris County MUD 457 TX1013576 | 5,967 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 319 TX1013563 | 5,751 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Northwest Harris County MUD 19 TX1011927 | 5,535 | 0 | 0 | 0 | 4.1 ppbbelow the action level |
| Harris County MUD 502 TX1013494 | 5,487 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Rolling Creek Utility District TX1012877 | 5,388 | 0 | 0 | 0 | 1.9 ppbbelow the action level |
| Harris County MUD 432 TX1013378 | 4,782 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 501 TX1013403 | 4,740 | 0 | 0 | 0 | 1.2 ppbbelow the action level |
| Harris County MUD 344 TX1012974 | 4,518 | 0 | 0 | 0 | 2.4 ppbbelow the action level |
| Harris County MUD 284 TX1013114 | 4,506 | 0 | 0 | 0 | 5 ppbbelow the action level |
| Woodcreek MUD TX1011237 | 4,464 | 0 | 0 | 0 | 3.9 ppbbelow the action level |
| Harris County MUD 166 TX1013181 | 4,239 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Harris County MUD 536 TX1013515 | 4,188 | 0 | 0 | 0 | 0.1 ppbbelow the action level |
| Harris County MUD 423 TX1013691 | 4,044 | 0 | 0 | 0 | 1.4 ppbbelow the action level |
| Bauer Ranch Subdivision TX1013526 | 3,990 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 534 TX1013716 | 3,822 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Northwest Harris County MUD 30 TX1012951 | 3,804 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Harris County MUD 191 TX1012362 | 3,729 | 0 | 0 | 0 | 1.8 ppbbelow the action level |
| Northwest Harris County MUD 36 TX1012848 | 3,648 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 216 TX1012577 | 3,627 | 0 | 0 | 0 | 0 ppbbelow the action level |
| West Harris County MUD 5 TX1013356 | 3,591 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 62 TX1012285 | 3,519 | 0 | 0 | 0 | 3.5 ppbbelow the action level |
| Pine Village PUD TX1010901 | 3,498 | 0 | 0 | 0 | 1.2 ppbbelow the action level |
| Harris County MUD 249 TX1013135 | 3,420 | 0 | 0 | 0 | 2.0 ppbbelow the action level |
| Grant Road PUD TX1011991 | 3,393 | 0 | 0 | 0 | 2 ppbbelow the action level |
| West Harris County MUD 17 TX1012238 | 3,354 | 0 | 0 | 0 | 1.4 ppbbelow the action level |
| Harris County MUD 558 TX1013698 | 3,300 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 282 TX1013375 | 3,237 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sunbelt FWSD Northline Terrace TX1010117 | 3,225 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| Harris County MUD 136 TX1010599 | 3,201 | 0 | 0 | 0 | 4.0 ppbbelow the action level |
| Harris County MUD 396 TX1013338 | 3,201 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| Harris County WCID 136 TX1010355 | 3,192 | 0 | 0 | 0 | 2.4 ppbbelow the action level |
| Northwest Harris County MUD 22 TX1011745 | 3,156 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Harris County WCID Fondren Road TX1010249 | 3,144 | 0 | 0 | 0 | 3.1 ppbbelow the action level |
| Terranova West MUD TX1011226 | 3,120 | 0 | 0 | 0 | 1.2 ppbbelow the action level |
| The Commons Water Supply TX1012978 | 3,018 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 147 TX1011243 | 3,003 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County WCID 91 TX1010063 | 3,000 | 0 | 0 | 0 | 4.4 ppbbelow the action level |
| Cypress Creek Utility District TX1010430 | 2,988 | 0 | 0 | 0 | 14.5 ppbbelow the action level |
| Green Trails MUD TX1011839 | 2,982 | 0 | 0 | 0 | 3.7 ppbbelow the action level |
| Harris County MUD 399 TX1013346 | 2,967 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| Harris County MUD 480 TX1013400 | 2,964 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Forest Hills MUD TX1011252 | 2,955 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sunbelt FWSD Heather Glen Subdivision TX1010419 | 2,943 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| Harris County MUD 202 TX1012356 | 2,940 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| Harris County MUD 280 TX1013063 | 2,898 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 434 TX1013373 | 2,859 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Rankin Road West MUD TX1012354 | 2,838 | 0 | 0 | 0 | 1.4 ppbbelow the action level |
| Harris County MUD 155 TX1012351 | 2,829 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Harris County MUD 552 TX1013843 | 2,814 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| North Belt Utility District TX1011737 | 2,775 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Timberlake Improvement District TX1010447 | 2,775 | 0 | 0 | 0 | 3.3 ppbbelow the action level |
