WESTERN MWD - MURRIETA DIVISION

RIVERSIDE, CA · ~17,453 people served

Check your exact address → RIVERSIDE overview

Fair

PurityRadar safety score

PWSID

CA3310036

State

California

City

RIVERSIDE

Population served

17,453

Primary source

SWP

Score history

▼ 36 points — the score moved from 100 to 64 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 64

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

PFOS

Perfluorooctanesulfonic acid

5.7 ppt

limit 4 ppt

Above EPA limit · 1.4×

PFOA

Perfluorooctanoic acid

5.5 ppt

limit 4 ppt

Above EPA limit · 1.4×

PFHxS

Perfluorohexanesulfonic acid

4.1 ppt

limit 10 ppt

Below EPA limit

Lithium

32,000 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Mar 2006. Official EPA record →

Max contaminant level (MCL) · Nitrate health-based began Jan 2006 Resolved

Monitoring & reporting · Nitrate began Oct 2005 Resolved

Monitoring & reporting · Nitrate began Jul 2005 Resolved

Monitoring & reporting · Nitrate began Apr 2005 Resolved

Monitoring & reporting · Total coliform began Jan 2004 Resolved

Max contaminant level (MCL) · Total coliform health-based began Mar 1994 Resolved

Monitoring & reporting · Lead & Copper Rule began Jul 1993 Resolved

Recent enforcement actions

State action · SOX Mar 2006
State action · SFJ Mar 2006
State action · SOX Feb 2004
State action · SIA Feb 2004
EPA/federal action · EOX Mar 2000
EPA/federal action · EF! Sep 1995
State action · SOX Apr 1994
State action · SFJ Mar 1994

This profile is built from EPA public records for system CA3310036 — 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.