RAU SCHOOL DISTRICT NO 21
PWS ID: MT0003089 · SIDNEY, Montana 59270
Population Served
80
Total Violations
1,091
Health-Based Violations
24
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 1
- County
- Richland
- School/Daycare
- Yes
- MCL Violations
- 12
- Monitoring Violations
- 1,014
- Treatment Tech Violations
- 12
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 170 | 2025 |
| Coliform (TCR) | MR | 64 | 2015 |
| Endrin | MR | 25 | 2020 |
| Dinoseb | MR | 25 | 2020 |
| BHC-GAMMA | MR | 25 | 2020 |
| Heptachlor | MR | 25 | 2020 |
| Toxaphene | MR | 25 | 2020 |
| Simazine | MR | 25 | 2020 |
| Chlordane | MR | 25 | 2020 |
| 2,4,5-TP | MR | 25 | 2020 |
| Heptachlor epoxide | MR | 25 | 2020 |
| Pentachlorophenol | MR | 25 | 2020 |
| Hexachlorocyclopentadiene | MR | 25 | 2020 |
| Methoxychlor | MR | 25 | 2020 |
| LASSO | MR | 25 | 2020 |
| HEXACHLOROBENZENE | MR | 25 | 2020 |
| Picloram | MR | 25 | 2020 |
| Benzo(a)pyrene | MR | 25 | 2020 |
| Dalapon | MR | 25 | 2020 |
| Di(2-ethylhexyl) adipate | MR | 25 | 2020 |
| Atrazine | MR | 25 | 2020 |
| 2,4-D | MR | 25 | 2020 |
| OXAMYL | MR | 22 | 2020 |
| Carbofuran | MR | 22 | 2020 |
| Di(2-ethylhexyl) phthalate | MR | 22 | 2020 |
| Arsenic | MR | 21 | 2009 |
| Revised Total Coliform Rule | MON | 21 | 2022 |
| Nitrate-Nitrite | MR | 16 | 2017 |
| Revised Total Coliform Rule | RPT | 15 | 2021 |
| Lead and Copper Rule | TT | 12 | 2017 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.