| Harris County UD 14 TX1011781 | 2,769 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Northwest Harris County MUD 16 TX1011603 | 2,742 | 0 | 0 | 0 | 1.9 ppbbelow the action level |
| Heron Lakes Estates TX1013089 | 2,712 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Fountainview Subdivision TX1010127 | 2,703 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| West Harris County MUD 14 TX1012002 | 2,688 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 389 TX1013265 | 2,676 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Harris County MUD 162 TX1011612 | 2,661 | 0 | 0 | 0 | 2.4 ppbbelow the action level |
| Harris County MUD 372 TX1013141 | 2,619 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Blue Bell Manor Subdivision TX1010647 | 2,607 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 542 TX1013573 | 2,592 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 371 TX1013107 | 2,577 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Bammel Utility District TX1010365 | 2,550 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 215 TX1012812 | 2,541 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 217 TX1011983 | 2,538 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| White Oak Bend MUD TX1011238 | 2,520 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Castlewood MUD TX1011833 | 2,505 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Northwest Harris County MUD 21 TX1011744 | 2,493 | 0 | 0 | 0 | 1.4 ppbbelow the action level |
| Spring Creek Forest PUD TX1010390 | 2,472 | 0 | 0 | 0 | 4.3 ppbbelow the action level |
| Harris County Improvement District 14 TX1013757 | 2,469 | 0 | 0 | 0 | 0 ppbbelow the action level |
| City of Southside Place TX1010023 | 2,457 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Beechnut MUD TX1012082 | 2,451 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Inverness Forest Improvement District TX1010172 | 2,448 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Harris County MUD 341 TX1012917 | 2,421 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Harris County MUD 531 TX1013531 | 2,421 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Rolling Fork PUD TX1010357 | 2,397 | 0 | 0 | 0 | 3 ppbbelow the action level |
| Harris County WCID 99 TX1010684 | 2,343 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Timbercrest Village TX1011973 | 2,337 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Shasla PUD TX1010388 | 2,310 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| Harris County MUD 422 TX1013632 | 2,307 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| Harris County MUD 44 TX1010718 | 2,301 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 58 TX1011704 | 2,289 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Kirkmont MUD TX1010439 | 2,277 | 0 | 0 | 0 | 3.4 ppbbelow the action level |
| Northwest Harris County MUD 6 TX1011008 | 2,256 | 0 | 0 | 0 | 4.1 ppbbelow the action level |
| Harris County FWSD 27 TX1010261 | 2,190 | 0 | 0 | 0 | 1.3 ppbbelow the action level |
| Nitsch & Son Utility TX1010145 | 2,190 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 465 TX1013674 | 2,168 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Harris County WCID 70 TX1010244 | 2,112 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 156 TX1013327 | 2,082 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 248 TX1013306 | 2,076 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Harris County MUD 530 TX1013530 | 2,034 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 540 TX1013706 | 2,022 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County FWSD 58 TX1010209 | 1,968 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 494 TX1013511 | 1,944 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 420 TX1013399 | 1,941 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| Memorial Hills Utility District TX1010279 | 1,929 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Harris County MUD 213-A TX1013695 | 1,926 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Beaumont Place TX1010098 | 1,917 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Northeast Harris County MUD 1 Edgewood V TX1013449 | 1,842 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Longhorn Town Utility District TX1012408 | 1,788 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Mary Francis Subdivision TX1010100 | 1,785 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 220 TX1013321 | 1,773 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Generation Park Management District TX1013387 | 1,687 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Bayer Water System TX1010212 | 1,638 | 0 | 0 | 0 | 1.0 ppbbelow the action level |
