Skip to main content
10,000+ reports checkedFind the right filter →
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 0/88 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)

Water operator? Publish your official 2027 CCR here — residents already find this page. Claim free →

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

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 utility 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.

TOP PICKS FOR GWA NORTHERN WATER SYSTEM
⚠ EPA violations / contaminants in monitoring data
#1
Waterdrop G3P800 RO
EDITORS PICK
Waterdrop  ·  ~$849
Tankless 800 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 →
See all utilities in Guam →
STAY INFORMED
Get water quality alerts for GWA NORTHERN WATER SYSTEM

We'll notify you when new PFAS data, EPA violations, or contamination alerts affect GWA NORTHERN WATER SYSTEM (PWS GU0000006). One email, no spam, unsubscribe any time.

Water operator for GWA NORTHERN WATER SYSTEM? Claim this listing →
Check your ZIP code

PWS-wide data may differ from the system serving your home. Enter your ZIP on the homepage for a tailored EPA report.

Fix My Water — Free →