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Water system · PWSID CA1510043

CWS-ONYX WATER SYSTEM

100
Excellent
PurityRadar safety score

PWSID

CA1510043

State

California

City

SAN JOSE

Population served

284

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

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

3

Violations on record

0

Unaddressed

2

Health-based

5

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Mar 2000. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began Oct 1995 Resolved
Max contaminant level (MCL) · Total coliform health-based began Aug 1995 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 1993 Resolved

Recent enforcement actions

  • EPA/federal action · EOX Mar 2000
  • State action · SFJ Nov 1995
  • State action · SOX Oct 1995
  • State action · SFJ Sep 1995
  • State action · SOX Aug 1995

This profile is built from EPA public records for system CA1510043 — 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.