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Water system · PWSID CA3910017

SAN JOAQUIN COUNTY-MOKELUMNE ACRES

STOCKTON, CA · ~3,802 people served

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

PWSID

CA3910017

State

California

City

STOCKTON

Population served

3,802

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

PFOS

Perfluorooctanesulfonic acid

14 ppt

limit 4 ppt

Above EPA limit · 3.4×

PFOA

Perfluorooctanoic acid

7.9 ppt

limit 4 ppt

Above EPA limit · 2.0×

PFHxS

Perfluorohexanesulfonic acid

4.3 ppt

limit 10 ppt

Below EPA limit

PFBS

7.5 ppt

limit —

No federal limit

PFHxA

3.4 ppt

limit —

No federal limit

PFPeA

3.3 ppt

limit —

No federal limit

Violations & enforcement

No violations are on record for this system in EPA’s SDWIS/ECHO data.

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 Mar 2020

4.59 · max 4.59 mg/l as N · 2

Arsenic

1 station · latest Mar 2020

16.5 · max 16.5 ug/l · 1

Atrazine

1 station · latest Mar 2020

0.014 · max 0.014 ug/l · 1

Copper

1 station · latest Mar 2020

2 · max 2 ug/l · 1

Fluoride

1 station · latest Mar 2020

0.09 · max 0.09 mg/l · 1

Lead

1 station · latest Mar 2020

1.52 · max 1.52 ug/l · 1

Manganese

1 station · latest Mar 2020

2.42 · max 2.42 ug/l · 1

Uranium

1 station · latest Mar 2020

10.7 · max 10.7 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 CA3910017 — 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.