SWLO AND MAIN OFFICE
PWS ID: MT0003624 · MISSOULA, Montana 59804
Population Served
75
Total Violations
365
Health-Based Violations
16
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- State
- Connections
- 2
- County
- Missoula
- School/Daycare
- No
- MCL Violations
- 16
- Monitoring Violations
- 347
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 50 | 2013 |
| Nitrate-Nitrite | MR | 17 | 2024 |
| Coliform (TCR) | MCL | 16 | 2005 |
| Revised Total Coliform Rule | MON | 12 | 2024 |
| Dinoseb | MR | 8 | 2011 |
| 2,4-D | MR | 8 | 2011 |
| Pentachlorophenol | MR | 8 | 2011 |
| 2,4,5-TP | MR | 8 | 2011 |
| Dalapon | MR | 8 | 2011 |
| Picloram | MR | 8 | 2011 |
| Lead and Copper Rule | MR | 7 | 2014 |
| Endrin | MR | 5 | 2008 |
| OXAMYL | MR | 5 | 2008 |
| Simazine | MR | 5 | 2008 |
| Heptachlor | MR | 5 | 2008 |
| Benzo(a)pyrene | MR | 5 | 2008 |
| Chlordane | MR | 5 | 2008 |
| Heptachlor epoxide | MR | 5 | 2008 |
| Carbofuran | MR | 5 | 2008 |
| Atrazine | MR | 5 | 2008 |
| Aldicarb sulfoxide | MR | 5 | 2008 |
| Aldicarb | MR | 5 | 2008 |
| LASSO | MR | 5 | 2008 |
| Methoxychlor | MR | 5 | 2008 |
| Aldicarb sulfone | MR | 5 | 2008 |
| BHC-GAMMA | MR | 5 | 2008 |
| Toxaphene | MR | 5 | 2008 |
| Di(2-ethylhexyl) adipate | MR | 5 | 2008 |
| Cadmium | MR | 4 | 2008 |
| Fluoride | MR | 4 | 2008 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.