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Water system · PWSID CA1010007

CITY OF FRESNO

FRESNO, CA · ~545,716 people served

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Fair

PurityRadar safety score

PWSID

CA1010007

State

California

City

FRESNO

Population served

545,716

Primary source

Surface water

Score history

▼ 35 points — the score moved from 100 to 65 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 65

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

PFOA

Perfluorooctanoic acid

6.1 ppt

limit 4 ppt

Above EPA limit · 1.5×

PFOS

Perfluorooctanesulfonic acid

4.9 ppt

limit 4 ppt

Above EPA limit · 1.2×

PFNA

Perfluorononanoic acid

4.7 ppt

limit 10 ppt

Below EPA limit

PFHxS

Perfluorohexanesulfonic acid

4 ppt

limit 10 ppt

Below EPA limit

PFPeA

10 ppt

limit —

No federal limit

PFBA

7.8 ppt

limit —

No federal limit

PFHxA

7.7 ppt

limit —

No federal limit

PFPeS

4.7 ppt

limit —

No federal limit

PFHpA

3.8 ppt

limit —

No federal limit

PFBS

3.5 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2017. Official EPA record →

Monitoring & reporting · Nitrate began Jan 2016 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2010 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Oct 2010 Resolved

Monitoring & reporting · Bromate began Oct 2010 Resolved

Max contaminant level (MCL) · EPA contaminant 2931 health-based began Dec 2009 Resolved

Monitoring & reporting · Nitrate began Feb 1997 Resolved

Max contaminant level (MCL) · Nitrate health-based began Jan 1997 Resolved

Monitoring & reporting · Total coliform began Apr 1994 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jun 1993 Resolved

Max contaminant level (MCL) · Total coliform health-based began Nov 1992 Resolved

Max contaminant level (MCL) · Total coliform health-based began Sep 1992 Resolved

Recent enforcement actions

State action · SOX Jul 2017
State action · SIA Apr 2017
State action · SOX Aug 2015
State action · SIA Mar 2015
State action · SOX Sep 2011
State action · SOX Mar 2011
State action · SFL Feb 2011
State action · SIA Feb 2011

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

3 stations · latest May 2023

4.54 · max 6.86 mg/l as N · 6

Arsenic

3 stations · latest May 2023

2.3 · max 2.7 ug/l · 3

Fluoride

3 stations · latest May 2023

0.12 · max 0.12 mg/l · 3

Lead

3 stations · latest May 2023

0.07 · max 0.137 ug/l · 3

Uranium

3 stations · latest May 2023

4.07 · max 4.64 ug/l · 3

Copper

2 stations · latest Feb 2021

2.02 · max 3.4 ug/l · 2

Manganese

1 station · latest May 2023

1.21 · max 1.21 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 CA1010007 — 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.