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Water system · PWSID CA3910005

MANTECA, CITY OF

MANTECA, CA · ~84,928 people served

Check your exact address → MANTECA overview
78
Good
PurityRadar safety score

PWSID

CA3910005

State

California

City

MANTECA

Population served

84,928

Primary source

SWP

Score history

▼ 22 points — the score moved from 100 to 78 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 78

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

PFHxS

Perfluorohexanesulfonic acid

18 ppt

limit 10 ppt

Above EPA limit · 1.8×

PFOA

Perfluorooctanoic acid

7 ppt

limit 4 ppt

Above EPA limit · 1.8×

PFHxA

9.5 ppt

limit —

No federal limit

PFBS

3.9 ppt

limit —

No federal limit

Violations & enforcement

33

Violations on record

0

Unaddressed

32

Health-based

12

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2025. Official EPA record →

Monitoring & reporting · Nitrate began Jan 2024 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jul 2013 Resolved
Max contaminant level (MCL) · Arsenic health-based began Apr 2013 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jan 2013 Resolved
Max contaminant level (MCL) · Arsenic health-based began Oct 2012 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jul 2012 Resolved
Max contaminant level (MCL) · Arsenic health-based began Apr 2012 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jan 2012 Resolved
Max contaminant level (MCL) · Arsenic health-based began Oct 2011 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jul 2011 Resolved
Max contaminant level (MCL) · Arsenic health-based began Apr 2011 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jan 2011 Resolved

Recent enforcement actions

  • State action · SOX Aug 2025
  • State action · SFL Mar 2025
  • State action · SOX Nov 2013
  • State action · SOX Nov 2009
  • State action · SFL Jan 2009
  • State action · SOX Mar 2002
  • State action · SFL Feb 2002
  • State action · SOX Jan 1994

This profile is built from EPA public records for system CA3910005 — 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.