UPPER LAKE COUNTY WATER DISTRICT

UPPER LAKE, CA · ~989 people served

Check your exact address → UPPER LAKE overview

100

Excellent

PurityRadar safety score

PWSID

CA1710009

State

California

City

UPPER LAKE

Population served

989

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 May 2020. Official EPA record →

Monitoring & reporting · Nitrate began Jan 2019 Resolved

Monitoring & reporting · Lead & Copper Rule began Jul 2008 Resolved

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

Recent enforcement actions

State action · SFL May 2020
State action · SOX May 2020
State action · SOX Jul 2016
State action · SFL Jul 2009
EPA/federal action · EOX Dec 2003

This profile is built from EPA public records for system CA1710009 — 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.