| Harris County MUD 559 TX1013762 | 1,629 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Lakes of Fairhaven TX1013288 | 1,623 | 0 | 0 | 0 | 4.0 ppbbelow the action level |
| Northwest Harris County MUD 28 TX1013258 | 1,605 | 0 | 0 | 0 | 0 ppbbelow the action level |
| West Harris County MUD 4 TX1011825 | 1,581 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Harris County MUD 205 TX1012704 | 1,560 | 0 | 0 | 0 | 0.4 ppbbelow the action level |
| City of Shoreacres TX1010207 | 1,493 | 0 | 0 | 0 | 0 ppbbelow the action level |
| City of Pasadena El Cary Estates TX1012281 | 1,470 | 0 | 0 | 0 | 2.0 ppbbelow the action level |
| Harris County MUD 36 TX1012000 | 1,464 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 261 TX1012866 | 1,452 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 275 TX1012496 | 1,428 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Harris County MUD 537 TX1013586 | 1,416 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sheldon Road MUD TX1010235 | 1,412 | 0 | 0 | 0 | 2.6 ppbbelow the action level |
| Louetta Road Utility District TX1010536 | 1,410 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Harris County MUD 490 TX1013721 | 1,293 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 421 TX1013376 | 1,269 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 551 TX1013688 | 1,269 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Northwest Harris County MUD 24 TX1012071 | 1,257 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County WCID 113 Enchanted Village TX1010274 | 1,233 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 255 TX1012766 | 1,185 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 122 TX1012391 | 1,158 | 0 | 0 | 0 | 2.6 ppbbelow the action level |
| Harris County MUD 500 TX1013390 | 1,158 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County WCID 156 TX1013147 | 1,116 | 0 | 0 | 0 | 1.0 ppbbelow the action level |
| Harris County MUD 570c TX1013800 | 1,113 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 316 TX1012804 | 1,083 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Luce Bayou PUD TX1010378 | 1,083 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Harris County MUD 547 TX1013827 | 1,074 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Baker Road MUD TX1012962 | 1,062 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Castlewood Subdivision TX1010111 | 1,053 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Pinewood Place Mobile Home Community TX1012154 | 1,050 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sequoia Improvement District TX1010205 | 1,038 | 0 | 0 | 0 | 2.1 ppbbelow the action level |
| Northwest Pines Mobile Home Community TX1011032 | 990 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Bammel Forest Utility TX1010096 | 984 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Meadowlake Estates TX1010287 | 984 | 0 | 0 | 0 | 0 ppbbelow the action level |
| West Montgomery TX1010670 | 975 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Classic Pines Subdivision TX1013144 | 960 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Colonial Hills TX1010116 | 942 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Westfield Garden Mobile Home Park TX1011947 | 942 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Katy Hockley Regional Water Plant TX1013681 | 936 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| Harris County MUD 250 TX1012350 | 930 | 0 | 0 | 0 | 1.4 ppbbelow the action level |
| Creekside Estates South TX1011647 | 921 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| North Belt Forest TX1011999 | 897 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 286 TX1012532 | 879 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Flagstone Water Plant TX1013708 | 876 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 539 TX1013784 | 870 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Maple Leaf Mobile Home Subdivision TX1011493 | 861 | 0 | 0 | 0 | 0 ppbbelow the action level |
| West Harris County MUD 15 TX1012001 | 834 | 0 | 0 | 0 | 2.4 ppbbelow the action level |
