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Water system · PWSID CA0410002

CAL-WATER SERVICE CO.-CHICO

SAN JOSE, CA · ~114,925 people served

Check your exact address → SAN JOSE overview
45
Fair
PurityRadar safety score

PWSID

CA0410002

State

California

City

SAN JOSE

Population served

114,925

Primary source

Groundwater

Score history

▼ 55 points — the score moved from 100 to 45 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 45

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

PFOA

Perfluorooctanoic acid

6.8 ppt

limit 4 ppt

Above EPA limit · 1.7×

PFOS

Perfluorooctanesulfonic acid

5.6 ppt

limit 4 ppt

Above EPA limit · 1.4×

PFHxS

Perfluorohexanesulfonic acid

8.9 ppt

limit 10 ppt

Near EPA limit

Lithium

11,700 ppt

limit —

No federal limit

PFHxA

6 ppt

limit —

No federal limit

PFPeA

5.3 ppt

limit —

No federal limit

PFBS

3 ppt

limit —

No federal limit

Violations & enforcement

5

Violations on record

0

Unaddressed

5

Health-based

13

Enforcement actions

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

Max contaminant level (MCL) · Total coliform health-based began Sep 2002 Resolved
Max contaminant level (MCL) · EPA contaminant 2987 health-based began Dec 1998 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 1992 Resolved
Max contaminant level (MCL) · Total coliform health-based began Oct 1992 Resolved
Max contaminant level (MCL) · Total coliform health-based began Sep 1992 Resolved

Recent enforcement actions

  • State action · SOX Feb 2018
  • State action · SIA Nov 2003
  • State action · SOX Oct 2002
  • State action · SIE Sep 2002
  • EPA/federal action · EOX Mar 2000
  • State action · SIE Dec 1998
  • State action · SOX Aug 1995
  • EPA/federal action · EOX Dec 1993

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Nitrate

2 stations · latest Aug 2021

0.582 · max 0.765 mg/l as N · 4

Arsenic

2 stations · latest Aug 2021

0.565 · max 0.75 ug/l · 2

Fluoride

2 stations · latest Aug 2021

0.055 · max 0.07 mg/l · 2

Uranium

2 stations · latest Aug 2021

0.255 · max 0.376 ug/l · 2

Copper

1 station · latest Aug 2021

0.7 · max 0.7 ug/l · 1

Lead

1 station · latest Aug 2021

0.134 · max 0.134 ug/l · 1

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system CA0410002 — 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.