WESTBY TOWN OF
PWS ID: MT0000355 · WESTBY, Montana 59275
Population Served
172
Total Violations
611
Health-Based Violations
81
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 106
- County
- Sheridan
- School/Daycare
- No
- MCL Violations
- 81
- Monitoring Violations
- 524
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 80 | 2015 |
| Arsenic | MR | 27 | 2019 |
| Toxaphene | MR | 9 | 2011 |
| Di(2-ethylhexyl) phthalate | MR | 9 | 2011 |
| Picloram | MR | 9 | 2011 |
| Hexachlorocyclopentadiene | MR | 9 | 2011 |
| Aldicarb sulfone | MR | 9 | 2011 |
| Aldicarb | MR | 9 | 2011 |
| Heptachlor | MR | 9 | 2011 |
| 2,4-D | MR | 9 | 2011 |
| 2,4,5-TP | MR | 9 | 2011 |
| HEXACHLOROBENZENE | MR | 9 | 2011 |
| Benzo(a)pyrene | MR | 9 | 2011 |
| Pentachlorophenol | MR | 9 | 2011 |
| Chlordane | MR | 9 | 2011 |
| Di(2-ethylhexyl) adipate | MR | 9 | 2011 |
| OXAMYL | MR | 9 | 2011 |
| Carbofuran | MR | 9 | 2011 |
| Atrazine | MR | 9 | 2011 |
| Nitrate-Nitrite | MR | 9 | 2013 |
| Endrin | MR | 9 | 2011 |
| BHC-GAMMA | MR | 9 | 2011 |
| Methoxychlor | MR | 9 | 2011 |
| Dalapon | MR | 9 | 2011 |
| Dinoseb | MR | 9 | 2011 |
| LASSO | MR | 9 | 2011 |
| Heptachlor epoxide | MR | 9 | 2011 |
| Aldicarb sulfoxide | MR | 9 | 2011 |
| Simazine | MR | 9 | 2011 |
| 1,2,4-Trichlorobenzene | MR | 7 | 2011 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.