| Harris County MUD 576 TX1013742 | 822 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cypress Bend Subdivision TX1010119 | 819 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 503 TX1013768 | 819 | 0 | 0 | 0 | 1.0 ppbbelow the action level |
| Harris County MUD 321 TX1012913 | 807 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Northwood MUD 1 TX1013404 | 795 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Stable Gates TX1013103 | 747 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Rosehill Meadow Water Plant TX1013703 | 741 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Atascocita Village Mobile Home Park TX1010162 | 723 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Estates of Willow Creek TX1013262 | 714 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Fairway Crossing TX1013127 | 684 | 0 | 0 | 0 | 1.0 ppbbelow the action level |
| Sunbelt FWSD Oakglen Subdivision TX1010188 | 684 | 0 | 0 | 0 | 2.3 ppbbelow the action level |
| Western Homes Subdivision TX1010028 | 678 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 405 TX1013362 | 657 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Richey Road MUD TX1011929 | 651 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Spring Creek Valley Estates TX1010213 | 645 | 0 | 0 | 0 | 1.0 ppbbelow the action level |
| White Oak Manor Mobile Home Park TX1010322 | 630 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Hunter Place TX1013191 | 606 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Hooks Mobile Home Park TX1011713 | 585 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 578 TX1013764 | 576 | 0 | 0 | 0 | 9.4 ppbbelow the action level |
| Urban Acres Subdivision TX1010252 | 570 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Harris County MUD 569 TX1013806 | 549 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Mobile Home Estates TX1010288 | 549 | 0 | 0 | 0 | 2.4 ppbbelow the action level |
| Red Bud Water Plant TX1013817 | 501 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Orange Grove Water Supply TX1010870 | 498 | 0 | 0 | 0 | 0.4 ppbbelow the action level |
| Springmont Subdivision TX1010255 | 495 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Summer Lake Ranch TX1013187 | 489 | 0 | 0 | 0 | 2.0 ppbbelow the action level |
| Redwood Estates Mobile Home Park TX1010307 | 485 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| Harris County MUD 48 TX1010896 | 483 | 0 | 0 | 0 | 4.7 ppbbelow the action level |
| Canal Terrace Subdivision TX1010639 | 480 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Peek Road Utilities TX1011955 | 480 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Village of New Kentucky TX1012795 | 459 | 0 | 0 | 0 | 3.0 ppbbelow the action level |
| Country Club Greens TX1013189 | 456 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Stonetown Spring Oaks Mobile Home Park TX1012090 | 450 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cypress Fields Subdivision TX1011651 | 447 | 0 | 0 | 0 | 3.4 ppbbelow the action level |
| Tierra del Rey TX1013582 | 438 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Huffman Heights Subdivision TX1010700 | 435 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Ramblewood Utility & WSC TX1011528 | 429 | 0 | 0 | 0 | 2.4 ppbbelow the action level |
| Woodgate Mobile Home Village TX1011796 | 423 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 211 TX1012145 | 405 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Cypress Forest Water System TX1010120 | 396 | 0 | 0 | 0 | 3.2 ppbbelow the action level |
| Harris County MUD 233 TX1012498 | 390 | 0 | 0 | 0 | 4.4 ppbbelow the action level |
| Tower Oak Bend WSC TX1011981 | 390 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Ralston Acres Water Supply Corporation TX1010196 | 385 | 0 | 0 | 0 | 10.3 ppbbelow the action level |
| 2920 West Subdivision TX1012276 | 384 | 0 | 0 | 0 | 1.2 ppbbelow the action level |
| Atascocita Acres Subdivision TX1011687 | 381 | 0 | 0 | 0 | 0 ppbbelow the action level |
| City of Houston Belleau Woods TX1011594 | 381 | 0 | 0 | 0 | 4.8 ppbbelow the action level |
| Shaw Acres TX1013468 | 369 | 0 | 0 | 0 | 0.4 ppbbelow the action level |
