VERNONIA, CITY OF
PWS ID: OR4100922 · VERNONIA, Oregon 97064
Population Served
2,100
Total Violations
250
Health-Based Violations
6
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 975
- County
- Columbia
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 240
- Treatment Tech Violations
- 6
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | MR | 29 | 2023 |
| Coliform (TCR) | MR | 19 | 2016 |
| Interim Enhanced Surface Water Treatment Rule | MR | 16 | 2023 |
| Lead and Copper Rule | MR | 14 | 2025 |
| Revised Total Coliform Rule | MON | 11 | 2025 |
| TTHM | MR | 10 | 2014 |
| Total Haloacetic Acids (HAA5) | MR | 10 | 2014 |
| Nitrate | MR | 6 | 2015 |
| Arsenic | MR | 4 | 2008 |
| cis-1,2-Dichloroethylene | MR | 4 | 2015 |
| o-Dichlorobenzene | MR | 4 | 2015 |
| 1,1-Dichloroethylene | MR | 4 | 2015 |
| Carbon tetrachloride | MR | 4 | 2015 |
| Trichloroethylene | MR | 4 | 2015 |
| Tetrachloroethylene | MR | 4 | 2015 |
| CHLOROBENZENE | MR | 4 | 2015 |
| Benzene | MR | 4 | 2015 |
| Toluene | MR | 4 | 2015 |
| Xylenes, Total | MR | 4 | 2015 |
| Vinyl chloride | MR | 4 | 2015 |
| 1,2-Dichloroethane | MR | 4 | 2015 |
| 1,1,1-Trichloroethane | MR | 4 | 2015 |
| 1,2-Dichloropropane | MR | 4 | 2015 |
| Ethylbenzene | MR | 4 | 2015 |
| Styrene | MR | 4 | 2015 |
| 1,2,4-Trichlorobenzene | MR | 4 | 2015 |
| p-Dichlorobenzene | MR | 4 | 2015 |
| Surface Water Treatment Rule | TT | 4 | 2019 |
| DICHLOROMETHANE | MR | 4 | 2015 |
| trans-1,2-Dichloroethylene | MR | 4 | 2015 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.