YNP-MAMMOTH HOT SPRINGS
PWS ID: WY5680092 · YELLOWSTONE NATIONAL PARK, Wyoming 82190
Population Served
2,600
Total Violations
14
Health-Based Violations
2
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Federal
- Connections
- 274
- County
- Park
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 12
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| CARBON, TOTAL | MR | 3 | 2005 |
| Surface Water Treatment Rule | TT | 2 | 2005 |
| Coliform (TCR) | MR | 2 | 2013 |
| Surface Water Treatment Rule | MR | 2 | 2023 |
| Total Haloacetic Acids (HAA5) | MR | 1 | 2017 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1980 |
| TTHM | MR | 1 | 2017 |
| Nitrate | MR | 1 | 1993 |
| Combined Radium (-226 and -228) | MR | 1 | 1980 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.