WINLOCK CITY OF
PWS ID: WA5397500 · WINLOCK, Washington 98596
Population Served
3,502
Total Violations
237
Health-Based Violations
7
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,040
- County
- Lewis
- School/Daycare
- No
- MCL Violations
- 7
- Monitoring Violations
- 223
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 12 | 2007 |
| cis-1,2-Dichloroethylene | MR | 8 | 2008 |
| Vinyl chloride | MR | 8 | 2008 |
| 1,1-Dichloroethylene | MR | 8 | 2008 |
| trans-1,2-Dichloroethylene | MR | 8 | 2008 |
| 1,1,1-Trichloroethane | MR | 8 | 2008 |
| Carbon tetrachloride | MR | 8 | 2008 |
| 1,2-Dichloropropane | MR | 8 | 2008 |
| CHLOROBENZENE | MR | 8 | 2008 |
| Benzene | MR | 8 | 2008 |
| Toluene | MR | 8 | 2008 |
| Styrene | MR | 8 | 2008 |
| 1,2,4-Trichlorobenzene | MR | 8 | 2008 |
| DICHLOROMETHANE | MR | 8 | 2008 |
| o-Dichlorobenzene | MR | 8 | 2008 |
| 1,1,2-Trichloroethane | MR | 8 | 2008 |
| Tetrachloroethylene | MR | 8 | 2008 |
| Ethylbenzene | MR | 8 | 2008 |
| p-Dichlorobenzene | MR | 8 | 2008 |
| Trichloroethylene | MR | 8 | 2008 |
| 1,2-Dichloroethane | MR | 8 | 2008 |
| Coliform (TCR) | MCL | 7 | 1998 |
| Consumer Confidence Rule | Other | 4 | 2014 |
| Coliform (TCR) | MR | 2 | 2010 |
| Pentachlorophenol | MR | 2 | 2008 |
| Arsenic | MR | 2 | 2005 |
| Selenium | MR | 2 | 2005 |
| Diquat | MR | 2 | 2006 |
| Cadmium | MR | 2 | 2005 |
| Barium | MR | 2 | 2005 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.