TONASKET WATER SYSTEM
PWS ID: WA5388700 · Tonasket, Washington 98855
Population Served
2,392
Total Violations
25
Health-Based Violations
10
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 602
- County
- Okanogan
- School/Daycare
- No
- MCL Violations
- 10
- Monitoring Violations
- 13
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 10 | 1998 |
| Coliform (TCR) | MR | 2 | 2014 |
| Revised Total Coliform Rule | MON | 2 | 2020 |
| Consumer Confidence Rule | Other | 1 | 2018 |
| Mercury | MR | 1 | 1979 |
| Fluoride | MR | 1 | 1979 |
| Selenium | MR | 1 | 1979 |
| Nitrate | MR | 1 | 1979 |
| Cadmium | MR | 1 | 1979 |
| Arsenic | MR | 1 | 1979 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
| Chromium | MR | 1 | 1979 |
| Barium | MR | 1 | 1979 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.