THOMPSON FALLS CITY OF
PWS ID: MT0000341 · THOMPSON FALLS, Montana 59813
Population Served
1,950
Total Violations
38
Health-Based Violations
3
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 719
- County
- Sanders
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 30
- Treatment Tech Violations
- 3
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 8 | 2005 |
| Surface Water Treatment Rule | TT | 3 | 1999 |
| Nitrate | MR | 3 | 1996 |
| Fluoride | MR | 2 | 1994 |
| Selenium | MR | 2 | 1994 |
| Mercury | MR | 2 | 1994 |
| Chromium | MR | 2 | 1994 |
| Barium | MR | 2 | 1994 |
| Cadmium | MR | 2 | 1994 |
| Arsenic | MR | 2 | 1994 |
| Consumer Confidence Rule | Other | 2 | 2015 |
| Thallium, Total | MR | 1 | 1994 |
| Antimony, Total | MR | 1 | 1994 |
| CYANIDE | MR | 1 | 1994 |
| Beryllium, Total | MR | 1 | 1994 |
| Nickel | MR | 1 | 1994 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.