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Tap water quality report

Andersen Air Force Base Water

EPA monitoring tested this supplier for 31 contaminants and detected 4. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

31
contaminants tested
4
detected
7,700
people served
4
health-based violations
GU rankingsLead in GUPFAS in GU
Water source
Ground water
Ownership
Federal government
Counties served
Guam

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

4
health-based violations
10
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2013-09-01 → 2013-09-30
MCL Health-based Archived 2011-10-01 → 2011-10-31
MCL Health-based Archived 2011-10-01 → 2011-10-31
MCL Health-based Archived 2011-10-01 → 2011-10-31
Other Monitoring Resolved 2013-10-01
Other Monitoring Resolved 2013-10-01
Other Monitoring Resolved 2013-10-01
MR Monitoring Resolved 2013-06-01 → 2013-06-30
MR Monitoring Resolved 2013-06-01 → 2013-06-30
MR Monitoring Resolved 2013-06-01 → 2013-06-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFHXS 0.0034 µg/L 2/8 2025
Pfhxa 0.0049 µg/L 1/8 2025
Pfpes 0.0046 µg/L 1/8 2025

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.00085 mg/L 5.7%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2025
27 contaminants tested, none detected
11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaHfpo-DaNetfosaaNfdhaNmefosaaPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPFOAPFOSPfpeaPftaPftrdaPfunaLithium

Utility contact

Contact
DUNKS, JOHN J.
Phone
671-366-4553

Frequently asked questions about Andersen Air Force Base Water

Is Andersen Air Force Base Water tap water safe to drink?

EPA monitoring detected 4 contaminants in Andersen Air Force Base Water's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Andersen Air Force Base Water's water?

EPA monitoring detected Lead, PFHXS, Pfhxa, Pfpes. The full list with the level and data source for each is above.

How many people does Andersen Air Force Base Water serve?

Andersen Air Force Base Water reports serving 7,700 people in GU, per its EPA record.

Has Andersen Air Force Base Water had any water quality violations?

The EPA has 10 violations on file for Andersen Air Force Base Water, of which 4 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.