| Provence Water System TX1013036 | 366 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Greenland Square Subdivision Ws TX1013055 | 357 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Spanish Cove PUD TX1010389 | 357 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Orchard Crossing Subdivision TX1012450 | 351 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Pin Oak Mobile Home Park TX1010826 | 345 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Heathergate Estates TX1011302 | 342 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Imperial Valley MHC TX1013153 | 342 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Powder Mill Estates TX1012986 | 342 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Van Manor Mobile Home Park TX1011433 | 333 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Bender Creek Apartments TX1010180 | 330 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Advanced RV Park TX1013374 | 327 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Greengate Acres Subdivision TX1010132 | 318 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Alice Acres Mobile Home Subdivision TX1011236 | 315 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Mading Lane TX1010517 | 312 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Brandywine Pines TX1011219 | 306 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lago Bello MUD 1a TX1013763 | 297 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lake Houston Storage TX1010737 | 294 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Rolling Oaks TX1011861 | 291 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Kirby Landing Community TX1013835 | 285 | 0 | 0 | 0 | 2.3 ppbbelow the action level |
| Sundown Mobile Home Park TX1010533 | 282 | 0 | 0 | 0 | 4 ppbbelow the action level |
| Cypress Creek Ranch TX1013296 | 276 | 0 | 0 | 0 | 0.3 ppbbelow the action level |
| Villas of Willowbrook TX1013599 | 276 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| City of Morgans Point TX1010087 | 275 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Enchanted Valley Estates WSC TX1010978 | 270 | 0 | 0 | 0 | 4.2 ppbbelow the action level |
| Harris County MUD 477 TX1013670 | 267 | 0 | 0 | 0 | 8 ppbbelow the action level |
| Woodloch MHP TX1010805 | 264 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Colony M H Subdivision Ws TX1011806 | 261 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Marks Glen Subdivision TX1011510 | 261 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Aldine Meadows TX1010092 | 255 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 493 TX1013790 | 255 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Bammel Oaks Estates 2 TX1010810 | 243 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Americasa at Cypress Meadows TX1013341 | 240 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Stonetown Windfern Oaks TX1010566 | 240 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Pitcairn WSC TX1010078 | 238 | 0 | 0 | 0 | 0.3 ppbbelow the action level |
| Harris County MUD 525 TX1013579 | 237 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Glenwood Mobile Home Subdivision TX1011492 | 234 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Huffman Hollow Apartments TX1013198 | 234 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Parkland Estates TX1010192 | 228 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Waterstone Estates TX1013389 | 225 | 0 | 0 | 0 | 3.0 ppbbelow the action level |
| Harris County MUD 358 TX1012969 | 222 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Tasfield TX1011865 | 222 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Longhorn Mobile Home Community TX1010587 | 220 | 0 | 0 | 0 | 3 ppbbelow the action level |
| Tall Pines Utility TX1010220 | 213 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Carby Mobile Home Park TX1011632 | 210 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Park Forest Water System TX1013041 | 210 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Apacheland Mobile Home Subdivision TX1010085 | 207 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| H-M-W SUD Oakwood Subdivision TX1013734 | 204 | 0 | 0 | 0 | 2.9 ppbbelow the action level |
| Los Pinos Subdivision TX1013733 | 204 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cedar Creek Forest Mobile Home Community TX1013200 | 195 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Acorn Village Mobile Home Park TX1012333 | 192 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Bauer Meadows TX1013797 | 190 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lincoln Square Subdivision PWS TX1013111 | 189 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Melrose MHP TX1010743 | 186 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Champion Lakes Estates Water Plant TX1013146 | 174 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Hunters Village Subdivision TX1013159 | 174 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| Oakwood Village Mobile Home Subdivision TX1011803 | 171 | 0 | 0 | 0 | 7.6 ppbbelow the action level |
