City of Colstrip

ZipCheckup's reading of EPA records for City of Colstrip (MT0000180): 2 health-based violations recorded since 2021. Per the federal file, all 8 violations logged for City of Colstrip carry a resolved status, and around 2,350 people get water from this system.

Data: EPA SDWIS

System Overview

City of Colstrip (EPA ID: MT0000180) is a community water system in Montana that serves approximately 2,350 people from surface water sources.

This system serves ZIP code 59323 in Colstrip.

Violation History

Status breakdown for accepted records with record years 2021-2026: 8 resolved, 0 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.

Recent Violations

Contaminants Detected

The following contaminants have been flagged in EPA records for this water system:

Health Risk Details

E. coli (EPA limit: MCLG of zero; positive samples require repeat testing under the Revised Total Coliform Rule)

Some E. coli strains can cause severe GI illness and kidney failure, especially in children At-risk groups: children under 5, elderly, immunocompromised individuals, pregnant women.

Treatment options (verify a product is certified to reduce this contaminant): UV disinfection, chlorination, reverse osmosis. Find the right filter →

Haloacetic Acids (HAA5) (EPA limit: 0.06 mg/L)

Increased risk of cancer

Treatment options (verify a product is certified to reduce this contaminant): granular activated carbon (GAC), carbon block filter, reverse osmosis. Find the right filter →

Lead & Copper

EPA Lead and Copper Rule evidence attributed directly to this water system:

No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.

Radon Risk in Service Area

1 of 1 ZIP records with known zones is in EPA Radon Zone 1.

The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.

ZIP Codes Served

Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by MT or modeled from parcel and building-footprint data.

• 59323 - Colstrip

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for City of Colstrip (MT0000180) on EPA.gov.

Frequently Asked Questions

Is City of Colstrip water safe to drink?

The accepted 2026Q2 ECHO snapshot shows no current noncompliance for City of Colstrip; its 8 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.

How many people does City of Colstrip serve?

City of Colstrip serves approximately 2,350 people across 1 ZIP code in Montana.

Where does City of Colstrip get its water?

The primary water source is surface water.

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  author = {{ZipCheckup}},
  title  = {{City of Colstrip (MT): 2 Health Violations}},
  year   = {n.d.},
  url    = {https://zipcheckup.com/water-system/mt0000180/}
}