Home/ Directory/ CA/ CITY OF MERCED

Water system · PWSID CA2410009

CITY OF MERCED

MERCED, CA · ~93,692 people served

Check your exact address → MERCED overview
35
Action needed
PurityRadar safety score

PWSID

CA2410009

State

California

City

MERCED

Population served

93,692

Primary source

Groundwater

Score history

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

Jun 18, 2026 · score 100 Jun 18, 2026 · score 35

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

PFOS

Perfluorooctanesulfonic acid

6.5 ppt

limit 4 ppt

Above EPA limit · 1.6×

PFHxS

Perfluorohexanesulfonic acid

12 ppt

limit 10 ppt

Above EPA limit · 1.2×

PFOA

Perfluorooctanoic acid

4.5 ppt

limit 4 ppt

Above EPA limit · 1.1×

PFHxA

3.4 ppt

limit —

No federal limit

Violations & enforcement

2

Violations on record

0

Unaddressed

2

Health-based

11

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jan 2009. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began May 2001 Resolved
Max contaminant level (MCL) · Total coliform health-based began Apr 1994 Resolved

Recent enforcement actions

  • State action · SOX Jan 2009
  • State action · SIA Jan 2009
  • State action · SOX Jun 2001
  • State action · SFL Jun 2001
  • EPA/federal action · EOX Mar 2000
  • State action · SOX May 1994
  • State action · SFJ May 1994
  • State action · SOX May 1994

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

1 station · latest Apr 2021

2.63 · max 2.63 mg/l as N · 2

Arsenic

1 station · latest Apr 2021

2.1 · max 2.1 ug/l · 1

Atrazine

1 station · latest Apr 2021

0.007 · max 0.007 ug/l · 1

Copper

1 station · latest Apr 2021

1.4 · max 1.4 ug/l · 1

Fluoride

1 station · latest Apr 2021

0.13 · max 0.13 mg/l · 1

Lead

1 station · latest Apr 2021

0.373 · max 0.373 ug/l · 1

Uranium

1 station · latest Apr 2021

3.8 · max 3.8 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 CA2410009 — 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.