ALAMEDA COUNTY WATER DISTRICT

FREMONT, CA · ~344,000 people served

Check your exact address → FREMONT overview

100

Excellent

PurityRadar safety score

PWSID

CA0110001

State

California

City

FREMONT

Population served

344,000

Primary source

Surface water

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 Jun 1997. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began Apr 1996 Resolved

Treatment technique · EPA contaminant 0200 health-based began Jun 1993 Resolved

Monitoring & reporting · Total coliform began Sep 1992 Resolved

Recent enforcement actions

State action · SOX Jun 1997
State action · SIE May 1997
State action · SOX May 1996
State action · SIA May 1996
State action · SFJ Aug 1993
State action · SOX Jun 1993
State action · SOX Oct 1992
State action · SIA Sep 1992

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

4 stations · latest Apr 2022

0.042 · max 0.483 mg/l as N · 18

Arsenic

1 station · latest Apr 2022

1.2 · max 1.2 ug/l · 1

Manganese

1 station · latest Apr 2022

195 · max 195 ug/l · 1

Uranium

1 station · latest Apr 2022

1.11 · max 1.11 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 CA0110001 — 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.