ANDERSEN AIR FORCE BASE WATER SYSTEM

APO AP, GU · ~7,700 people served

Check your exact address → APO AP overview

100

Excellent

PurityRadar safety score

PWSID

GU0000009

State

Guam

City

APO AP

Population served

7,700

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 Nov 2024). Levels in parts per trillion (ppt).

PFHxS

Perfluorohexanesulfonic acid

3.2 ppt

limit 10 ppt

Below EPA limit

PFHxA

4.9 ppt

limit —

No federal limit

PFPeS

4.6 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jan 2014. Official EPA record →

Other · EPA contaminant 7000 began Oct 2013 Resolved

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

Monitoring & reporting · Total coliform began Jun 2013 Resolved

Recent enforcement actions

State action · SIE Jan 2014
State action · SIA Jan 2014
State action · SOX Nov 2013
State action · SOX Oct 2013
State action · SIE Jul 2013
State action · SIA Jul 2013
State action · SOX Jul 2013

This profile is built from EPA public records for system GU0000009 — 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.