RAU SCHOOL DISTRICT NO 21
Montana - Non-Transient Non-Community - PWSID: MT0003089
System Information
| PWSID | MT0003089 |
| System Name | RAU SCHOOL DISTRICT NO 21 |
| System Type | Non-Transient Non-Community |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 08 |
| Serves School | Yes |
| Wholesaler | No |
| First Reported | Feb 7, 1986 |
| Last Reported | Jun 29, 2026 |
Location & Contact
| State | Montana |
| City | SIDNEY |
| ZIP Code | 59270 |
| Address | 12138 CTY RD 350 |
| Organization | MERRITT, LEIGH |
| Phone | 406-482-1088 |
Population & Service
| Population Served | 80 |
| Service Connections | 1 |
Drinking Water Violations (1,091)
This water system has 1,091 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Apr 1, 2025 | - | MR | No | No | - | TT | - | Resolved | Jun 2, 2025 | - | |
| Apr 1, 2025 | - | MR | No | No | - | TT | - | Resolved | Jun 2, 2025 | - | |
| Apr 1, 2025 | - | MR | No | No | - | TT | - | Resolved | Jun 2, 2025 | - | |
| Jul 1, 2024 | - | MR | No | No | - | TT | - | Resolved | Jul 29, 2024 | - | |
| Jul 1, 2024 | - | MR | No | No | - | TT | - | Resolved | Jul 29, 2024 | - | |
| Jul 1, 2024 | - | MR | No | No | - | TT | - | Resolved | Jul 29, 2024 | - | |
| Nov 29, 2023 | - | MR | No | No | - | TT | - | Resolved | Dec 12, 2023 | - | |
| Nov 29, 2023 | - | MR | No | No | - | TT | - | Resolved | Dec 12, 2023 | - | |
| Nov 29, 2023 | - | MR | No | No | - | TT | - | Resolved | Dec 12, 2023 | - | |
| Oct 1, 2022 | Oct 31, 2022 | MON | No | Yes | - | - | - | Resolved | Oct 31, 2022 | - | |
| Oct 1, 2022 | Oct 31, 2022 | MON | No | Yes | - | - | - | Resolved | Oct 31, 2022 | - | |
| Oct 1, 2022 | Oct 31, 2022 | MON | No | Yes | - | - | - | Resolved | Oct 31, 2022 | - | |
| Jul 1, 2022 | - | MR | No | No | - | TT | - | Resolved | Jul 25, 2022 | - | |
| Jul 1, 2022 | - | MR | No | No | - | TT | - | Resolved | Jul 25, 2022 | - | |
| Jul 1, 2022 | - | MR | No | No | - | TT | - | Resolved | Jul 25, 2022 | - | |
| Sep 2, 2021 | - | RPT | No | No | - | - | - | Resolved | Oct 12, 2021 | - | |
| Sep 2, 2021 | - | RPT | No | No | - | - | - | Resolved | Oct 12, 2021 | - | |
| Sep 2, 2021 | - | RPT | No | No | - | - | - | Resolved | Oct 12, 2021 | - | |
| Sep 1, 2021 | Sep 30, 2021 | MON | No | Yes | - | - | - | Resolved | Sep 30, 2021 | - | |
| Sep 1, 2021 | Sep 30, 2021 | MON | No | Yes | - | - | - | Resolved | Sep 30, 2021 | - | |
| Sep 1, 2021 | Sep 30, 2021 | MON | No | Yes | - | - | - | Resolved | Sep 30, 2021 | - | |
| Feb 1, 2021 | Feb 28, 2021 | MON | No | Yes | - | - | - | Resolved | Feb 28, 2021 | - | |
| Feb 1, 2021 | Feb 28, 2021 | MON | No | Yes | - | - | - | Resolved | Feb 28, 2021 | - | |
| Feb 1, 2021 | Feb 28, 2021 | MON | No | Yes | - | - | - | Resolved | Feb 28, 2021 | - | |
| Jan 1, 2021 | Dec 31, 2023 | MR | No | Yes | - | 0.060 mg/L | - | Resolved | Oct 18, 2023 | - | |
| Jan 1, 2021 | Dec 31, 2023 | MR | No | Yes | - | 0.080 mg/L | - | Resolved | Oct 18, 2023 | - | |
| Jan 1, 2021 | Dec 31, 2023 | MR | No | Yes | - | 0.060 mg/L | - | Resolved | Oct 18, 2023 | - | |
| Jan 1, 2021 | Dec 31, 2023 | MR | No | Yes | - | 0.060 mg/L | - | Resolved | Oct 18, 2023 | - | |
| Jan 1, 2021 | Dec 31, 2023 | MR | No | Yes | - | 0.080 mg/L | - | Resolved | Oct 18, 2023 | - | |
| Jan 1, 2021 | Dec 31, 2023 | MR | No | Yes | - | 0.080 mg/L | - | Resolved | Oct 18, 2023 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.003 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.003 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.003 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.003 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.003 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2022 | - |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.