Grindstone Rancheria EPA Drinking Water Compliance Record
TapScore summarizes EPA Safe Drinking Water Information System records for public water system 090605004. It does not test household tap water or determine whether water is currently safe to drink.
Frequent health-based records
TapScore compliance-history grade
129 EPA violation records from July 1, 2021 through June 30, 2026
30 classified as health-based
System details
- PWSID
- 090605004
- Population served
- 150
- Water source
- Surface Water
- Owner type
- Native American
- State
- Connecticut
- EPA region
- 9
- All historical records
- 899
- Not marked resolved
- 122
How to read this grade
Grade F means “Frequent health-based records” under TapScore's published method. It is a comparison of recent EPA compliance records, not an EPA grade, laboratory result, health recommendation, or guarantee of present water quality.
EPA contaminant categories in violation records
| EPA category | Classification | Records |
|---|---|---|
| Surface Water Treatment Rule | Health-based record | 291 |
| Public Notice | Monitoring/reporting record | 90 |
| Coliform (TCR) | Health-based record | 61 |
| Revised Total Coliform Rule | Health-based record | 49 |
| Consumer Confidence Rule | Monitoring/reporting record | 18 |
| Nitrate | Monitoring/reporting record | 12 |
| Interim Enhanced Surface Water Treatment Rule | Health-based record | 12 |
| BHC-GAMMA | Monitoring/reporting record | 6 |
| Methoxychlor | Monitoring/reporting record | 6 |
| Toxaphene | Monitoring/reporting record | 6 |
| Carbofuran | Monitoring/reporting record | 6 |
| Atrazine | Monitoring/reporting record | 6 |
| Benzene | Monitoring/reporting record | 6 |
| Heptachlor | Monitoring/reporting record | 6 |
| Heptachlor epoxide | Monitoring/reporting record | 6 |
| 2,4-D | Monitoring/reporting record | 6 |
| 2,4,5-TP | Monitoring/reporting record | 6 |
| Pentachlorophenol | Monitoring/reporting record | 6 |
| Vinyl Chloride | Monitoring/reporting record | 6 |
| Total Polychlorinated Biphenyls (PCB) | Monitoring/reporting record | 6 |
Showing the 20 categories with the most records out of 81 categories in this system's history.
These are compliance records associated with an EPA contaminant code, not current tap-water test results or proof that a substance is presently detected.
Violation history by year
Historical counts may include resolved records. For current notices and local sampling results, check the utility's latest Consumer Confidence Report and your state drinking-water agency.