Water Quality Report · Updated May 12, 2026
GWA NORTHERN WATER SYSTEM
GWA NORTHERN WATER SYSTEM delivers tap water graded A (98/100) by TapWaterSafety.org. The utility serves approximately 139,207 residents in TALOFOFO, GU using groundwater. For questions, the utility can be reached at 671-300-6845.
Is TALOFOFO tap water safe to drink?
GWA NORTHERN WATER SYSTEM delivers tap water that earns a grade of A (98/100) from TapWaterSafety.org — an excellent rating reflecting minimal contamination and full compliance with health guidelines.
The utility serves 139,207 residents in TALOFOFO and 9 other communities, drawing from groundwater.
Detected contaminants are below EWG's health-based guidelines. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for TALOFOFO residents
Contact GWA NORTHERN WATER SYSTEM
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for TALOFOFO
Filters matched to the specific contaminants in this water supply.
Quality carbon block filter (NSF/ANSI 42 + 53)
$80-$240A general-purpose carbon block filter handles most baseline water quality concerns.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 98/100 breaks down across five weighted components. Read the full methodology →
GWA NORTHERN WATER SYSTEM service area
This water system serves 10 communities in Guam County, GU. Click any city for its dedicated tap water quality page.
Find the right filter for TALOFOFO water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.