TWIN HILLS COLONY INC
Montana — Community Water System — PWSID: MT0003978
System Information
| PWSID | MT0003978 |
| System Name | TWIN HILLS COLONY INC |
| System Type | Community Water System |
| Water Source | Surface Water Purchased |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 14, 2003 |
| Last Reported | Mar 26, 2026 |
Location & Contact
| State | Montana |
| City | CARTER |
| ZIP Code | 59420 |
| Address | 4177 BEAVER SLIDE ROAD |
| Organization | HOFER, JACOB D |
| Phone | 406-734-5280 |
Population & Service
| Population Served | 78 |
| Service Connections | 19 |
Drinking Water Violations (101)
This water system has 101 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec 30, 2024 | — | MR | No | No | — | TT | — | Resolved | Feb 4, 2025 | — | |
| Dec 30, 2024 | — | MR | No | No | — | TT | — | Resolved | Feb 4, 2025 | — | |
| Jul 1, 2024 | Jul 31, 2024 | MR | No | No | — | — | — | Resolved | Jul 31, 2024 | — | |
| Jul 1, 2024 | Jul 31, 2024 | MR | No | No | — | — | — | Resolved | Jul 31, 2024 | — | |
| Jul 1, 2024 | Jul 31, 2024 | MR | No | No | — | — | — | Resolved | Jul 31, 2024 | — | |
| Jun 1, 2024 | Jun 30, 2024 | MR | No | No | — | — | — | Resolved | Jun 30, 2024 | — | |
| Jun 1, 2024 | Jun 30, 2024 | MR | No | No | — | — | — | Resolved | Jun 30, 2024 | — | |
| Jun 1, 2024 | Jun 30, 2024 | MR | No | No | — | — | — | Resolved | Jun 30, 2024 | — | |
| Jan 1, 2024 | Jan 31, 2024 | MON | No | Yes | — | — | — | Resolved | Jan 31, 2024 | — | |
| Jan 1, 2024 | Jan 31, 2024 | MON | No | Yes | — | — | — | Resolved | Jan 31, 2024 | — | |
| Jan 1, 2024 | Jan 31, 2024 | MON | No | Yes | — | — | — | Resolved | Jan 31, 2024 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2022 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2022 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2022 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2022 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2022 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2022 | — | |
| Dec 30, 2021 | — | MR | No | No | — | TT | — | Resolved | Feb 14, 2022 | — | |
| Dec 30, 2021 | — | MR | No | No | — | TT | — | Resolved | Feb 14, 2022 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MCL | Yes | No | 65 UG/L | 0.060 mg/L | 60 | Resolved | Sep 30, 2020 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MCL | Yes | No | 65 UG/L | 0.060 mg/L | 60 | Resolved | Sep 30, 2020 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Sep 30, 2020 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Sep 30, 2020 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Sep 30, 2020 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MCL | Yes | No | 65 UG/L | 0.060 mg/L | 60 | Resolved | Sep 30, 2020 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MCL | Yes | No | 65 UG/L | 0.060 mg/L | 60 | Resolved | Sep 30, 2020 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MCL | Yes | No | 65 UG/L | 0.060 mg/L | 60 | Resolved | Sep 30, 2020 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Sep 30, 2020 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Sep 30, 2020 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Sep 30, 2020 | — | |
| Apr 1, 2020 | Jun 30, 2020 | MCL | Yes | No | 81.8 UG/L | 0.080 mg/L | 80 | Resolved | Jun 30, 2020 | — | |
| Apr 1, 2020 | Jun 30, 2020 | MCL | Yes | No | 81.8 UG/L | 0.080 mg/L | 80 | Resolved | Jun 30, 2020 | — | |
| Apr 1, 2020 | Jun 30, 2020 | MCL | Yes | No | 81.8 UG/L | 0.080 mg/L | 80 | Resolved | Jun 30, 2020 | — | |
| Jan 1, 2020 | Mar 31, 2020 | MCL | Yes | No | 92 UG/L | 0.080 mg/L | 80 | Resolved | Mar 31, 2020 | — | |
| Jan 1, 2020 | Mar 31, 2020 | MCL | Yes | No | 92 UG/L | 0.080 mg/L | 80 | Resolved | Mar 31, 2020 | — | |
| Jan 1, 2020 | Mar 31, 2020 | MCL | Yes | No | 92 UG/L | 0.080 mg/L | 80 | Resolved | Mar 31, 2020 | — | |
| Jan 1, 2020 | Mar 31, 2020 | MCL | Yes | No | 73 UG/L | 0.060 mg/L | 60 | Resolved | Mar 31, 2020 | — | |
| Jan 1, 2020 | Mar 31, 2020 | MCL | Yes | No | 73 UG/L | 0.060 mg/L | 60 | Resolved | Mar 31, 2020 | — | |
| Jan 1, 2020 | Mar 31, 2020 | MCL | Yes | No | 73 UG/L | 0.060 mg/L | 60 | Resolved | Mar 31, 2020 | — | |
| Oct 1, 2019 | Dec 31, 2019 | MCL | Yes | No | 94 UG/L | 0.080 mg/L | 80 | Resolved | Dec 31, 2019 | — | |
| Oct 1, 2019 | Dec 31, 2019 | MCL | Yes | No | 94 UG/L | 0.080 mg/L | 80 | Resolved | Dec 31, 2019 | — | |
| Oct 1, 2019 | Dec 31, 2019 | MCL | Yes | No | 94 UG/L | 0.080 mg/L | 80 | Resolved | Dec 31, 2019 | — | |
| Oct 1, 2019 | Dec 31, 2019 | MCL | Yes | No | 94 UG/L | 0.080 mg/L | 80 | Resolved | Dec 31, 2019 | — | |
| Oct 1, 2019 | Dec 31, 2019 | MCL | Yes | No | 94 UG/L | 0.080 mg/L | 80 | Resolved | Dec 31, 2019 | — | |
| Oct 1, 2019 | Dec 31, 2019 | MCL | Yes | No | 81 UG/L | 0.060 mg/L | 60 | Resolved | Dec 31, 2019 | — | |
| Oct 1, 2019 | Dec 31, 2019 | MCL | Yes | No | 81 UG/L | 0.060 mg/L | 60 | Resolved | Dec 31, 2019 | — | |
| Oct 1, 2019 | Dec 31, 2019 | MCL | Yes | No | 81 UG/L | 0.060 mg/L | 60 | Resolved | Dec 31, 2019 | — | |
| Oct 1, 2019 | Dec 31, 2019 | MCL | Yes | No | 81 UG/L | 0.060 mg/L | 60 | Resolved | Dec 31, 2019 | — | |
| Oct 1, 2019 | Dec 31, 2019 | MCL | Yes | No | 81 UG/L | 0.060 mg/L | 60 | Resolved | Dec 31, 2019 | — | |
| Jul 1, 2019 | — | Other | No | No | — | — | — | Resolved | Jul 25, 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.