County · Washington
Okanogan County, Washington: drinking water records
Explore EPA records for 44 community water systems across 19 ZIP codes in Okanogan 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 1 of the 44 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 44 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 |
|---|---|---|---|---|---|
| Omak City of WA5363750 | 4,940 | 180 | 1 | 0 | 3 ppbbelow the action level |
| Progressive Flat Water Assn WA5369650 | 335 | 0 | 0 | 1 | 5.2 ppbbelow the action level |
| Paschal Sherman Indian School 105300009 | 220 | 0 | 0 | 5 | 2.2 ppbbelow the action level |
| River Road Mobile Home Park WA5317631 | 150 | 0 | 0 | 2 | 0 ppbbelow the action level |
| Brewster City of WA5308300 | 3,843 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Okanogan Water Department City of WA5363200 | 3,817 | 0 | 0 | 0 | 1.4 ppbbelow the action level |
| Oroville City of WA5364400 | 3,256 | 0 | 0 | 0 | 3.2 ppbbelow the action level |
| Tonasket Water System WA5388700 | 2,398 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Coulee Dam Water Dept WA5315400 | 1,454 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Winthrop Town of WA5397750 | 1,350 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Twisp Town of WA5390050 | 1,173 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| Monse-Riggan Camp WA53AC141 | 1,165 | 0 | 0 | 1 | not reported |
| Pateros Water Department WA5366450 | 1,149 | 0 | 0 | 0 | 2.8 ppbbelow the action level |
| Jaw Farms INC WA5308246 | 636 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Duck Lake Water Association WA5320200 | 635 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Brewster Flat Domestic Water Assn WA5308290 | 542 | 0 | 0 | 0 | 3.6 ppbbelow the action level |
| Nespelem Water Dept WA5359000 | 510 | 0 | 0 | 0 | 0 ppbbelow the action level |
| P and G Orchards Camp 2 WA5307870 | 489 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Riverside Town of WA5372850 | 429 | 0 | 0 | 0 | 0.2 ppbbelow the action level |
| Elmer City Water System WA5323120 | 368 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sandflat Water Association WA5309064 | 260 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Suncrest Plat Water System WA5385207 | 260 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Coleman Butte Water Assn WA5313940 | 250 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Loomis Water Users Assn INC WA5348200 | 225 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Alta Lake Golf Course Plat WA5319204 | 161 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Aston Estates WA5309066 | 141 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Crumbacher Estates Water System WA5313916 | 111 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Homestead Mobile Home Park WA5301576 | 105 | 0 | 0 | 0 | 0 ppbbelow the action level |
| M J Trailer Ranch WA5349515 | 100 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Edelweiss Maintenance Commission WA5322340 | 95 | 0 | 0 | 0 | 1.1 ppbbelow the action level |
| Pine Forest Water System WA5367393 | 90 | 0 | 0 | 0 | 2.7 ppbbelow the action level |
| Old Orchard Estates Water System WA5307748 | 86 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Lost River Airport Association WA5348348 | 72 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Wolf Creek Property Owners Assn WA5311476 | 71 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| Pinecrest Subdivison Owners WA5313909 | 63 | 0 | 0 | 0 | 1.8 ppbbelow the action level |
| Emanuel Heights Water System WA5326916 | 60 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Vista Vue Water Users Assn WA5320226 | 60 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Appleway Trailer Court WA5300603 | 54 | 0 | 0 | 0 | 2.3 ppbbelow the action level |
| Hi-Color Orchard Farmworker Housing WA53AC993 | 53 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Johnson Creek Water Users Assn WA5339411 | 48 | 0 | 0 | 0 | 1.9 ppbbelow the action level |
| Methow Water System INC WA5354370 | 45 | 0 | 0 | 0 | 1.4 ppbbelow the action level |
| Many Lakes Mobile Home Park WA5304670 | 37 | 0 | 0 | 0 | 2.4 ppbbelow the action level |
| Valley View Estates Water System WA5306321 | 28 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| Twin Pines Mobile Home Park WA5331790 | 25 | 0 | 0 | 0 | not reported |
USGS · Monitoring stations
The water, more recently.
Available station readings in Okanogan 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 Okanogan County
19ZIP 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
- Brewster
- Conconully
- Coulee Dam
- Elmer City
- Loomis
- Malott
- Methow
- Nespelem Community
- North Omak
- Okanogan
- Oroville
- Pateros
- Riverside
- Tonasket
- Twisp
- Winthrop
View ZIP areas and understand coverage
- 98812Brewster
- 98814
- 98819Conconully
- 98827Loomis
- 98829Malott
- 98833
- 98834Methow
- 98840Okanogan
- 98841North Omak
- 98844Oroville
- 98846Pateros
- 98849Riverside
- 98855Tonasket
- 98856Twisp
- 98859
- 98862Winthrop
- 99116Coulee Dam
- 99124Elmer City
- 99155Nespelem Community
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.