Duncan Public Utilities Authority

ZipCheckup's reading of EPA SDWIS for Duncan Public Utilities Authority (OK1010809): 5 past health-based violations, since resolved. Records for Duncan Public Utilities Authority show 11 violations over the monitored period, with every finding addressed and officially closed - the provider, which serves approximately 23,000 people, carries no outstanding enforcement actions in the current EPA dataset and meets all applicable drinking water requirements.

Data: EPA SDWIS

System Overview

Duncan Public Utilities Authority (EPA ID: OK1010809) is a community water system in Oklahoma that serves approximately 23,000 people from surface water sources.

This system serves ZIP code 73533 in Duncan.

Violation History

Status breakdown for accepted records with record years 2021-2026: 5 resolved, 6 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

Chlorite (EPA limit: 1 mg/L)

Anemia and nervous system effects in infants and children At-risk groups: infants, developing fetuses, people with G6PD deficiency.

Removal methods: ferrous sulfate reduction, activated carbon, reverse osmosis. Find the right filter →

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 →

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.

• 73533 - Duncan

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Duncan Public Utilities Authority (OK1010809) on EPA.gov.

Frequently Asked Questions

Is Duncan Public Utilities Authority water safe to drink?

The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Duncan Public Utilities Authority; its 11 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.

How many people does Duncan Public Utilities Authority serve?

Duncan Public Utilities Authority serves approximately 23,000 people across 1 ZIP code in Oklahoma.

Where does Duncan Public Utilities Authority get its water?

The primary water source is surface water.

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  author = {{ZipCheckup}},
  title  = {{Duncan Public Utilities Authority (OK): 5 Health Violations}},
  year   = {n.d.},
  url    = {https://zipcheckup.com/water-system/ok1010809/}
}