Is GWA NORTHERN WATER SYSTEM water safe to drink?

GWA NORTHERN WATER SYSTEM has had multiple health-based violations in recent years (grade C). Review the specific violations below and consider filtering your drinking water.

What violations has GWA NORTHERN WATER SYSTEM had?

GWA NORTHERN WATER SYSTEM has 0 total violations on record, but none are currently active health-based violations.

Does GWA NORTHERN WATER SYSTEM water have lead?

Lead in drinking water typically comes from household plumbing, not from GWA NORTHERN WATER SYSTEM's treatment plant. See the Lead & Copper section on this page for the most recent 90th-percentile lead test results. If your home was built before 1986, consider running cold water for 30 seconds before drinking and using an NSF/ANSI 53-certified filter.

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Safety Grade

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Violation History

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Recommendations

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About this data: ClearWater uses the EPA's Safe Drinking Water Information System (SDWIS). Data is for public water systems only; private wells are not included. Legal limits (MCLs) are minimum standards; some contaminants may still pose health risks below legal thresholds.

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GWA NORTHERN WATER SYSTEM

MANGILAO, GU · 139,207 people served · Groundwater

Data last updated: 2026-04-29

C Some concern: multiple health-based issues found

How is this graded?

0 total violations on record. No currently active health-based violations.

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PFAS / Forever Chemicals

EPA UCMR5 monitoring data (2023–2025). 11 PFAS compounds detected.

⚠ 3 PFAS compounds exceeded EPA limits - PFOS, PFHxS, PFOA

Compound	Detected	EPA MCL	Status
6:2 FTS	0.1482 µg/L	-	No federal MCL
PFOS	0.135 µg/L	0.004 µg/L	OVER LIMIT
PFHxS	0.08 µg/L	0.01 µg/L	OVER LIMIT
PFPeA	0.0475 µg/L	-	No federal MCL
PFHxA	0.0371 µg/L	-	No federal MCL
PFBS	0.0349 µg/L	-	No federal MCL
PFHpA	0.0185 µg/L	-	No federal MCL
PFOA	0.0183 µg/L	0.004 µg/L	OVER LIMIT
PFBA	0.0181 µg/L	-	No federal MCL
PFPeS	0.0099 µg/L	-	No federal MCL
8:2 FTS	0.0075 µg/L	-	No federal MCL

Source: EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR5). MCLs finalized April 2024. Values shown are the maximum detected concentration across all sampling events.

Lead & Copper

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What's in yourtap water?