CALIFORNIA WATER SERVICE CO. - DOMINGUEZ

SAN JOSE, CA · ~143,996 people served

Check your exact address → SAN JOSE overview

100

Excellent

PurityRadar safety score

PWSID

CA1910033

State

California

City

SAN JOSE

Population served

143,996

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 Oct 2024). Levels in parts per trillion (ppt).

PFHxS

Perfluorohexanesulfonic acid

3.1 ppt

limit 10 ppt

Below EPA limit

Lithium

44,400 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Monitoring & reporting · Total trihalomethanes (TTHM) began Apr 2018 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Apr 2018 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2018 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2018 Resolved

Monitoring & reporting · Total coliform began Nov 2001 Resolved

Max contaminant level (MCL) · Total coliform health-based began Oct 1995 Resolved

Monitoring & reporting · Total coliform began Sep 1993 Resolved

Recent enforcement actions

State action · SOX Jan 2020
State action · SFJ Aug 2018
State action · SOX Mar 2002
State action · SFJ Mar 2002
EPA/federal action · EOX Mar 2000
State action · SFJ Dec 1995
State action · SOX Dec 1995
EPA/federal action · EOX Dec 1993

This profile is built from EPA public records for system CA1910033 — 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.