Colstrip Water Quality
Montana
According to EPA SDWIS, Colstrip, Montana is served by 1 community water system covering about 2,350 people. The same extract lists 6 health-based violation records, most recently coded 0200 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Colstrip, Montana is delivered through 1 EPA-regulated community water system serving an estimated 2,350 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 6 violation records across the 1 active community system shown here. Monitoring and reporting records are not present in the extract. The records carry 2 distinct EPA contaminant codes: Surface Water Treatment Rule, TTHM. 2 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Montana drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| COLSTRIP CITY OF | 2,350 | 6 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| COLSTRIP CITY OF | Surface Water Treatment Rule | 2024-07-01 |
| COLSTRIP CITY OF | Surface Water Treatment Rule | 2024-07-01 |
| COLSTRIP CITY OF | Surface Water Treatment Rule | 2024-07-01 |
| COLSTRIP CITY OF | TTHM | 2024-07-01 |
| COLSTRIP CITY OF | TTHM | 2024-07-01 |
| COLSTRIP CITY OF | TTHM | 2024-07-01 |
What are Colstrip's health-based records for?
Colstrip's health-based violation records carry 2 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Surface Water Treatment Rule | 3 | 1 |
| Tthm | 3 | 1 |
TRI Facilities in Colstrip
| Facility | Total Releases |
|---|---|
| Colstrip Steam Electric Station | 46.3M lbs |
| Colstrip Energy LP Rosebud Power Plant | 916.9K lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Colstrip, Montana? ▼
How many water violations does Colstrip have in this EPA extract? ▼
What contaminants were found in Colstrip water? ▼
How many water systems serve Colstrip? ▼
Where does Colstrip get its drinking water? ▼
Are there pollution sources near Colstrip? ▼
How does Colstrip compare in Montana?
Of the 217 Montana places with at least one community water system on file, Colstrip ranks #119 by number of systems (1).
Either side of it: Charlo (1), Clyde Park (1), Cooke City (1), Coram (1)
About This Data
Figures here are the current EPA SDWIS extract joined to the 1 community water system whose service area lists Colstrip, ranked against the 217 Montana places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.