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Water system · PWSID CA5010017

PATTERSON, CITY OF

PATTERSON, CA · ~24,977 people served

Check your exact address → PATTERSON overview
100
Excellent
PurityRadar safety score

PWSID

CA5010017

State

California

City

PATTERSON

Population served

24,977

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

Lithium

72,000 ppt

limit —

No federal limit

Violations & enforcement

3

Violations on record

0

Unaddressed

3

Health-based

7

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2007. Official EPA record →

Max contaminant level (MCL) · Nitrate health-based began Jan 2007 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jun 2003 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 1994 Resolved

Recent enforcement actions

  • State action · SOX Jul 2007
  • State action · SFL May 2007
  • State action · SOX Aug 2003
  • State action · SOX Jul 2003
  • State action · SFL Jul 2003
  • State action · SOX Dec 1994
  • State action · SIA Nov 1994

This profile is built from EPA public records for system CA5010017 — 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.