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Water system · PWSID CA4910017

WINDSOR, TOWN OF

WINDSOR, CA · ~25,561 people served

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

PWSID

CA4910017

State

California

City

WINDSOR

Population served

25,561

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

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

3

Violations on record

0

Unaddressed

2

Health-based

6

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Mar 2018. Official EPA record →

Other began Jan 2008 Resolved
Max contaminant level (MCL) · Total coliform health-based began Aug 2001 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2000 Resolved

Recent enforcement actions

  • State action · SOX Mar 2018
  • State action · SO8 May 2009
  • State action · SOX Sep 2001
  • State action · SFL Sep 2001
  • State action · SFJ Aug 2000
  • State action · SOX Aug 2000

This profile is built from EPA public records for system CA4910017 — 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.