DUNCAN RANCH COLONY
PWS ID: MT0000418 · HARLOWTON, Montana 59036
Population Served
96
Total Violations
252
Health-Based Violations
31
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 17
- County
- Wheatland
- School/Daycare
- No
- MCL Violations
- 31
- Monitoring Violations
- 211
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 43 | 2011 |
| Coliform (TCR) | MCL | 31 | 2014 |
| Lead and Copper Rule | MR | 12 | 2021 |
| E. COLI | MR | 12 | 2012 |
| Consumer Confidence Rule | Other | 6 | 2019 |
| Barium | MR | 4 | 1999 |
| Chromium | MR | 4 | 1999 |
| Mercury | MR | 4 | 1999 |
| Cadmium | MR | 4 | 1999 |
| Selenium | MR | 4 | 1999 |
| Fluoride | MR | 4 | 1999 |
| Arsenic | MR | 4 | 1999 |
| Endrin | MR | 3 | 1999 |
| BHC-GAMMA | MR | 3 | 1999 |
| Dalapon | MR | 3 | 1999 |
| Diquat | MR | 3 | 1999 |
| Endothall | MR | 3 | 1999 |
| OXAMYL | MR | 3 | 1999 |
| Simazine | MR | 3 | 1999 |
| Dinoseb | MR | 3 | 1999 |
| Hexachlorocyclopentadiene | MR | 3 | 1999 |
| Carbofuran | MR | 3 | 1999 |
| Aldicarb | MR | 3 | 1999 |
| LASSO | MR | 3 | 1999 |
| 2,3,7,8-TCDD | MR | 3 | 1999 |
| Heptachlor | MR | 3 | 1999 |
| Heptachlor epoxide | MR | 3 | 1999 |
| 2,4,5-TP | MR | 3 | 1999 |
| HEXACHLOROBENZENE | MR | 3 | 1999 |
| Pentachlorophenol | MR | 3 | 1999 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.