HILLSBORO-CHERRY GROVE
PWS ID: OR4100985 · HILLSBORO, Oregon 97123
Population Served
1,628
Total Violations
57
Health-Based Violations
7
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 577
- County
- Washington
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 46
- Treatment Tech Violations
- 6
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | MR | 9 | 2023 |
| Interim Enhanced Surface Water Treatment Rule | MR | 5 | 2023 |
| Lead and Copper Rule | TT | 4 | 2002 |
| Coliform (TCR) | MR | 2 | 1991 |
| TTHM | MR | 2 | 2009 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2009 |
| Surface Water Treatment Rule | TT | 2 | 1992 |
| Arsenic | MR | 1 | 2007 |
| Xylenes, Total | MR | 1 | 2007 |
| DICHLOROMETHANE | MR | 1 | 2007 |
| p-Dichlorobenzene | MR | 1 | 2007 |
| Vinyl chloride | MR | 1 | 2007 |
| 1,1-Dichloroethylene | MR | 1 | 2007 |
| 1,2-Dichloroethane | MR | 1 | 2007 |
| Carbon tetrachloride | MR | 1 | 2007 |
| 1,2-Dichloropropane | MR | 1 | 2007 |
| Trichloroethylene | MR | 1 | 2007 |
| 1,1,2-Trichloroethane | MR | 1 | 2007 |
| Tetrachloroethylene | MR | 1 | 2007 |
| CHLOROBENZENE | MR | 1 | 2007 |
| Toluene | MR | 1 | 2007 |
| Styrene | MR | 1 | 2007 |
| Coliform (TCR) | MCL | 1 | 1991 |
| Ethylbenzene | MR | 1 | 2007 |
| Benzene | MR | 1 | 2007 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2007 |
| Long Term 2 Enhanced Surface Water Treatment Rule | MR | 1 | 2008 |
| 1,1,1-Trichloroethane | MR | 1 | 2007 |
| Consumer Confidence Rule | Other | 1 | 2025 |
| Combined Radium (-226 and -228) | MR | 1 | 1976 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.