GRASS VALLEY WATER SYSTEM
PWS ID: OR4100356 · GRASS VALLEY, Oregon 97029
Population Served
184
Total Violations
139
Health-Based Violations
26
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 92
- County
- Sherman
- School/Daycare
- No
- MCL Violations
- 26
- Monitoring Violations
- 103
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 37 | 2011 |
| Coliform (TCR) | MCL | 26 | 2009 |
| Nitrate | MR | 5 | 2009 |
| Consumer Confidence Rule | Other | 4 | 2004 |
| Lead and Copper Rule | MR | 4 | 2022 |
| Carbon tetrachloride | MR | 1 | 1999 |
| CHLOROBENZENE | MR | 1 | 1999 |
| o-Dichlorobenzene | MR | 1 | 1999 |
| Toluene | MR | 1 | 1999 |
| Trichloroethylene | MR | 1 | 1999 |
| 2,4-D | MR | 1 | 1999 |
| 2,4,5-TP | MR | 1 | 1999 |
| Di(2-ethylhexyl) adipate | MR | 1 | 1999 |
| LASSO | MR | 1 | 1999 |
| Atrazine | MR | 1 | 1999 |
| BHC-GAMMA | MR | 1 | 1999 |
| Chlordane | MR | 1 | 1999 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 1 | 1999 |
| Dinoseb | MR | 1 | 1999 |
| Endothall | MR | 1 | 1999 |
| Endrin | MR | 1 | 1999 |
| Glyphosate | MR | 1 | 1999 |
| Hexachlorocyclopentadiene | MR | 1 | 1999 |
| Methoxychlor | MR | 1 | 1999 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 1999 |
| Picloram | MR | 1 | 1999 |
| Total Polychlorinated Biphenyls (PCB) | MR | 1 | 1999 |
| Simazine | MR | 1 | 1999 |
| Toxaphene | MR | 1 | 1999 |
| OXAMYL | MR | 1 | 1999 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.