CITY OF MODESTO - SOUTH TURLOCK

MODESTO, CA · ~1,099 people served

Check your exact address → MODESTO overview

100

Excellent

PurityRadar safety score

PWSID

CA5010023

State

California

City

MODESTO

Population served

1,099

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

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2003. Official EPA record →

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

Recent enforcement actions

EPA/federal action · EOX Dec 2003

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

5.33 · max 5.33 mg/l as N · 2

Arsenic

1 station · latest Apr 2021

4.7 · max 4.7 ug/l · 1

Atrazine

1 station · latest Apr 2021

0.004 · max 0.004 ug/l · 1

Copper

1 station · latest Apr 2021

5.6 · max 5.6 ug/l · 1

Fluoride

1 station · latest Apr 2021

0.11 · max 0.11 mg/l · 1

Lead

1 station · latest Apr 2021

0.053 · max 0.053 ug/l · 1

Uranium

1 station · latest Apr 2021

16.7 · max 16.7 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 CA5010023 — 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.