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Tap water quality report

PFAS in GU

Of the 4 water suppliers tested for PFAS in GU, 1 detected PFOA or PFOS (25%).

25%
of suppliers detected PFOA or PFOS
4
suppliers tested
GU rankings Lead in GU PFAS in GU

What is PFAS?

PFAS — “forever chemicals” — are synthetic compounds that accumulate in the body and are linked to cancer, liver damage and immune effects. In 2024 the EPA set enforceable limits of 4 parts per trillion each for PFOA and PFOS. These are the only nationwide PFAS measurements, from the EPA’s UCMR-5 program.

Water suppliers

PFAS value per supplier, 2023–2025. EPA limit — 4 ppt (0.004 µg/L) for PFOA and PFOS, set in 2024. Suppliers that detected PFOA or PFOS are highlighted and listed first. “Not detected” means the contaminant was measured but not found.
SupplierCityPopulationPFAS (ug/L)
Gwa Northern Water System Adacao 139,207 0.1350 µg/L
Gwa Central Water System Adelup 21,398 Not detected
Andersen Air Force Base Water System Apo Ap 7,700 Not detected
Gwa Southern Water System Talofofo 5,801 Not detected