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PUBLIC WATER SYSTEM REPORT

Is GWA NORTHERN WATER SYSTEM Water Safe to Drink in 2026?

Guam · PWSID GU0000006 · Ground water

Population served
139,207
Cities served
ADACAO, ADELUP, AGANA HEIGHTS, ANIGUA, ASAN, DEDEDO, PIGO, TALOFOFO, TAMUNING, TUMON
State / jurisdiction
Guam (GU)
PWSID
GU0000006
F
TAP WATER GRADE
High Risk
Model score 27/88 from violations, PFAS profile, and monitoring signals — not a laboratory test of your faucet.
30 violation record(s) in the latest EPA SDWA quarterly snapshotPFAS above EPA MCL (UCMR5 regulated compounds)
CONTAMINANTS — EPA UCMR5 MONITORING
Compound
Level (ppt)
EPA limit
Health guideline
Status
6:2 FTS
148.2
Within / n/a
Unregulated (monitored)
PFOSregulated
135.0
4 ppt
Exceeds
Above health advisory
PFHxSregulated
80.0
10 ppt
Exceeds
Above health advisory
PFPeA
47.5
Within / n/a
Unregulated (monitored)
PFHxA
37.1
Within / n/a
Unregulated (monitored)
PFBS
34.9
Within / n/a
Unregulated (monitored)
PFHpA
18.5
Within / n/a
Unregulated (monitored)
PFOAregulated
18.3
4 ppt
Exceeds
Above health advisory
PFBA
18.1
Within / n/a
Unregulated (monitored)
PFPeS
9.9
Within / n/a
Unregulated (monitored)
8:2 FTS
7.5
Within / n/a
Unregulated (monitored)

Source: EPA UCMR5 · ppt = parts per trillion · MCL = enforceable limit for regulated PFAS

Official Consumer Confidence Report (CCR)

The official 2026 CCR for GWA NORTHERN WATER SYSTEM has not yet been published on WaterCheckup.

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Residents: Your public water system is required by EPA to publish an annual CCR by July 1st each year. Contact GWA NORTHERN WATER SYSTEMdirectly to request a copy, or check the EPA's national CCR portal at cfpub.epa.gov/ccr.

VIOLATIONS HISTORY (FEDERAL SNAPSHOT)

EPA’s national SDWA quarterly files associate 30 violation-related records with this system in the same reporting quarter as the public water system snapshot used on WaterCheckup. This is not a complete historical docket — see ECHO and SDWIS for full compliance context.

Get alerts if this system's EPA data changes:
WHAT TO DO ABOUT IT

Based on GWA NORTHERN WATER SYSTEM's monitoring and violation profile, here are vetted filtration options — same picks framework as our city reports.

Clean water splash — certified water filter recommendations

Certified Filter Recommendations

Matched to what's actually in your water

TOP PICKS FOR GWA NORTHERN WATER SYSTEM
EPA violations / contaminants in monitoring data
#1
Waterdrop G3P600 RO
EDITORS PICK
Waterdrop  ·  ~$439
Tankless 600 GPD, removes 99%+ PFAS & lead, 10-stage filtration. Smart faucet TDS display.
WHY THIS FOR GWA NORTHERN WATER SYSTEM · Chosen for GWA NORTHERN WATER SYSTEM because PFAS was detected at 148.2 ppt in UCMR5 — above the 4 ppt limit for some regulated compounds — and this system shows 30 violation record(s) in the latest federal snapshot. RO removes 99%+ of PFAS at the tap.
#2
Aquasana SmartFlow RO
MOST CERTIFIED
Aquasana  ·  ~$449
WQA Gold Seal + NSF 42/53/58/401. Most certifications of any under-sink RO. Removes 90+ contaminants.
#3
AquaTru Under-Sink RO
EASIEST FILTER CHANGE
AquaTru  ·  ~$375
NSF 42/53/58 certified. Quick-change filters, no tools. Compact tankless design, 4-stage filtration.
Not sure which filter is right for you? Take the 3-question quiz →
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