| Cottonwood Park Water System TX1010283 | 168 | 0 | 0 | 0 | 0.3 ppbbelow the action level |
| Rio Villa WSC TX1011071 | 165 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Whisper Meadows TX1011708 | 165 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Tall Cedars Mobile Home Subdivision TX1010219 | 156 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Mcgee Place TX1012995 | 153 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Westgate Subdivision TX1010622 | 153 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Aldine Oaks MHP TX1010658 | 150 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Oakland Village Mobile Home Community TX1011049 | 150 | 0 | 0 | 0 | 2.1 ppbbelow the action level |
| Stetner Addition TX1010216 | 150 | 0 | 0 | 0 | 0.3 ppbbelow the action level |
| Telge Manor MHP TX1011939 | 150 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Chinquapin Preparatory School TX1011209 | 148 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cypress Place TX1010254 | 147 | 0 | 0 | 0 | 0.3 ppbbelow the action level |
| Waynewood Place Civic Club TX1011186 | 147 | 0 | 0 | 0 | 5.4 ppbbelow the action level |
| Berry Hill Estates TX1011860 | 144 | 0 | 0 | 0 | 2.0 ppbbelow the action level |
| Albury Manor Utility Company TX1012052 | 141 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Rocky Creek Estates TX1013393 | 138 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Winterhaven Subdivision TX1012015 | 138 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Bentwood Estates MHP TX1011828 | 135 | 0 | 0 | 0 | 3 ppbbelow the action level |
| Brandywine Oaks TX1010887 | 135 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Crickett Hill Estates TX1010947 | 132 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Oak Manor TX1011633 | 132 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Oaks of Rosehill TX1013066 | 132 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Telge Terrace Mobile Home Subdivision TX1011805 | 132 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Harris County MUD 538 TX1013640 | 126 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Swea Gardens Estates TX1010218 | 126 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Western Trails Subdivision TX1010230 | 126 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cypress Hill Subdivision TX1011792 | 123 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Spring Creek Forest TX1010334 | 123 | 0 | 0 | 0 | 3.2 ppbbelow the action level |
| Cypress Village Trailer & RV Park TX1010603 | 120 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Suburban Mobile Home Park 2 TX1010760 | 120 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Arcadia Court Community Association TX1013803 | 111 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lori Heights Mobile Home Subdivision TX1010514 | 111 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Ed Lou Mobile Home Park TX1011977 | 108 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Country Living Apartments TX1011501 | 105 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Twin Oaks MHP Harris TX1013058 | 105 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Aldine Forest TX1010410 | 102 | 0 | 0 | 0 | 4 ppbbelow the action level |
| Apache Mobile Home Park TX1010574 | 102 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cypresswood MHP TX1011112 | 96 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Highland Mobile Home Subdivision TX1010285 | 96 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Telge Jarvis Water Plant TX1013638 | 90 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Highland Meadows Mobile Home Park TX1010914 | 87 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Boulais Mobile Home Park TX1012741 | 84 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Fairview Mobile Home Community TX1011268 | 84 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cornerstone Mobile Home Community TX1013193 | 81 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cypress Gardens Mobile Home Subdivision TX1012048 | 81 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Grantwoods Water Supply Corporation TX1010130 | 78 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Riverton Ranch TX1013366 | 78 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Fairview Gardens MHP TX1010821 | 75 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Homestead Oaks Mobile Home Comm TX1011734 | 75 | 0 | 0 | 0 | 1.3 ppbbelow the action level |
