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Water system · PWSID CA2710019

CWSC OAK HILLS

SAN JOSE, CA · ~3,161 people served

Check your exact address → SAN JOSE overview
100
Excellent
PurityRadar safety score

PWSID

CA2710019

State

California

City

SAN JOSE

Population served

3,161

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 Dec 2023). Levels in parts per trillion (ppt).

Lithium

23,800 ppt

limit —

No federal limit

Violations & enforcement

5

Violations on record

0

Unaddressed

2

Health-based

8

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement May 2006. Official EPA record →

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2005 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2005 Resolved
Max contaminant level (MCL) · EPA contaminant 2977 health-based began Apr 1996 Resolved
Max contaminant level (MCL) · EPA contaminant 2977 health-based began Apr 1996 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 1993 Resolved

Recent enforcement actions

  • State action · SOX May 2006
  • State action · SOX Apr 2006
  • State action · SIA Oct 2005
  • State action · SOX Apr 2000
  • State action · SOX Jul 1997
  • State action · SFJ Oct 1996
  • State action · SIA Jul 1996
  • State action · SOX Jul 1996

This profile is built from EPA public records for system CA2710019 — 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.