County · Washington
Grant County, Washington: drinking water records
Explore EPA records for 81 community water systems across 14 ZIP codes in Grant County, then find water-testing resources and available recent monitoring-station readings.
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 5 of the 81 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.
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 81 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 |
|---|---|---|---|---|---|
| Mattawa City of WA5352000 | 5,370 | 60 | 0 | 1 | 0 ppbbelow the action level |
| Warden City of WA5392850 | 4,674 | 240 | 0 | 1 | 0 ppbbelow the action level |
| Moses Lake City of WA5356300 | 32,428 | 1,080 | 5 | 0 | 3.2 ppbbelow the action level |
| Ephrata Water Department WA5323650 | 8,718 | 300 | 0 | 0 | 0 ppbbelow the action level |
| Quincy Water Department City of WA5370450 | 8,415 | 300 | 0 | 0 | 2.5 ppbbelow the action level |
| Pelican Point By Cascadia LLC WA5366800 | 1,357 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Weiler-Martin Tracts Water Assn WA5394110 | 1,163 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Parker Spring Acres Water Assoc WA5322881 | 255 | 0 | 0 | 10 | 0.7 ppbbelow the action level |
| Hartline Water System WA5331500 | 249 | 0 | 0 | 1 | 3 ppbbelow the action level |
| Grove Terrace MHP Two LLC WA5308520 | 220 | 0 | 0 | 2 | 0 ppbbelow the action level |
| Golden Valley Water Assn WA5328400 | 138 | 0 | 0 | 8 | 0 ppbbelow the action level |
| Beverly Water District WA5306350 | 120 | 0 | 0 | 2 | 0 ppbbelow the action level |
| T-11 Farmworker Housing WA53AC293 | 99 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Mt View Water System WA5357000 | 44 | 0 | 0 | 4 | 1.7 ppbbelow the action level |
| Royal City Water WA5374700 | 3,389 | 0 | 0 | 0 | 1.2 ppbbelow the action level |
| Desert Aire Owner Assn WA5319056 | 2,856 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Soap Lake Water Dept WA5381300 | 2,399 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Electric City City of WA5322850 | 1,812 | 0 | 0 | 0 | 2.6 ppbbelow the action level |
| Sunland Estates Homeowners Assn WA5385240 | 1,480 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Grand Coulee Water Dept City of WA5328700 | 1,428 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lakeview Park Water Assn WA5345350 | 1,259 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Basin Water Sources INC WA5304600 | 1,158 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Crescent Bar System WA5315950 | 1,108 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| George City of WA5327395 | 1,035 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sunserra at Crescent Bar WA53AA745 | 1,000 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Coulee City Town of WA5315300 | 944 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Royal Water District WA5300543 | 430 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Wilson Creek Water Dept Town of WA5397400 | 386 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| Cascade Valley Water District WA5311500 | 379 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| Stratford Road Estates WA5307542 | 312 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Wanapum Village WA5329082 | 305 | 0 | 0 | 0 | 5.2 ppbbelow the action level |
| Hillcrest Water Users Assn WA5333200 | 300 | 0 | 0 | 0 | 13.1 ppbbelow the action level |
| Skyline Water System INC WA5380210 | 293 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sunrise Water Association WA5316177 | 250 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Crescent View Condominium Owners WA5303129 | 243 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Ridgeview Estates Water Association WA5303912 | 240 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| Sentinel Gap Water Assn WA5376620 | 226 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Westmont Acres WA5395240 | 206 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Outlaw Camp WA53AC008 | 193 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Country Club Estates Water System WA5318189 | 186 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Quail Run Mobile Home Park WA5339424 | 165 | 0 | 0 | 0 | 3.1 ppbbelow the action level |
| Cascade Village MHP WA5311488 | 164 | 0 | 0 | 0 | 1.8 ppbbelow the action level |
| Westshore Water Company WA5356143 | 153 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Skyline Acres INC WA5380200 | 151 | 0 | 0 | 0 | 4.6 ppbbelow the action level |
| The Village at Colockum Ridge WA5301639 | 144 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Marlin Hutterian WA53AA503 | 134 | 0 | 0 | 0 | 0 ppbbelow the action level |
| North Shore Acres WA5303370 | 116 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Diamond Point Water System WA5306536 | 110 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Ponderosa Mobile Home Park WA5368420 | 105 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Brixey H2a WA53AD929 | 100 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Desert Villa WA5319068 | 100 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Doc Stewart WA53AD731 | 100 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Winchester West Farmworker Housing WA53AD611 | 100 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Winchester Farmworker - Cfp WA53AD160 | 96 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Country Corner Mobile Home Park WA5306456 | 95 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Skyline East Orchard WA53AB958 | 93 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Whispering Rock Farmworker Housing WA53AC660 | 92 | 0 | 0 | 0 | 0 ppbbelow the action level |
| First Potholes Water Users Assn WA5325250 | 90 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Viking Road Water System WA5319208 | 88 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Marine View Home Owners Assn WA5351724 | 87 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Wagon Wheel MHP WA5308131 | 86 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Admiral Water Users Assn WA5334544 | 74 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Painted Hills Water Association WA5365640 | 70 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sunset Acres Water Assn WA5385940 | 61 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Sun Valley Orchard Farmworker WA53AD198 | 52 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Meadow Park Water System WA5305848 | 48 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Legacy Resort WA53AB961 | 46 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cougar Campers WA53AB548 | 44 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Fordair Water Co-Op INC WA5325800 | 43 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lakeview Mobile Terrace WA5345312 | 43 | 0 | 0 | 0 | 2.7 ppbbelow the action level |
| Sage Hills Estates 1 WA5301371 | 38 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Silver Sands Condo Water WA5302345 | 37 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sage Hills Second Water System WA5304398 | 34 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Orchard Homes Water System WA5364080 | 31 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Desert Hills WA53AC131 | 30 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sun Desert INC WA5319936 | 27 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Wagon Wheel Estate WA5392062 | 25 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Lake Ridge Hills Water Assn WA5314691 | 30 | 0 | 0 | 0 | not reported |
| Maples Plat Water System WA5375340 | 30 | 0 | 0 | 0 | not reported |
| Lyons Water System WA53AA796 | 28 | 0 | 0 | 0 | not reported |
| Park Orchard Tract 40 WA5366139 | 25 | 0 | 0 | 0 | not reported |
USGS · Monitoring stations
The water, more recently.
Available station readings in Grant County, Washington. 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 Grant County
14ZIP 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
- Desert Aire
- Electric City
- Ephrata
- George
- Hartline
- Krupp (Marlin)
- Moses Lake
- Quincy
- Royal City
- Schwana
- Soap Lake
- Warden
- Wilson Creek
View ZIP areas and understand coverage
- 98823Ephrata
- 98824George
- 98832Krupp (Marlin)
- 98837Moses Lake
- 98848Quincy
- 98851Soap Lake
- 98853
- 98857Warden
- 98860Wilson Creek
- 99123Electric City
- 99135Hartline
- 99321Schwana
- 99349Desert Aire
- 99357Royal City
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.