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Water system · PWSID CA3310037

CORONA, CITY OF

CORONA, CA · ~168,575 people served

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

PWSID

CA3310037

State

California

City

CORONA

Population served

168,575

Primary source

SWP

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

PFHxS

Perfluorohexanesulfonic acid

3.3 ppt

limit 10 ppt

Below EPA limit

Lithium

30,900 ppt

limit —

No federal limit

PFBA

7.6 ppt

limit —

No federal limit

PFHxA

3.8 ppt

limit —

No federal limit

PFPeA

3.6 ppt

limit —

No federal limit

Violations & enforcement

9

Violations on record

0

Unaddressed

3

Health-based

22

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Oct 2022. Official EPA record →

Monitoring & reporting · Haloacetic acids (HAA5) began Apr 2022 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Apr 2022 Resolved
Monitoring & reporting · Total coliform began Aug 2014 Resolved
Other began Jul 2004 Resolved
Other began Nov 2003 Resolved
Max contaminant level (MCL) · Nitrate health-based began Jun 2001 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 1997 Resolved
Treatment technique · EPA contaminant 0200 health-based began Jul 1993 Resolved
Max contaminant level (MCL) · Nitrate health-based began Jan 1993 Resolved

Recent enforcement actions

  • State action · SFL Oct 2022
  • State action · SOX Sep 2022
  • State action · SFJ Sep 2014
  • State action · SOX Sep 2014
  • State action · SIA Oct 2004
  • State action · SOX Aug 2004
  • State action · SOX Jun 2004
  • State action · SOX Jan 2004

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

2 stations · latest May 2022

9.99 · max 10.1 mg/l as N · 4

Arsenic

2 stations · latest May 2022

2.2 · max 2.5 ug/l · 2

Fluoride

2 stations · latest May 2022

0.345 · max 0.37 mg/l · 2

Uranium

2 stations · latest May 2022

4.22 · max 6.3 ug/l · 2

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 CA3310037 — 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.