POTOMAC SCHOOL DIST 11
PWS ID: MT0000855 · BONNER, Montana 59803
Population Served
160
Total Violations
141
Health-Based Violations
48
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 4
- County
- Missoula
- School/Daycare
- No
- MCL Violations
- 48
- Monitoring Violations
- 90
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 47 | 2013 |
| Coliform (TCR) | MR | 45 | 2015 |
| Chlorine | MR | 18 | 2013 |
| Revised Total Coliform Rule | MON | 9 | 2023 |
| Lead and Copper Rule | MR | 8 | 2009 |
| TTHM | MR | 3 | 2012 |
| Nitrate-Nitrite | MR | 3 | 2012 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2012 |
| Coliform (TCR) | MCL | 1 | 1992 |
| Nitrate | MR | 1 | 1997 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.