Blackwell Municipal Authority

ZipCheckup's reading of EPA SDWIS for Blackwell Municipal Authority (OK1021101): 10 past health-based violations, since resolved. Despite the 13 historical violations in its record, Blackwell Municipal Authority has cleared every one and now meets EPA standards serving 7,668 residents.

Data: EPA SDWIS

System Overview

Blackwell Municipal Authority (EPA ID: OK1021101) is a community water system in Oklahoma that serves approximately 7,668 people from surface water sources.

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

ZIP-Area Home Safety Context: A (87/100)

This is the average Home Safety Score for 1 of 2 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: 13 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)

Cancer risk; reproductive & developmental effects At-risk groups: pregnant women, infants, long-term consumers of chlorinated municipal water.

Removal methods: granular activated carbon (GAC), carbon block filter, reverse osmosis. Find the right filter →

E. coli (EPA limit: Zero tolerance (any positive sample triggers immediate action))

Severe GI illness; potentially fatal kidney failure in children At-risk groups: children under 5, elderly, immunocompromised individuals, pregnant women.

Removal methods: UV disinfection (99.99%), chlorination, 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

Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)

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 OK or modeled from parcel and building-footprint data.

• 74631 - Blackwell
• 74646 - Nardin

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Blackwell Municipal Authority (OK1021101) on EPA.gov.

Frequently Asked Questions

Is Blackwell Municipal Authority water safe to drink?

The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Blackwell Municipal Authority; its 13 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.

How many people does Blackwell Municipal Authority serve?

Blackwell Municipal Authority serves approximately 7,668 people across 2 ZIP codes in Oklahoma.

Where does Blackwell Municipal Authority get its water?

The primary water source is surface water.

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  author = {{ZipCheckup}},
  title  = {{Blackwell Municipal Authority (OK): 10 Health Violations}},
  year   = {n.d.},
  url    = {https://zipcheckup.com/water-system/ok1021101/}
}