City of Mills

ZipCheckup's reading of EPA records for City of Mills (WY5600036): 3 health-based violations recorded since 2021. City of Mills's EPA record lists 3 historical violations, and none is listed as open in that record; the utility supplies water to 4,050 residents.

Data: EPA SDWIS

System Overview

City of Mills, (EPA ID: WY5600036) is a community water system in Wyoming that serves approximately 4,050 people from surface water sources.

This system provides water to 3 ZIP codes across 2 communities.

ZIP-Area Home Safety Context: C (65/100)

This is the average Home Safety Score for 1 of 3 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.

Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.

Violation History

Status breakdown for accepted records with record years 2021-2026: 3 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

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

3 of 3 ZIP records with known zones are 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 WY or modeled from parcel and building-footprint data.

• 82601 - Casper
• 82604 - Casper
• 82644 - Mills

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for City of Mills (WY5600036) on EPA.gov.

Frequently Asked Questions

Is City of Mills water safe to drink?

The accepted 2026Q2 ECHO snapshot shows no current noncompliance for City of Mills; its 3 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 Mills serve?

City of Mills serves approximately 4,050 people across 3 ZIP codes in Wyoming.

Where does City of Mills get its water?

The primary water source is surface water.

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  author = {{ZipCheckup}},
  title  = {{City of Mills (WY): 3 Health Violations}},
  year   = {n.d.},
  url    = {https://zipcheckup.com/water-system/wy5600036/}
}