RANCHO NIPOMO WATER COMPANY

ARROYO GRANDE, CA · ~44 people served

Check your exact address → ARROYO GRANDE overview

100

Excellent

PurityRadar safety score

PWSID

CA4000771

State

California

City

ARROYO GRANDE

Population served

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 Aug 2007. Official EPA record →

Monitoring & reporting · Total coliform began Jul 2007 Resolved

Other · EPA contaminant 7000 began Jul 2005 Resolved

Monitoring & reporting · Total coliform began Jul 2005 Resolved

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

Recent enforcement actions

State action · SIE Aug 2007
EPA/federal action · EOX Sep 2005
State action · SOX Aug 2005
State action · SIE Aug 2005
State action · SOX Aug 2005
State action · SOX Sep 2003

This profile is built from EPA public records for system CA4000771 — 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.