WATER RESOURCES DIVISION
PWS ID: MT0003623 · MISSOULA, Montana 59804
Population Served
60
Total Violations
381
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- State
- Connections
- 7
- County
- Missoula
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 379
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 40 | 2013 |
| Nitrate-Nitrite | MR | 23 | 2024 |
| Lead and Copper Rule | MR | 12 | 2014 |
| TTHM | MR | 12 | 2023 |
| Total Haloacetic Acids (HAA5) | MR | 12 | 2023 |
| Revised Total Coliform Rule | MON | 12 | 2024 |
| Barium | MR | 8 | 2008 |
| Chromium | MR | 8 | 2008 |
| Fluoride | MR | 8 | 2008 |
| Nickel | MR | 8 | 2008 |
| Beryllium, Total | MR | 8 | 2008 |
| Cadmium | MR | 8 | 2008 |
| Mercury | MR | 8 | 2008 |
| Selenium | MR | 8 | 2008 |
| Thallium, Total | MR | 8 | 2008 |
| Antimony, Total | MR | 8 | 2008 |
| Aldicarb sulfone | MR | 6 | 2008 |
| OXAMYL | MR | 6 | 2008 |
| Carbofuran | MR | 6 | 2008 |
| Aldicarb | MR | 6 | 2008 |
| Aldicarb sulfoxide | MR | 6 | 2008 |
| BHC-GAMMA | MR | 4 | 2008 |
| Methoxychlor | MR | 4 | 2008 |
| Toxaphene | MR | 4 | 2008 |
| Dalapon | MR | 4 | 2008 |
| Di(2-ethylhexyl) adipate | MR | 4 | 2008 |
| Simazine | MR | 4 | 2008 |
| Picloram | MR | 4 | 2008 |
| LASSO | MR | 4 | 2008 |
| Heptachlor | MR | 4 | 2008 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.