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Water system · PWSID GU0000003

GWA CENTRAL WATER SYSTEM

MANGILAO, GU · ~21,398 people served

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

PWSID

GU0000003

State

Guam

City

MANGILAO

Population served

21,398

Primary source

SWP

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

34

Violations on record

0

Unaddressed

15

Health-based

42

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Apr 2022. Official EPA record →

Max contaminant level (MCL) · Lead & Copper Rule health-based began Apr 2022 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2012 Resolved
Monitoring & reporting · EPA contaminant 1075 began Jan 2012 Resolved
Monitoring & reporting · Barium began Jan 2012 Resolved
Monitoring & reporting · Cadmium began Jan 2012 Resolved
Monitoring & reporting · Beryllium began Jan 2012 Resolved
Monitoring & reporting · Chromium (total) began Jan 2012 Resolved
Monitoring & reporting · EPA contaminant 1085 began Jan 2012 Resolved
Monitoring & reporting · Antimony began Jan 2012 Resolved
Monitoring & reporting · Cyanide began Jan 2012 Resolved
Monitoring & reporting · Selenium began Jan 2012 Resolved
Monitoring & reporting · Arsenic began Jan 2012 Resolved

Recent enforcement actions

  • State action · SFH Apr 2022
  • State action · SOX Apr 2022
  • State action · SIA Apr 2022
  • State action · SFJ Apr 2022
  • State action · SIE Apr 2022
  • EPA/federal action · EOX Nov 2014
  • EPA/federal action · EOX May 2014
  • State action · SIE Feb 2014

This profile is built from EPA public records for system GU0000003 — 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.