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Water system · PWSID CA4910011

SEBASTOPOL, CITY OF

SEBASTOPOL, CA · ~7,522 people served

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

PWSID

CA4910011

State

California

City

SEBASTOPOL

Population served

7,522

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

Lithium

9,000 ppt

limit —

No federal limit

Violations & enforcement

9

Violations on record

0

Unaddressed

9

Health-based

8

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2009. Official EPA record →

Max contaminant level (MCL) · Arsenic health-based began Oct 2009 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jul 2009 Resolved
Max contaminant level (MCL) · Arsenic health-based began Apr 2009 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jan 2009 Resolved
Max contaminant level (MCL) · Arsenic health-based began Oct 2008 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jul 2008 Resolved
Max contaminant level (MCL) · Total coliform health-based began May 2008 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 2006 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 1999 Resolved

Recent enforcement actions

  • State action · SOX Dec 2009
  • State action · SFL Jan 2009
  • State action · SOX Jun 2008
  • State action · SFL Jun 2008
  • State action · SOX Dec 2006
  • State action · SFL Dec 2006
  • State action · SFJ Dec 1999
  • State action · SOX Dec 1999

This profile is built from EPA public records for system CA4910011 — 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.