RIVER ROCK COUNTY WATER AND SEWER DIST
PWS ID: MT0004082 · BELGRADE, Montana 59714
Population Served
4,200
Total Violations
176
Health-Based Violations
28
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 1,204
- County
- Gallatin
- School/Daycare
- No
- MCL Violations
- 28
- Monitoring Violations
- 136
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 59 | 2024 |
| Coliform (TCR) | MCL | 28 | 2008 |
| TTHM | MR | 18 | 2024 |
| Total Haloacetic Acids (HAA5) | MR | 18 | 2024 |
| Consumer Confidence Rule | Other | 10 | 2015 |
| Nitrate-Nitrite | MR | 9 | 2021 |
| Asbestos | MR | 4 | 2020 |
| Coliform (TCR) | MR | 4 | 2002 |
| Diquat | MR | 3 | 2020 |
| Endothall | MR | 3 | 2020 |
| ETHYLENE DIBROMIDE | MR | 3 | 2020 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 3 | 2020 |
| Antimony, Total | MR | 3 | 2017 |
| CYANIDE | MR | 3 | 2020 |
| Glyphosate | MR | 3 | 2020 |
| Total Polychlorinated Biphenyls (PCB) | MR | 3 | 2020 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 60 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| 4:2 FTS | 5/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| ADONA | 5/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTrDA | 5/15/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 5/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 5/15/2024 | <9 µg/L | 9 µg/L | Not Detected |
| PFHpS | 5/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 5/15/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 5/15/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 5/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 5/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 5/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 5/15/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 5/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 5/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 5/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 5/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 5/15/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| 9Cl-PF3ONS | 5/15/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 5/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 5/15/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 5/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 5/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 5/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 5/15/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 5/15/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFNA | 5/15/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHxS | 5/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 5/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 5/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 5/15/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFBS | 11/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 11/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 11/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 11/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 11/8/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 11/8/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFNA | 11/8/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpA | 11/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 11Cl-PF3OUdS | 11/8/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 11/8/2023 | <9 µg/L | 9 µg/L | Not Detected |
| PFTrDA | 11/8/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 11/8/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHxS | 11/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 11/8/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFPeS | 11/8/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 11/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 11/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 11/8/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFMBA | 11/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 11/8/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
PFAS data from EPA UCMR5 monitoring program (2023-2025).
This data is provided for informational purposes only.