ISLAND MOUNTAIN DEVELOPMENT GROUP
Montana - Non-Transient Non-Community - PWSID: 083090040
System Information
| PWSID | 083090040 |
| System Name | ISLAND MOUNTAIN DEVELOPMENT GROUP |
| System Type | Non-Transient Non-Community |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Native American |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 16, 2018 |
| Last Reported | Jun 29, 2026 |
Location & Contact
| State | Montana |
| City | HAYS |
| ZIP Code | 59527 |
| Address | 353 Old Hays Rd. |
| Organization | EREAUX, DELVIN |
| Phone | 406-673-3031 |
Population & Service
| Population Served | 150 |
| Service Connections | 1 |
Drinking Water Violations (7)
This water system has 7 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Nov 28, 2025 | - | MR | No | Yes | - | - | - | Resolved | Jan 22, 2026 | - | |
| Sep 7, 2023 | - | TT | Yes | No | - | - | - | Resolved | Apr 29, 2024 | - | |
| Jan 1, 2023 | Dec 31, 2023 | MR | No | Yes | - | - | - | Resolved | Dec 31, 2023 | - | |
| Dec 30, 2021 | - | MR | No | No | - | TT | - | Resolved | Mar 16, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.1 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Feb 1, 2019 | Feb 28, 2019 | MON | No | Yes | - | - | - | Resolved | Feb 28, 2019 | - | |
| Feb 1, 2019 | Feb 28, 2019 | MON | No | Yes | - | - | - | Resolved | Feb 28, 2019 | - |
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.