CALIFORNIA WATER SERVICE - SAN CARLOS

SAN JOSE, CA · ~35,344 people served

Check your exact address → SAN JOSE overview

100

Excellent

PurityRadar safety score

PWSID

CA4110007

State

California

City

SAN JOSE

Population served

35,344

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

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

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Nov 2016. Official EPA record →

Treatment technique · EPA contaminant 0200 health-based began Mar 2015 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jun 1996 Resolved

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

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

Recent enforcement actions

State action · SOX Nov 2016
State action · SFL Apr 2015
State action · SOX Jul 1996
State action · SFJ Jul 1996
State action · SOX Jan 1996
State action · SIA Jan 1996
State action · SFL Jun 1993
State action · SOX Mar 1992

This profile is built from EPA public records for system CA4110007 — 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.