HAT ROCK WATER COMPANY
PWS ID: OR4101309 · HERMISTON, Oregon 97838
Population Served
108
Total Violations
170
Health-Based Violations
46
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 43
- County
- Umatilla
- School/Daycare
- No
- MCL Violations
- 43
- Monitoring Violations
- 114
- Treatment Tech Violations
- 3
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MCL | 27 | 2017 |
| Coliform (TCR) | MR | 19 | 2014 |
| Coliform (TCR) | MCL | 16 | 2014 |
| Nitrate | MR | 14 | 2021 |
| Revised Total Coliform Rule | MON | 8 | 2024 |
| Public Notice | Other | 5 | 2019 |
| Revised Total Coliform Rule | TT | 3 | 2019 |
| E. COLI | MR | 2 | 2019 |
| DICHLOROMETHANE | MR | 2 | 2020 |
| o-Dichlorobenzene | MR | 2 | 2020 |
| p-Dichlorobenzene | MR | 2 | 2020 |
| Vinyl chloride | MR | 2 | 2020 |
| 1,1-Dichloroethylene | MR | 2 | 2020 |
| Carbon tetrachloride | MR | 2 | 2020 |
| Trichloroethylene | MR | 2 | 2020 |
| 1,1,2-Trichloroethane | MR | 2 | 2020 |
| Tetrachloroethylene | MR | 2 | 2020 |
| Toluene | MR | 2 | 2020 |
| Ethylbenzene | MR | 2 | 2020 |
| Styrene | MR | 2 | 2020 |
| cis-1,2-Dichloroethylene | MR | 2 | 2020 |
| trans-1,2-Dichloroethylene | MR | 2 | 2020 |
| 1,2-Dichloroethane | MR | 2 | 2020 |
| 1,1,1-Trichloroethane | MR | 2 | 2020 |
| 1,2-Dichloropropane | MR | 2 | 2020 |
| CHLOROBENZENE | MR | 2 | 2020 |
| Consumer Confidence Rule | Other | 2 | 2023 |
| Xylenes, Total | MR | 2 | 2020 |
| 1,2,4-Trichlorobenzene | MR | 2 | 2020 |
| Benzene | MR | 2 | 2020 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.