SAN GABRIEL VALLEY WC - FONTANA

FONTANA, CA · ~237,700 people served

Check your exact address → FONTANA overview

100

Excellent

PurityRadar safety score

PWSID

CA3610041

State

California

City

FONTANA

Population served

237,700

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

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

2 stations · latest May 2022

4.68 · max 5 mg/l as N · 4

Arsenic

2 stations · latest May 2022

0.825 · max 0.84 ug/l · 2

Fluoride

2 stations · latest May 2022

0.145 · max 0.15 mg/l · 2

Uranium

2 stations · latest May 2022

2.26 · max 2.49 ug/l · 2

Copper

1 station · latest May 2022

1.2 · max 1.2 ug/l · 1

Lead

1 station · latest May 2022

0.065 · max 0.065 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 CA3610041 — 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.