Tonasket Water Quality
Washington
According to EPA SDWIS, Tonasket, Washington is served by 34 community water systems covering about 7,007 people. The same extract lists 29 health-based violation records, most recently coded 1025 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Tonasket, Washington is delivered through 34 EPA-regulated community water systems serving an estimated 7,007 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 29 violation records across the 34 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 5 distinct EPA contaminant codes: Fluoride, Arsenic, Revised Total Coliform Rule, Combined Uranium, Nitrate.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Washington drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| TONASKET WATER SYSTEM | 2,398 | 0 | Clean |
| INCHELIUM WATER DISTRICT | 540 | 3 | Health |
| CORRAL SPRINGS WATER SYSTEM | 336 | 0 | Clean |
| PROGRESSIVE FLAT WATER ASSN | 335 | 1 | Health |
| Crane Ranch | 329 | 0 | Clean |
| SANDFLAT WATER ASSOCIATION | 260 | 0 | Clean |
| SUNCREST PLAT WATER SYSTEM | 260 | 0 | Clean |
| COLEMAN BUTTE WATER ASSN | 250 | 0 | Clean |
| LOOMIS WATER USERS ASSN INC | 225 | 0 | Clean |
| HANSON HARBOR HOMEOWNERS ASSN | 220 | 0 | Clean |
| AFC RANCH 1 | 217 | 0 | Clean |
| RIVER ROAD MOBILE HOME PARK | 150 | 2 | Health |
| ASTON ESTATES | 141 | 0 | Clean |
| AFC RANCH 2 | 125 | 0 | Clean |
| CRUMBACHER ESTATES WATER SYSTEM | 111 | 0 | Clean |
| MARTIN CREEK COMMUNITY ASSN | 108 | 16 | Health |
| HOMESTEAD MOBILE HOME PARK | 105 | 0 | Clean |
| PINE FOREST WATER SYSTEM | 90 | 0 | Clean |
| OLD ORCHARD ESTATES WATER SYSTEM | 86 | 0 | Clean |
| LOST RIVER AIRPORT ASSOCIATION | 72 | 0 | Clean |
| WOLF CREEK PROPERTY OWNERS ASSN | 71 | 0 | Clean |
| PINECREST SUBDIVISON OWNERS | 63 | 0 | Clean |
| CASCADE FOOTHILLS | 61 | 0 | Clean |
| VISTA VUE WATER USERS ASSN | 60 | 0 | Clean |
| WITHROW WATER WORKS | 60 | 2 | Health |
| APPLEWAY TRAILER COURT | 54 | 0 | Clean |
| COLUMBIA SPRINGS ESTATES | 54 | 0 | Clean |
| JOHNSON CREEK WATER USERS ASSN | 48 | 2 | Health |
| RIVERWOOD WATER SYSTEM | 43 | 0 | Clean |
| ELM TREE WATER & SEWER ASSN | 38 | 0 | Clean |
| MANY LAKES MOBILE HOME PARK | 37 | 0 | Clean |
| Valley View Estates Water System | 28 | 0 | Clean |
| TWIN PINES MOBILE HOME PARK | 25 | 0 | Clean |
| AZWELL ORCHARDS | 7 | 3 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2025-10-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2025-07-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2025-04-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2025-01-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2024-10-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2024-10-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2024-10-01 |
| RIVER ROAD MOBILE HOME PARK | Arsenic | 2024-10-01 |
| RIVER ROAD MOBILE HOME PARK | Arsenic | 2024-10-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2024-07-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2024-07-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2024-04-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2024-04-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2024-01-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2024-01-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2023-10-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2023-10-01 |
| MARTIN CREEK COMMUNITY ASSN | Fluoride | 2023-10-01 |
| INCHELIUM WATER DISTRICT | Revised Total Coliform Rule | 2022-10-01 |
| INCHELIUM WATER DISTRICT | Revised Total Coliform Rule | 2022-10-01 |
| INCHELIUM WATER DISTRICT | Revised Total Coliform Rule | 2022-10-01 |
| PROGRESSIVE FLAT WATER ASSN | Revised Total Coliform Rule | 2021-06-01 |
| AZWELL ORCHARDS | Revised Total Coliform Rule | 2019-07-01 |
| AZWELL ORCHARDS | Revised Total Coliform Rule | 2019-07-01 |
| AZWELL ORCHARDS | Revised Total Coliform Rule | 2019-07-01 |
| JOHNSON CREEK WATER USERS ASSN | Arsenic | 2017-07-01 |
| JOHNSON CREEK WATER USERS ASSN | Combined Uranium | 2017-01-01 |
| WITHROW WATER WORKS | Nitrate | 2016-01-01 |
| WITHROW WATER WORKS | Nitrate | 2016-01-01 |
What are Tonasket's health-based records for?
Tonasket's health-based violation records carry 5 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Fluoride | 16 | 1 |
| Revised Total Coliform Rule | 7 | 3 |
| Arsenic | 3 | 2 |
| Nitrate | 2 | 1 |
| Combined Uranium | 1 | 1 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Tonasket, Washington? ▼
How many water violations does Tonasket have in this EPA extract? ▼
What contaminants were found in Tonasket water? ▼
How many water systems serve Tonasket? ▼
Where does Tonasket get its drinking water? ▼
How does Tonasket compare in Washington?
Of the 365 Washington places with at least one community water system on file, Tonasket ranks #15 by number of systems (34).
Either side of it: Poulsbo (35), Spokane (35), Lynden (31), Cle Elum (28)
About This Data
Figures here are the current EPA SDWIS extract joined to the 34 community water systems whose service area lists Tonasket, ranked against the 365 Washington places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.