OAK RIDGE ESTATES
PWS ID: MT0004250 · BILLINGS, Montana 59101
Population Served
200
Total Violations
373
Health-Based Violations
7
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 81
- County
- Yellowstone
- School/Daycare
- No
- MCL Violations
- 7
- Monitoring Violations
- 353
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 29 | 2014 |
| TTHM | MR | 15 | 2006 |
| Total Haloacetic Acids (HAA5) | MR | 15 | 2006 |
| Coliform (TCR) | MR | 14 | 2006 |
| 1,2,4-Trichlorobenzene | MR | 13 | 2008 |
| cis-1,2-Dichloroethylene | MR | 13 | 2008 |
| DICHLOROMETHANE | MR | 13 | 2008 |
| p-Dichlorobenzene | MR | 13 | 2008 |
| Vinyl chloride | MR | 13 | 2008 |
| 1,1-Dichloroethylene | MR | 13 | 2008 |
| trans-1,2-Dichloroethylene | MR | 13 | 2008 |
| 1,1,1-Trichloroethane | MR | 13 | 2008 |
| Carbon tetrachloride | MR | 13 | 2008 |
| 1,2-Dichloropropane | MR | 13 | 2008 |
| Trichloroethylene | MR | 13 | 2008 |
| 1,1,2-Trichloroethane | MR | 13 | 2008 |
| Tetrachloroethylene | MR | 13 | 2008 |
| CHLOROBENZENE | MR | 13 | 2008 |
| Ethylbenzene | MR | 13 | 2008 |
| o-Dichlorobenzene | MR | 13 | 2008 |
| 1,2-Dichloroethane | MR | 13 | 2008 |
| Toluene | MR | 13 | 2008 |
| Styrene | MR | 13 | 2008 |
| Consumer Confidence Rule | Other | 13 | 2023 |
| Xylenes, Total | MR | 13 | 2008 |
| Benzene | MR | 13 | 2008 |
| Nitrate-Nitrite | MR | 7 | 2003 |
| Coliform (TCR) | MCL | 7 | 2005 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.