LOWER PIONEER MOUNTAIN WATER SYSTEM
PWS ID: MT0004462 · BIG SKY, Montana 59716
Population Served
350
Total Violations
168
Health-Based Violations
7
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 210
- County
- Madison
- School/Daycare
- No
- MCL Violations
- 7
- Monitoring Violations
- 159
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Gross Alpha, Excl. Radon and U | MR | 12 | 2008 |
| Lead and Copper Rule | MR | 7 | 2009 |
| DICHLOROMETHANE | MR | 6 | 2008 |
| p-Dichlorobenzene | MR | 6 | 2008 |
| Vinyl chloride | MR | 6 | 2008 |
| 1,1-Dichloroethylene | MR | 6 | 2008 |
| trans-1,2-Dichloroethylene | MR | 6 | 2008 |
| 1,2-Dichloroethane | MR | 6 | 2008 |
| Carbon tetrachloride | MR | 6 | 2008 |
| Trichloroethylene | MR | 6 | 2008 |
| 1,1,2-Trichloroethane | MR | 6 | 2008 |
| CHLOROBENZENE | MR | 6 | 2008 |
| Benzene | MR | 6 | 2008 |
| Ethylbenzene | MR | 6 | 2008 |
| Xylenes, Total | MR | 6 | 2008 |
| 1,2-Dichloropropane | MR | 6 | 2008 |
| Combined Radium (-226 and -228) | MR | 6 | 2008 |
| Tetrachloroethylene | MR | 6 | 2008 |
| Toluene | MR | 6 | 2008 |
| Styrene | MR | 6 | 2008 |
| 1,2,4-Trichlorobenzene | MR | 6 | 2008 |
| 1,1,1-Trichloroethane | MR | 6 | 2008 |
| cis-1,2-Dichloroethylene | MR | 6 | 2008 |
| o-Dichlorobenzene | MR | 6 | 2008 |
| Coliform (TCR) | MR | 5 | 2010 |
| Coliform (TCR) | MCL | 4 | 2015 |
| E. COLI | MR | 3 | 2010 |
| Revised Total Coliform Rule | MCL | 3 | 2020 |
| Consumer Confidence Rule | Other | 2 | 2020 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.