LAGUNA NEGRA MUTUAL WATER CO.

ARROYO GRANDE, CA · ~80 people served

Check your exact address → ARROYO GRANDE overview

100

Excellent

PurityRadar safety score

PWSID

CA4000705

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 Mar 2024. Official EPA record →

Monitoring & reporting · Nitrate began Jan 2023 Resolved

Monitoring & reporting · Lead & Copper Rule began Oct 2021 Resolved

Monitoring & reporting · Lead & Copper Rule began Oct 2017 Resolved

Monitoring & reporting · Nitrate began Jan 2017 Resolved

Monitoring & reporting · Total coliform began Jan 2006 Resolved

Monitoring & reporting · Total coliform began Oct 2005 Resolved

Monitoring & reporting · Total coliform began Jul 2005 Resolved

Recent enforcement actions

State action · SOX Mar 2024
State action · SFL Jan 2024
State action · SOX Sep 2022
State action · SFL Dec 2021
State action · SOX Oct 2019
State action · SOX Jan 2019
State action · SFL Nov 2018
State action · SFL Mar 2018

This profile is built from EPA public records for system CA4000705 — 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.