CUCAMONGA VALLEY WATER DISTRICT

RANCHO CUCAMONGA, CA · ~211,069 people served

Check your exact address → RANCHO CUCAMONGA overview

100

Excellent

PurityRadar safety score

PWSID

CA3610018

State

California

City

RANCHO CUCAMONGA

Population served

211,069

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

1 station · latest Jul 2021

0.596 · max 0.596 mg/l as N · 2

Copper

1 station · latest Jul 2021

1.6 · max 1.6 ug/l · 1

Fluoride

1 station · latest Jul 2021

0.08 · max 0.08 mg/l · 1

Lead

1 station · latest Jul 2021

0.416 · max 0.416 ug/l · 1

Uranium

1 station · latest Jul 2021

2.83 · max 2.83 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 CA3610018 — 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.