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Water system · PWSID CA2100579

NICASIO VALLEY RANCH MUTUAL

NICASIO, CA · ~36 people served

Check your exact address → NICASIO overview
100
Excellent
PurityRadar safety score

PWSID

CA2100579

State

California

City

NICASIO

Population served

36

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

15

Violations on record

0

Unaddressed

11

Health-based

16

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2023. Official EPA record →

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2021 Resolved
Monitoring & reporting · Arsenic began Jul 2020 Resolved
Monitoring & reporting · Arsenic began May 2020 Resolved
Other began Oct 2019 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2019 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2019 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2018 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2018 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2017 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2015 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2015 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2015 Resolved

Recent enforcement actions

  • State action · SOX Aug 2023
  • State action · SFL Feb 2022
  • State action · SOX Aug 2021
  • State action · SFL Dec 2020
  • State action · SFL Nov 2020
  • State action · SFL Oct 2020
  • State action · SOX Oct 2020
  • State action · SOX Jun 2020

This profile is built from EPA public records for system CA2100579 — 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.