Grindstone Rancheria
PWS ID: 090605004 · Elk Creek, 09 95939
Population Served
150
Total Violations
1,214
Health-Based Violations
210
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 58
- School/Daycare
- No
- MCL Violations
- 17
- Monitoring Violations
- 705
- Treatment Tech Violations
- 193
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | MR | 174 | 2025 |
| Surface Water Treatment Rule | TT | 174 | 2024 |
| Public Notice | Other | 130 | 2024 |
| Coliform (TCR) | MR | 58 | 2016 |
| Revised Total Coliform Rule | MON | 36 | 2025 |
| Consumer Confidence Rule | Other | 27 | 2024 |
| Revised Total Coliform Rule | MCL | 14 | 2022 |
| Nitrate | MR | 13 | 2024 |
| Revised Total Coliform Rule | TT | 12 | 2022 |
| Chlorine | MR | 8 | 2025 |
| Interim Enhanced Surface Water Treatment Rule | MR | 8 | 2009 |
| BHC-GAMMA | MR | 7 | 2020 |
| Methoxychlor | MR | 7 | 2020 |
| Toxaphene | MR | 7 | 2020 |
| Carbofuran | MR | 7 | 2020 |
| Atrazine | MR | 7 | 2020 |
| LASSO | MR | 7 | 2020 |
| Heptachlor | MR | 7 | 2020 |
| Heptachlor epoxide | MR | 7 | 2020 |
| 2,4-D | MR | 7 | 2020 |
| 2,4,5-TP | MR | 7 | 2020 |
| Pentachlorophenol | MR | 7 | 2020 |
| cis-1,2-Dichloroethylene | MR | 7 | 2020 |
| Total Polychlorinated Biphenyls (PCB) | MR | 7 | 2020 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 7 | 2020 |
| ETHYLENE DIBROMIDE | MR | 7 | 2020 |
| Xylenes, Total | MR | 7 | 2020 |
| Chlordane | MR | 7 | 2020 |
| o-Dichlorobenzene | MR | 7 | 2020 |
| p-Dichlorobenzene | MR | 7 | 2020 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.