BIG SKY COAL COMPANY COLSTRIP
Montana — Non-Transient Non-Community — PWSID: MT0001657
System Information
| PWSID | MT0001657 |
| System Name | BIG SKY COAL COMPANY COLSTRIP |
| System Type | Non-Transient Non-Community |
| Water Source | Ground Water |
| Activity Status | Non-Inventory |
| Owner Type | Private |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 5, 1980 |
| Last Reported | Jan 5, 2026 |
Location & Contact
| State | Montana |
| City | COLSTRIP |
| ZIP Code | 59323 |
| Address | PO BOX 97 |
| Organization | — |
| Phone | 406-748-5768 |
Population & Service
| Population Served | 57 |
| Service Connections | 3 |
Drinking Water Violations (22)
This water system has 22 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 31, 2004 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 3, 2005 | Lead and Copper Rule |
| Oct 1, 2004 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 3, 2005 | Lead and Copper Rule |
| Oct 1, 2004 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 3, 2005 | Lead and Copper Rule |
| Oct 1, 2004 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 3, 2005 | Lead and Copper Rule |
| Jan 1, 2004 | Jan 31, 2004 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jan 31, 2004 | Total Coliform Rule |
| Jan 1, 2004 | Jan 31, 2004 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jan 31, 2004 | Total Coliform Rule |
| Jan 1, 2004 | Jan 31, 2004 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jan 31, 2004 | Total Coliform Rule |
| Jan 1, 2004 | Jan 31, 2004 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jan 31, 2004 | Total Coliform Rule |
| Jan 1, 2004 | Dec 31, 2004 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2004 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2004 | Dec 31, 2004 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2004 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2004 | Dec 31, 2004 | Nitrate-Nitrite | MR | No | Yes | — | — | — | Resolved | Dec 31, 2004 | Nitrate Rule |
| Jan 1, 2002 | Dec 31, 2004 | Selenium | MR | No | Yes | — | 0.05 mg/L | — | Resolved | Dec 31, 2004 | Inorganic Chemicals |
| Jan 1, 2002 | Dec 31, 2004 | Mercury | MR | No | Yes | — | 0.002 mg/L | — | Resolved | Dec 31, 2004 | Inorganic Chemicals |
| Jan 1, 2002 | Dec 31, 2004 | Thallium, Total | MR | No | Yes | — | 0.002 mg/L | — | Resolved | Dec 31, 2004 | Inorganic Chemicals |
| Jan 1, 2002 | Dec 31, 2004 | Beryllium, Total | MR | No | Yes | — | 0.004 mg/L | — | Resolved | Dec 31, 2004 | Inorganic Chemicals |
| Jan 1, 2002 | Dec 31, 2004 | Antimony, Total | MR | No | Yes | — | 0.006 mg/L | — | Resolved | Dec 31, 2004 | Inorganic Chemicals |
| Jan 1, 2002 | Dec 31, 2004 | Nickel | MR | No | Yes | — | — | — | Resolved | Dec 31, 2004 | Inorganic Chemicals |
| Jan 1, 2002 | Dec 31, 2004 | Fluoride | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2004 | Inorganic Chemicals |
| Jan 1, 2002 | Dec 31, 2004 | Chromium | MR | No | Yes | — | 0.1 mg/L | — | Resolved | Dec 31, 2004 | Inorganic Chemicals |
| Jan 1, 2002 | Dec 31, 2004 | Cadmium | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Dec 31, 2004 | Inorganic Chemicals |
| Jan 1, 2002 | Dec 31, 2004 | Barium | MR | No | Yes | — | 2 mg/L | — | Resolved | Dec 31, 2004 | Inorganic Chemicals |
| Jan 1, 1981 | Jan 31, 1981 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Jan 31, 1981 | Nitrate Rule |
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.