HARLEM CITY OF
PWS ID: MT0000239 · HARLEM, Montana 59526
Population Served
820
Total Violations
561
Health-Based Violations
298
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 375
- County
- Blaine
- School/Daycare
- No
- MCL Violations
- 293
- Monitoring Violations
- 228
- Treatment Tech Violations
- 5
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 226 | 2025 |
| Total Haloacetic Acids (HAA5) | MCL | 67 | 2024 |
| CARBON, TOTAL | MR | 45 | 2004 |
| Total Haloacetic Acids (HAA5) | MR | 26 | 2025 |
| TTHM | MR | 26 | 2025 |
| Consumer Confidence Rule | Other | 25 | 2025 |
| Revised Total Coliform Rule | MON | 23 | 2024 |
| Lead and Copper Rule | MR | 8 | 2024 |
| Arsenic | MR | 7 | 2016 |
| Coliform (TCR) | MR | 6 | 2016 |
| Nitrate | MR | 3 | 1997 |
| Surface Water Treatment Rule | MR | 3 | 2014 |
| 1,2,4-Trichlorobenzene | MR | 3 | 2021 |
| cis-1,2-Dichloroethylene | MR | 3 | 2021 |
| p-Dichlorobenzene | MR | 3 | 2021 |
| 1,1-Dichloroethylene | MR | 3 | 2021 |
| trans-1,2-Dichloroethylene | MR | 3 | 2021 |
| 1,2-Dichloroethane | MR | 3 | 2021 |
| Carbon tetrachloride | MR | 3 | 2021 |
| 1,2-Dichloropropane | MR | 3 | 2021 |
| 1,1,2-Trichloroethane | MR | 3 | 2021 |
| Tetrachloroethylene | MR | 3 | 2021 |
| Benzene | MR | 3 | 2021 |
| Toluene | MR | 3 | 2021 |
| Ethylbenzene | MR | 3 | 2021 |
| Styrene | MR | 3 | 2021 |
| Long Term 2 Enhanced Surface Water Treatment Rule | TT | 3 | 2024 |
| Vinyl chloride | MR | 3 | 2021 |
| Long Term 2 Enhanced Surface Water Treatment Rule | MR | 3 | 2014 |
| o-Dichlorobenzene | MR | 3 | 2021 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.