| North Woods Estates TX1010915 | 75 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Westfield Meadows TX1010584 | 72 | 0 | 0 | 0 | 5 ppbbelow the action level |
| Boys & Girls Country TX1011120 | 69 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Miller MHP TX1012166 | 66 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Azalea Estates Mobile Home Commun TX1011253 | 60 | 0 | 0 | 0 | 2.6 ppbbelow the action level |
| Cedar Bayou Estates TX1012174 | 60 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Granger Subdivision TX1013325 | 60 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Hydies Crossing TX1013180 | 60 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Mesquite MHP TX1013245 | 60 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Peakes Park TX1010651 | 57 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Four Seasons MHP TX1013088 | 54 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Rollan Heights Subdivision TX1010640 | 53 | 0 | 0 | 0 | 1.8 ppbbelow the action level |
| Dogwood Tree Water System TX1010927 | 48 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Quailwood Water System TX1011475 | 48 | 0 | 0 | 0 | 0.3 ppbbelow the action level |
| Wheat Meadow Mobile Home Park Section II TX1010613 | 48 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Harris County MUD 565 TX1013663 | 45 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Lucky Homes RV Park TX1013861 | 45 | 0 | 0 | 0 | 2.1 ppbbelow the action level |
| Bergville Addition TX1010099 | 42 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Dorsett Place TX1010122 | 42 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Kingsland Estates WSC TX1011567 | 42 | 0 | 0 | 0 | 2.4 ppbbelow the action level |
| Bammel Oaks Estates 1 TX1010809 | 36 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harris County MUD 491 TX1013727 | 25 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Meadows at Cypress Creek Water Plant TX1013567 | 25 | 0 | 0 | 0 | 0.3 ppbbelow the action level |
| North Channel Water Authority TX1013092 | 0 | 0 | 0 | 1 | not reported |
| Harris County MUD 572 TX1013895 | 1,698 | 0 | 0 | 0 | not reported |
| Binford Creek TX1013779 | 750 | 0 | 0 | 0 | not reported |
| Green Acres MHP TX1013878 | 712 | 0 | 0 | 0 | not reported |
| Harris County MUD 458 TX1013644 | 501 | 0 | 0 | 0 | not reported |
| Harris County MUD 532 TX1013792 | 342 | 0 | 0 | 0 | not reported |
| Harris County MUD 544 TX1013814 | 264 | 0 | 0 | 0 | not reported |
| Perenfra Tx 586 TX1013826 | 180 | 0 | 0 | 0 | not reported |
| Bauer Century Water Plant TX1013794 | 144 | 0 | 0 | 0 | not reported |
| Harris County MUD 514 TX1013815 | 129 | 0 | 0 | 0 | not reported |
| Harris County MUD 171 TX1013540 | 87 | 0 | 0 | 0 | not reported |
| Harris County MUD 560 TX1013765 | 54 | 0 | 0 | 0 | not reported |
| East Houston at Piney Woods MHP TX1013785 | 25 | 0 | 0 | 0 | not reported |
| Hooks Airport South End TX1012272 | 25 | 0 | 0 | 0 | not reported |
| Aurora Water Plant TX1013770 | 0 | 0 | 0 | 0 | not reported |
| Baytown Area Water Authority TX1011742 | 0 | 0 | 0 | 0 | not reported |
| Cypress Green Regional Water Plant TX1013746 | 0 | 0 | 0 | 0 | not reported |
| Harris County Improvement District 13 TX1013611 | 0 | 0 | 0 | 0 | not reported |
| Harris County Indian Springs TX1013853 | 0 | 0 | 0 | 0 | not reported |
| Harris County MUD 387 TX1013360 | 0 | 0 | 0 | 0 | not reported |
| Harris County MUD 418 TX1013329 | 0 | 0 | 0 | 0 | not reported |
| Harris County MUD 478 Water Plant 1 TX1013866 | 0 | 0 | 0 | 0 | not reported |
| Harris County MUD 570d TX1013839 | 0 | 0 | 0 | 0 | not reported |
| North Harris County Regional Water Autho TX1013298 | 0 | 0 | 0 | 0 | not reported |
| West Harris County Regional Water Author TX1013303 | 0 | 0 | 0 | 0 | not reported |
Shaded rows report lead at or above the 15 ppb action level in their latest monitoring period. EPA sets that level for the value 9 in 10 sampled homes fall at or below; reaching it requires the utility to act, and it is not a measurement of any single tap. One system in this table is at or above it. What an action level means
USGS · Monitoring stations
The water, more recently.
