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Water system · PWSID OK2005501

NICHOLS HILLS

NICHOLS HILLS, OK · ~4,020 people served

Check your exact address → NICHOLS HILLS overview
100
Excellent
PurityRadar safety score

PWSID

OK2005501

State

Oklahoma

City

NICHOLS HILLS

Population served

4,020

Primary source

Groundwater

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 Sep 2025). Levels in parts per trillion (ppt).

Lithium

16,000 ppt

limit —

No federal limit

Violations & enforcement

90

Violations on record

0

Unaddressed

20

Health-based

81

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Nov 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 · EPA contaminant 2034 began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2015 began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2032 began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2033 began Jan 2024 Resolved
Monitoring & reporting · Thallium began Jan 2024 Resolved
Monitoring & reporting · Thallium began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2005 began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2010 began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2031 began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2020 began Jan 2024 Resolved

Recent enforcement actions

  • State action · SOX Nov 2025
  • State action · SOX Nov 2025
  • State action · SOX Sep 2025
  • State action · SOX Sep 2025
  • State action · SOX Jul 2025
  • State action · SOX Jul 2025
  • State action · SIA Jul 2025
  • State action · SIA Jul 2025

This profile is built from EPA public records for system OK2005501 — 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.