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Water system · PWSID GU0000001

GWA SOUTHERN WATER SYSTEM

MANGILAO, GU · ~5,801 people served

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

PWSID

GU0000001

State

Guam

City

MANGILAO

Population served

5,801

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

2

Violations on record

0

Unaddressed

2

Health-based

16

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jun 2018. Official EPA record →

Max contaminant level (MCL) · Lead & Copper Rule health-based began Jan 2018 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jan 2012 Resolved

Recent enforcement actions

  • State action · SOX Jun 2018
  • State action · SIE Feb 2018
  • State action · SIA Feb 2018
  • State action · SFH Feb 2018
  • EPA/federal action · EOX Nov 2014
  • State action · SIA Feb 2014
  • State action · SIE Feb 2014
  • State action · SIA Sep 1985

This profile is built from EPA public records for system GU0000001 — 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.