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Water system · PWSID CA5400718

WILLIAMS MUTUAL WATER COMPANY

PORTERVILLE, CA · ~165 people served

Check your exact address → PORTERVILLE overview
85
Excellent
PurityRadar safety score

PWSID

CA5400718

State

California

City

PORTERVILLE

Population served

165

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 85 Jun 18, 2026 · score 85

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

20

Violations on record

2

Unaddressed

1

Health-based

33

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jan 2020. Official EPA record →

Reporting · EPA contaminant 5200 began Oct 2024 Unaddressed
Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Unaddressed
Monitoring · Lead & Copper Rule began May 2018 Resolved
Other · EPA contaminant 7000 began Jul 2016 Resolved
Monitoring & reporting · Thallium began Jan 2015 Resolved
Other · EPA contaminant 7000 began Jul 2011 Resolved
Monitoring & reporting · Total coliform began Jun 2011 Resolved
Monitoring & reporting · Total coliform began Apr 2010 Resolved
Monitoring & reporting · Nitrate began Jan 2010 Resolved
Monitoring & reporting · Total coliform began May 2008 Resolved
Monitoring & reporting · Nitrate began Jan 2008 Resolved
Monitoring & reporting · Nitrate began Jan 2007 Resolved

Recent enforcement actions

  • State action · SOX Jan 2020
  • State action · SFL Jun 2018
  • State action · SOX Feb 2017
  • State action · SFL Feb 2017
  • State action · SOX Jun 2016
  • State action · SFL Feb 2016
  • State action · SOX Jul 2012
  • State action · SFO Sep 2011

This profile is built from EPA public records for system CA5400718 — 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.