HARRISON SCHOOL DISTRICT NO 23
PWS ID: MT0003790 · HARRISON, Montana 59735
Population Served
100
Total Violations
1,139
Health-Based Violations
1
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 1
- County
- Madison
- School/Daycare
- Yes
- MCL Violations
- 1
- Monitoring Violations
- 1,138
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Di(2-ethylhexyl) phthalate | MR | 39 | 2020 |
| Revised Total Coliform Rule | MON | 26 | 2025 |
| Endrin | MR | 24 | 2020 |
| Dalapon | MR | 24 | 2020 |
| Di(2-ethylhexyl) adipate | MR | 24 | 2020 |
| OXAMYL | MR | 24 | 2020 |
| Picloram | MR | 24 | 2020 |
| Dinoseb | MR | 24 | 2020 |
| Hexachlorocyclopentadiene | MR | 24 | 2020 |
| Heptachlor | MR | 24 | 2020 |
| HEXACHLOROBENZENE | MR | 24 | 2020 |
| Benzo(a)pyrene | MR | 24 | 2020 |
| Pentachlorophenol | MR | 24 | 2020 |
| Chlordane | MR | 24 | 2020 |
| BHC-GAMMA | MR | 24 | 2020 |
| Toxaphene | MR | 24 | 2020 |
| Simazine | MR | 24 | 2020 |
| Carbofuran | MR | 24 | 2020 |
| Heptachlor epoxide | MR | 24 | 2020 |
| 2,4-D | MR | 24 | 2020 |
| 2,4,5-TP | MR | 24 | 2020 |
| LASSO | MR | 24 | 2020 |
| Methoxychlor | MR | 24 | 2020 |
| Atrazine | MR | 24 | 2020 |
| cis-1,2-Dichloroethylene | MR | 21 | 2020 |
| Xylenes, Total | MR | 21 | 2020 |
| Vinyl chloride | MR | 21 | 2020 |
| 1,1-Dichloroethylene | MR | 21 | 2020 |
| trans-1,2-Dichloroethylene | MR | 21 | 2020 |
| 1,2-Dichloroethane | MR | 21 | 2020 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.