CHINOOK CITY OF
PWS ID: MT0000174 · CHINOOK, Montana 59532
Population Served
1,300
Total Violations
49
Health-Based Violations
28
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 807
- County
- Blaine
- School/Daycare
- No
- MCL Violations
- 14
- Monitoring Violations
- 20
- Treatment Tech Violations
- 14
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | TT | 14 | 1999 |
| Total Haloacetic Acids (HAA5) | MCL | 13 | 2025 |
| Fluoride | MR | 6 | 2004 |
| Coliform (TCR) | MR | 6 | 2014 |
| Arsenic | MR | 3 | 2002 |
| Thallium, Total | MR | 1 | 1994 |
| Nickel | MR | 1 | 1994 |
| Antimony, Total | MR | 1 | 1994 |
| Nitrate | MR | 1 | 1993 |
| o-Dichlorobenzene | MR | 1 | 1993 |
| DICHLOROMETHANE | MCL | 1 | 2000 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.