EAST DECKER COAL MINE
PWS ID: MT0000953 · DECKER, Montana 59025
Population Served
28
Total Violations
31
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Private
- Connections
- 3
- County
- Big Horn
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 31
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Groundwater Rule | MR | 11 | 2025 |
| Lead and Copper Rule | MR | 5 | 2023 |
| TTHM | MR | 3 | 2004 |
| Revised Total Coliform Rule | MON | 3 | 2021 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2004 |
| OXAMYL | MR | 1 | 1996 |
| Nitrate | MR | 1 | 1981 |
| Carbofuran | MR | 1 | 1996 |
| Aldicarb sulfoxide | MR | 1 | 1996 |
| Aldicarb | MR | 1 | 1996 |
| Aldicarb sulfone | MR | 1 | 1996 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.