Is Asan, Guam tap water safe?
2 water systems report serving Asan. Your water depends on which one serves your address. Check your bill if unsure.
D
GWA Northern Water System
Serves 139,207 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOS, PFOA; Other PFAS above 2024 limits (rule proposed for repeal): PFHxS, Hazard Index; Lead 90th percentile below the action level (2025).
B
GWA Central Water System
Serves 8,828 people · Surface water · Full report →
1 health-based violation in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).