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Water system · PWSID OK1021220

STILLWATER UTILITIES AUTHORITY

STILLWATER, OK · ~53,000 people served

Check your exact address → STILLWATER overview
78
Good
PurityRadar safety score

PWSID

OK1021220

State

Oklahoma

City

STILLWATER

Population served

53,000

Primary source

Surface water

Score history

▼ 22 points — the score moved from 100 to 78 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 78

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 Sep 2024). Levels in parts per trillion (ppt).

PFOS

Perfluorooctanesulfonic acid

6.3 ppt

limit 4 ppt

Above EPA limit · 1.6×

PFHxS

Perfluorohexanesulfonic acid

4.1 ppt

limit 10 ppt

Below EPA limit

Lithium

13,000 ppt

limit —

No federal limit

PFHxA

3.2 ppt

limit —

No federal limit

PFPeA

3.2 ppt

limit —

No federal limit

PFBS

3 ppt

limit —

No federal limit

Violations & enforcement

42

Violations on record

0

Unaddressed

25

Health-based

87

Enforcement actions

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

Treatment technique · EPA contaminant 0200 health-based began Feb 2023 Resolved
Treatment technique · EPA contaminant 0200 health-based began Feb 2023 Resolved
Treatment technique · Bromate health-based began Oct 2022 Resolved
Treatment technique · Bromate health-based began Jul 2022 Resolved
Treatment technique · Bromate health-based began Jan 2022 Resolved
Treatment technique · Bromate health-based began Oct 2021 Resolved
Treatment technique · EPA contaminant 0300 health-based began Oct 2018 Resolved
Treatment technique · EPA contaminant 0300 health-based began Oct 2018 Resolved
Treatment technique · EPA contaminant 0300 health-based began Sep 2018 Resolved
Treatment technique · Bromate health-based began Jul 2017 Resolved
Treatment technique · EPA contaminant 0300 health-based began May 2017 Resolved
Treatment technique · Bromate health-based began Apr 2017 Resolved

Recent enforcement actions

  • State action · SIF Jun 2025
  • State action · SOX Apr 2025
  • State action · SIA Mar 2025
  • State action · SIE Mar 2025
  • State action · SIF Feb 2024
  • State action · SOX Feb 2024
  • State action · SOX Nov 2023
  • State action · SFL Oct 2023

This profile is built from EPA public records for system OK1021220 — 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.