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Water system · PWSID OK1010809

DUNCAN PUBLIC UTILITIES AUTHORITY

DUNCAN, OK · ~23,000 people served

Check your exact address → DUNCAN overview
100
Excellent
PurityRadar safety score

PWSID

OK1010809

State

Oklahoma

City

DUNCAN

Population served

23,000

Primary source

Surface water

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Jul 2024). Levels in parts per trillion (ppt).

Lithium

11,200 ppt

limit —

No federal limit

PFBA

5 ppt

limit —

No federal limit

PFPeA

3.7 ppt

limit —

No federal limit

PFHxA

3.3 ppt

limit —

No federal limit

PFHpA

3.1 ppt

limit —

No federal limit

Violations & enforcement

128

Violations on record

0

Unaddressed

113

Health-based

200

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jun 2025. Official EPA record →

Monitoring · Lead & Copper Rule began Nov 2024 Resolved
Monitoring & reporting · EPA contaminant 1006 began Nov 2024 Resolved
Monitoring & reporting · Bromate began Aug 2024 Resolved
Monitoring & reporting · Bromate began Aug 2024 Resolved
Treatment technique · Bromate health-based began Jan 2020 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2019 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2019 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2019 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2019 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2019 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2019 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2019 Resolved

Recent enforcement actions

  • State action · SIF Jun 2025
  • State action · SIF Jun 2025
  • State action · SOX Feb 2025
  • State action · SOX Feb 2025
  • State action · SIE Jan 2025
  • State action · SIA Jan 2025
  • State action · SOX Dec 2024
  • State action · SOX Dec 2024

This profile is built from EPA public records for system OK1010809 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.