Available station readings in Harris County, Texas. Each measurement keeps its time, unit and original source.
These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.
Recent observations load when this section comes into view.
How these readings update
We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.
Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.
Your next step
Water testing, reports & local help.
Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.
Official national directories
Water testing
Find your state’s private-well program
EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.
Water testing
Find a certified drinking-water laboratory
Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.
Public records
Find your utility’s Consumer Confidence Report
EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.
Public records
Explore USGS water observations
Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.
A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.
Understand water testing and laboratory reportsResource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction
Explore your area
Local coverage in Harris County
132ZIP areas in this overview
Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.
Towns and communities
- Aldine
- Atascocita
- Barrett
- Baytown
- Bellaire
- Channelview
- Deer Park
- Galena Park
- Highlands
- Houston
- Katy
- La Porte
- Mission Bend
- Pasadena
- Seabrook
- Sheldon
- South Houston
- Spring
- The Woodlands
- Tomball
- Webster
- West University Place
View ZIP areas and understand coverage
- 77002Houston
- 77003Houston
- 77004Houston
- 77005West University Place
- 77006Houston
- 77007Houston
- 77008Houston
- 77009Houston
- 77010Houston
- 77011Houston
- 77012Houston
- 77013Houston
- 77014Houston
- 77015Houston
- 77016Houston
- 77017Houston
- 77018Houston
- 77019Houston
- 77020Houston
- 77021Houston
- 77022Houston
- 77023Houston
- 77024Houston
- 77025Houston
- 77026Houston
- 77027Houston
- 77028Houston
- 77029Houston
- 77030Houston
- 77031Houston
- 77032Houston
- 77033Houston
- 77034Houston
- 77035Houston
- 77036Houston
- 77037Houston
- 77038Houston
- 77039Aldine
- 77040Houston
- 77041Houston
- 77042Houston
- 77043Houston
- 77044Houston
- 77045Houston
- 77046Houston
- 77047Houston
- 77048Houston
- 77049Sheldon
- 77050Houston
- 77051Houston
- 77054Houston
- 77055Houston
- 77056Houston
- 77057Houston
- 77058Houston
- 77059Houston
- 77060Houston
- 77061Houston
- 77062Houston
- 77063Houston
- 77064Houston
- 77065Houston
- 77066Houston
- 77067Houston
- 77068Houston
- 77069Houston
- 77070Houston
- 77071Houston
- 77072Houston
- 77073Houston
- 77074Houston
- 77075Houston
- 77076Houston
- 77077Houston
- 77078Houston
- 77079Houston
- 77080Houston
- 77081Houston
- 77082Houston
- 77083Mission Bend
- 77084Houston
- 77085Houston
- 77086Houston
- 77087Houston
- 77088Houston
- 77089Houston
- 77090Houston
- 77091Houston
- 77092Houston
- 77093Houston
- 77094Houston
- 77095Houston
- 77096Houston
- 77098Houston
- 77099Houston
- 77204Houston
- 77336Houston
- 77338Houston
- 77339Houston
- 77345Houston
- 77346Atascocita
- 77373Spring
- 77375Tomball
- 77377Tomball
- 77379Houston
- 77388Houston
- 77389The Woodlands
- 77396Houston
- 77401Bellaire
- 77429Houston
- 77433Houston
- 77447Houston
- 77449Houston
- 77450Houston
- 77493Katy
- 77502Pasadena
- 77503Pasadena
- 77504Pasadena
- 77505Pasadena
- 77506Pasadena
- 77507Pasadena
- 77520Baytown
- 77521Baytown
- 77530Channelview
- 77532Barrett
- 77536Deer Park
- 77547Galena Park
- 77562Highlands
- 77571La Porte
- 77586Seabrook
- 77587South Houston
- 77598Webster
These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.
Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.
Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.