MONO VISTA RANCH MHP

RANCHO CUCAMONGA, CA · ~105 people served

Check your exact address → RANCHO CUCAMONGA overview

100

Excellent

PurityRadar safety score

PWSID

CA5500124

State

California

City

RANCHO CUCAMONGA

Population served

105

Primary source

Groundwater

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 Mar 2025. Official EPA record →

Monitoring · Lead & Copper Rule began Apr 2024 Resolved

Monitoring & reporting · Nitrate began Jan 2024 Resolved

Monitoring & reporting · Nitrate began Jan 2001 Resolved

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

Recent enforcement actions

State action · SOX Mar 2025
State action · SFL Feb 2025
State action · SOX Jul 2024
State action · SFL Jun 2024
State action · SFL Oct 2023
EPA/federal action · EOX Dec 2003
State action · SIA Feb 2002
State action · SOX Feb 2002

This profile is built from EPA public records for system CA5500124 — 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.