County · Texas
Harris County, Texas: drinking water records
This overview covers 132 ZIP codes and 688 community water systems in Harris County. It also stands in for 8 ZIP codes whose utility has too little EPA data for a page of its own.
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 with the most complete records
| 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 ppb |
| City of Deer Park TX1010007 | 34,495 | 120 | 6 | 1 | 0 ppb |
| Harris County MUD 24 TX1010572 | 14,796 | 300 | 3 | 1 | 2.4 ppb |
| City of Galena Park TX1010009 | 10,487 | 240 | 6 | 1 | 1.7 ppb |
| Mission Bend MUD 2 TX1011826 | 10,155 | 180 | 0 | 1 | 1.1 ppb |
| Trail of the Lakes MUD TX1010617 | 9,480 | 120 | 0 | 6 | 1 ppb |
| Rice University TX1010908 | 8,415 | 240 | 5 | 4 | 2.4 ppb |
| City of Jersey Village TX1010016 | 7,792 | 360 | 5 | 1 | 4.6 ppb |
| Harris County MUD 238 TX1012361 | 7,773 | 240 | 3 | 6 | 0.5 ppb |
| Parkway Utility District TX1010750 | 7,323 | 240 | 4 | 1 | 1.1 ppb |
| Harris County MUD 196 TX1013002 | 7,026 | 240 | 5 | 1 | 0 ppb |
| West Harris County MUD 10 TX1012068 | 6,697 | 120 | 0 | 1 | 0 ppb |
| West Harris County MUD 9 TX1011798 | 5,961 | 60 | 0 | 4 | 0 ppb |
| Harris County MUD 46 TX1010903 | 5,418 | 60 | 0 | 1 | 0.5 ppb |
| Bilma PUD TX1011872 | 5,397 | 240 | 4 | 1 | 5.4 ppb |
| Mayde Creek MUD TX1011689 | 5,301 | 60 | 3 | 1 | 2.2 ppb |
| Harris County WCID 114 TX1010317 | 5,160 | 210 | 3 | 4 | 4.5 ppb |
| Harris County MUD 119 TX1010626 | 4,758 | 120 | 1 | 1 | 1.2 ppb |
| Renn Road MUD TX1011834 | 4,464 | 60 | 0 | 1 | 1.8 ppb |
| Cypresswood Utility District TX1010432 | 4,305 | 360 | 3 | 1 | 0 ppb |
| City of Pasadena TX1010293 | 152,000 | 716 | 7 | 0 | 3.7 ppb |
| Clear Lake City Water Authority TX1010056 | 89,702 | 540 | 8 | 0 | 1.2 ppb |
| City of Baytown TX1010003 | 86,004 | 240 | 7 | 0 | 2.1 ppb |
| City of Houston UD 5 - Kingwood TX1010348 | 80,073 | 360 | 0 | 0 | 1.9 ppb |
| Harris County MUD 165 TX1012187 | 40,503 | 300 | 2 | 0 | 1.3 ppb |
ZIP reports in Harris County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 77050, 77064, 77069, 77075, 77094, 77338, 77375, 77377.
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. Page generated 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.