Water Quality in 73533 — Duncan, OK

Data source: U.S. Environmental Protection Agency (EPA) SDWIS Last verified: March 16, 2026

Your Water System

ZIP code 73533 in Duncan, Oklahoma is served by DUNCAN PUBLIC UTILITIES AUTHORITY (EPA ID: OK1010809). This system provides water to approximately 23,000 people from surface water sources.

Lead & Copper in Your Water

No Lead & Copper Rule sampling data available for systems serving this ZIP code.

Violation Summary

Recent Violations

Contaminants Detected

The following contaminants have been flagged in EPA records for water systems serving this ZIP code:

What You Can Do

1. Request your water system’s Consumer Confidence Report (CCR) — Your utility is required to publish this annually
2. Consider a home water test — Independent testing can reveal issues in your specific plumbing
3. Install a certified water filter — NSF-certified filters can address specific contaminants
4. Contact your water provider — Ask about current treatment and any ongoing remediation

Other Water Quality Reports in Oklahoma

• 73002 (Alex) — 104 violations
• 73003 (Edmond) — 84 violations
• 73004 (Amber) — 304 violations
• 73005 (Anadarko) — 86 violations
• 73006 (Apache) — 84 violations
• 73007 (Arcadia) — 31 violations
• 73008 (Bethany) — 25 violations
• 73009 (Binger) — 17 violations
• 73010 (Blanchard) — 39 violations
• 73011 (Bradley) — 307 violations
• 73014 (Calumet) — 57 violations
• 73015 (Carnegie) — 6 violations
• 73016 (Cashion) — 4 violations
• 73017 (Cement) — 10 violations
• 73018 (Chickasha) — 50 violations
• 73019 (Norman) — 146 violations
• 73020 (Choctaw) — 108 violations
• 73021 (Colony) — 2 violations
• 73030 (Davis) — 42 violations
• 73085 (Yukon) — 201 violations

Nearby Water Quality Reports

• 73501 (Lawton) — 25 mi — 23 violations
• 73011 (Bradley) — 28 mi — 307 violations
• 73017 (Cement) — 32 mi — 10 violations
• 73002 (Alex) — 33 mi — 104 violations
• 73018 (Chickasha) — 36 mi — 50 violations

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 the tap water in 73533 safe to drink?

Duncan’s water system has recorded 16 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.

Where does 73533’s water come from?

The primary water source for this area is surface water. DUNCAN PUBLIC UTILITIES AUTHORITY serves approximately 23,000 people.

How can I get my water tested?

Contact your local water utility for a free water quality report, or hire a certified lab for independent home water testing. The EPA recommends testing annually if you use a private well.

Does 73533 have lead in the water?

No Lead and Copper Rule sampling data is currently available in EPA records for water systems serving ZIP code 73533. If you are concerned about lead, contact your water utility or have your tap water independently tested.

What is the radon risk in 73533?

Radon zone data is not available for ZIP code 73533. The EPA recommends testing all homes for radon regardless of location, as radon levels can vary significantly even within the same neighborhood.