POTEAU VALLEY IMPROVEMENT AUTHORITY

WISTER, OK · ~10 people served

Check your exact address → WISTER overview

100

Excellent

PurityRadar safety score

PWSID

OK1020104

State

Oklahoma

City

WISTER

Population served

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

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Resolved

Reporting · EPA contaminant 5200 began Oct 2024 Resolved

Monitoring & reporting · Chlorite began Jan 2024 Resolved

Monitoring & reporting · EPA contaminant 2034 began Jan 2024 Resolved

Monitoring & reporting · EPA contaminant 2050 began Jan 2024 Resolved

Monitoring & reporting · EPA contaminant 1009 began Jun 2023 Resolved

Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jul 2019 Resolved

Treatment technique · EPA contaminant 0200 health-based began Aug 2018 Resolved

Monitoring & reporting · EPA contaminant 0200 began Jul 2017 Resolved

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2013 Resolved

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2010 Resolved

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2009 Resolved

Recent enforcement actions

State action · SO0 Sep 2025
State action · SOX Jul 2025
State action · SOX Jul 2025
State action · SIA Jul 2025
State action · SIA Jul 2025
State action · SO0 Jun 2025
State action · SO0 Jun 2025
State action · SOX Sep 2024

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Nitrate

1 station · latest Jun 2022

0.137 · max 0.191 mg/L · 3

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system OK1020104 — 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.