CALIFORNIA WATER SERVICE-S SAN FRANCISCO

SAN JOSE, CA · ~64,146 people served

Check your exact address → SAN JOSE overview

100

Excellent

PurityRadar safety score

PWSID

CA4110009

State

California

City

SAN JOSE

Population served

64,146

Primary source

SWP

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

Lithium

23,600 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jan 2019. Official EPA record →

Monitoring & reporting · EPA contaminant 3014 began Jun 2013 Resolved

Treatment technique · EPA contaminant 0200 health-based began Jun 1993 Resolved

Max contaminant level (MCL) · Total coliform health-based began Oct 1992 Resolved

Recent enforcement actions

State action · SOX Jan 2019
State action · SFL Aug 2013
State action · SOX Aug 2013
State action · SOX May 2009
EPA/federal action · EOX Dec 2003
State action · SOX Apr 2000
State action · SOX Nov 1998
State action · SFL Jun 1993

This profile is built from EPA public records for system CA4110009 — 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.