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Water system · PWSID CA2010001

CHOWCHILLA CITY WATER DEPT

CHOWCHILLA, CA · ~13,916 people served

Check your exact address → CHOWCHILLA overview
89
Excellent
PurityRadar safety score

PWSID

CA2010001

State

California

City

CHOWCHILLA

Population served

13,916

Primary source

Groundwater

Score history

▼ 11 points — the score moved from 100 to 89 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 89

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 Apr 2025). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

4.5 ppt

limit 4 ppt

Above EPA limit · 1.1×

Violations & enforcement

10

Violations on record

0

Unaddressed

6

Health-based

23

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2015. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Jan 2006 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2005 Resolved
Monitoring & reporting · EPA contaminant 4030 began Jan 2001 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 1996 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 1995 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jun 1995 Resolved
Max contaminant level (MCL) · Total coliform health-based began Mar 1995 Resolved
Max contaminant level (MCL) · Total coliform health-based began Mar 1994 Resolved
Max contaminant level (MCL) · Total coliform health-based began Aug 1993 Resolved
Max contaminant level (MCL) · Total coliform health-based began Apr 1993 Resolved

Recent enforcement actions

  • State action · SOX Sep 2015
  • State action · SIA Mar 2015
  • State action · SOX Apr 2008
  • State action · SIA Apr 2008
  • State action · SFL Dec 2005
  • State action · SOX Dec 2005
  • State action · SOX Oct 2005
  • State action · SOX May 2002

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

1 station · latest May 2023

0.393 · max 0.393 mg/l as N · 2

Arsenic

1 station · latest May 2023

2.4 · max 2.4 ug/l · 1

Fluoride

1 station · latest May 2023

0.14 · max 0.14 mg/l · 1

Lead

1 station · latest May 2023

0.617 · max 0.617 ug/l · 1

Manganese

1 station · latest May 2023

3.36 · max 3.36 ug/l · 1

Uranium

1 station · latest May 2023

0.201 · max 0.201 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 CA2010001 — 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.