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Water system · PWSID CA3910007

RIPON, CITY OF

RIPON, CA · ~15,741 people served

Check your exact address → RIPON overview
53
Fair
PurityRadar safety score

PWSID

CA3910007

State

California

City

RIPON

Population served

15,741

Primary source

Groundwater

Score history

▼ 47 points — the score moved from 100 to 53 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 53

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

PFOS

Perfluorooctanesulfonic acid

12 ppt

limit 4 ppt

Above EPA limit · 3.0×

PFOA

Perfluorooctanoic acid

5 ppt

limit 4 ppt

Above EPA limit · 1.3×

PFHxS

Perfluorohexanesulfonic acid

3.3 ppt

limit 10 ppt

Below EPA limit

Lithium

9,070 ppt

limit —

No federal limit

Violations & enforcement

14

Violations on record

0

Unaddressed

10

Health-based

22

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jun 2018. Official EPA record →

Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2014 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Oct 2014 Resolved
Other · EPA contaminant 7000 began Jul 2010 Resolved
Max contaminant level (MCL) · Nitrate health-based began Dec 2001 Resolved
Max contaminant level (MCL) · EPA contaminant 2987 health-based began Jul 2001 Resolved
Max contaminant level (MCL) · Total coliform health-based began Dec 2000 Resolved
Max contaminant level (MCL) · Total coliform health-based began Sep 2000 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 1999 Resolved
Max contaminant level (MCL) · Total coliform health-based began Sep 1999 Resolved
Max contaminant level (MCL) · Total coliform health-based began Dec 1997 Resolved
Monitoring & reporting · Total coliform began Jun 1997 Resolved
Max contaminant level (MCL) · Total coliform health-based began Oct 1995 Resolved

Recent enforcement actions

  • State action · SOX Jun 2018
  • State action · SIA Mar 2015
  • State action · SFL Oct 2010
  • State action · SOX Sep 2010
  • State action · SOX Feb 2002
  • State action · SFL Feb 2002
  • State action · SOX Oct 2001
  • State action · SFL Sep 2001

This profile is built from EPA public records for system CA3910007 — 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.