HILLTOP WATER OWNERS ASSOCIATION

Lummi Island, WA · ~137 people served

Check your exact address → Lummi Island overview

100

Excellent

PurityRadar safety score

PWSID

WA5333364

State

Washington

City

Lummi Island

Population served

137

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 2020. Official EPA record →

Monitoring · Lead & Copper Rule began Jul 2020 Resolved

Monitoring · Lead & Copper Rule began Jun 2020 Resolved

Max contaminant level (MCL) · Arsenic health-based began Jan 2010 Resolved

Monitoring & reporting · Nitrate began Jan 2009 Resolved

Monitoring & reporting · Arsenic began Apr 2007 Resolved

Monitoring & reporting · Arsenic began Jan 2007 Resolved

Monitoring & reporting · Arsenic began Oct 2006 Resolved

Monitoring & reporting · Arsenic began Jul 2006 Resolved

Recent enforcement actions

State action · SOX Aug 2020
State action · SOX Feb 2013
State action · SOX May 2010
State action · SOX Mar 2010
State action · SOX Sep 2007
State action · SOX Sep 2007
State action · SOX Sep 2007
State action · SOX Sep 2007

This profile is built from EPA public records for system WA5333364 — 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.