GRANITE PARK WATER ASSOCIATION
PWS ID: MT0004563 · BILLINGS, Montana 59101
Population Served
250
Total Violations
50
Health-Based Violations
3
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 120
- County
- Yellowstone
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 43
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Gross Alpha, Excl. Radon and U | MR | 9 | 2009 |
| E. COLI | MR | 7 | 2020 |
| Nitrate-Nitrite | MR | 7 | 2023 |
| Combined Radium (-226 and -228) | MR | 6 | 2008 |
| Chlorine | MR | 3 | 2013 |
| TTHM | MR | 3 | 2018 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2018 |
| Nitrate-Nitrite | MCL | 3 | 2024 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2015 |
| Lead and Copper Rule | MR | 2 | 2014 |
| Consumer Confidence Rule | Other | 2 | 2023 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.