MOSSYROCK PUBLIC UTILITY CITY OF
PWS ID: WA5356350 · Mossyrock, Washington 98564
Population Served
1,553
Total Violations
52
Health-Based Violations
3
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 532
- County
- Lewis
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 41
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 17 | 2013 |
| Coliform (TCR) | MR | 11 | 2016 |
| Consumer Confidence Rule | Other | 7 | 2025 |
| Coliform (TCR) | MCL | 3 | 1996 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2015 |
| TTHM | MR | 2 | 2015 |
| Chromium | MR | 1 | 1979 |
| Barium | MR | 1 | 1979 |
| Selenium | MR | 1 | 1979 |
| Fluoride | MR | 1 | 1979 |
| Mercury | MR | 1 | 1979 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
| Lead and Copper Rule | MR | 1 | 1999 |
| Arsenic | MR | 1 | 1979 |
| Cadmium | MR | 1 | 1979 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.