HNL-WINDWARD-PEARL HARBOR

HONOLULU, HI · ~631,389 people served

Check your exact address → HONOLULU overview

100

Excellent

PurityRadar safety score

PWSID

HI0000331

State

Hawaii

City

HONOLULU

Population served

631,389

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

Latest detections from EPA’s UCMR5 monitoring (through Jun 2023). Levels in parts per trillion (ppt).

PFHxS

Perfluorohexanesulfonic acid

3 ppt

limit 10 ppt

Below EPA limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Max contaminant level (MCL) · Total coliform health-based began Oct 2013 Resolved

Monitoring & reporting · Barium began Jan 2008 Resolved

Monitoring & reporting · Beryllium began Jan 2008 Resolved

Monitoring & reporting · Chromium (total) began Jan 2008 Resolved

Monitoring & reporting · Selenium began Jan 2008 Resolved

Monitoring & reporting · EPA contaminant 1036 began Jan 2008 Resolved

Monitoring & reporting · Cadmium began Jan 2008 Resolved

Monitoring & reporting · EPA contaminant 1075 began Jan 2008 Resolved

Monitoring & reporting · EPA contaminant 1085 began Jan 2008 Resolved

Monitoring & reporting · Antimony began Jan 2008 Resolved

Monitoring & reporting · Fluoride began Jan 2008 Resolved

Monitoring & reporting · Arsenic began Jan 2008 Resolved

Recent enforcement actions

State action · SIF Dec 2024
State action · SOX Dec 2024
State action · SIA Dec 2024
State action · SOX Oct 2013
State action · SIF Oct 2013
State action · SIA Oct 2013
State action · SOX Jul 2013
State action · SIF Jul 2013

This profile is built from EPA public records for system HI0000331 — 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.