Is there PFAS in Hnl-windward-pearl Harbor water?
Yes, at low levels. 1 PFAS was detected, all below EPA's 2024 limits.
Hnl-windward-pearl Harbor
Serves 631,389 people · 92 PFOA samples from 47 sampling points · May 2023 to Dec 2025
PFAS found, below EPA limits
PFOA Perfluorooctanoic acid
not detected
PFOS Perfluorooctanesulfonic acid
not detected
PFHxS Perfluorohexanesulfonic acid
1.5 ppt avg · max 3.0
Hazard index GenX, PFBS, PFNA, PFHxS combined
0.1 avg · max 0.3
Hnl-windward-pearl Harbor is a public water system drawing on groundwater, based in Honolulu, Hawaii, serving about 631,389 people, including Aiea, Hauula, Kaaawa, Kailua, Kaneohe, Laie. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 92 times across 47 sampling points between May 2023 and Dec 2025.
Every PFAS detected
Not detected: PFHxA, HFPO-DA, PFDA, PFOS, PFNA, PFHpA, PFBS, PFHpS, PFPeS, NFDHA, ADONA, PFMBA, PFBA, PFPeA, PFMPA, 8:2 FTS, 4:2 FTS, 6:2 FTS, NMeFOSAA, NEtFOSAA, PFTrDA, PFTA, PFEESA, 11Cl-PF3OUdS, 9Cl-PF3ONS, PFUnA, PFDoA, PFOA.
Lithium, tested in the same program: not detected.
What the EPA limits mean here
In April 2024 EPA set enforceable limits of 4 ppt for PFOA and PFOS, 10 ppt each for PFHxS, PFNA and GenX, and a hazard index of 1 for mixtures. Utilities were given until 2029 to comply. In May 2026 EPA proposed keeping only the PFOA and PFOS limits and moving that deadline to 2031. Until that proposal is final, the 2024 limits stand.
Compliance is judged on a running annual average at each entry point, so we show the average at this system's worst sampling point next to its single highest result. UCMR 5 results do not by themselves put a utility in or out of compliance.
What you can do at home
Levels here are under EPA's limits, so no treatment is required. If you want them lower anyway, a certified reverse osmosis system under the sink handles drinking water, and a whole-house carbon filter also takes out the chlorine or chloramine your utility adds.
Other systems in Hawaii
All 45 tested systems in Hawaii
ZIP codes served
96701 96717 96730 96734 96744 96762 96782 96795 96813 96814 96815 96816 96817 96818 96819 96821 96822 96825 96826
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Cite this page
Well & Tap. "PFAS in Hnl-windward-pearl Harbor water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID HI0000331. https://wellandtap.com/pfas/hawaii/hnl-windward-pearl-harbor/
About this data
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID HI0000331). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
