CLEARLAKE OAKS COUNTY WATER DISTRICT

CLEARLAKE OAK, CA · ~2,359 people served

Check your exact address → CLEARLAKE OAK overview

100

Excellent

PurityRadar safety score

PWSID

CA1710001

State

California

City

CLEARLAKE OAK

Population served

2,359

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

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Feb 2024. Official EPA record →

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2023 Resolved

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2021 Resolved

Monitoring & reporting · Lead & Copper Rule began Oct 2019 Resolved

Monitoring & reporting · Nitrate began Jan 2019 Resolved

Monitoring & reporting · EPA contaminant 0200 began Oct 2017 Resolved

Treatment technique · EPA contaminant 0200 health-based began Jul 2006 Resolved

Monitoring & reporting · Lead & Copper Rule began Jun 2006 Resolved

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2005 Resolved

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

Recent enforcement actions

State action · SOX Feb 2024
State action · SFL Mar 2023
State action · SOX Dec 2021
State action · SFL Sep 2021
State action · SFL May 2020
State action · SOX May 2020
State action · SFL Feb 2020
State action · SIA Jan 2020

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

Manganese

1 station · latest Apr 2023

3.97 · max 3.97 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 CA1710001 — 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.