Is Honolulu Tap Water Safe? What Honolulu Board of Water Supply (Windward-Pearl Harbor system)’s EPA Records Show
Honolulu Board of Water Supply (Windward-Pearl Harbor system), which serves about 631,389 people in Honolulu, Windward Oahu, and the Pearl Harbor grid, reported PFAS detections in the EPA’s UCMR5 monitoring (2023-2025), all below the current EPA limits. Occurrence data, not a compliance finding. Its most recent EPA-record lead 90th-percentile was non-detect (below the reporting limit) — under the current 15 ppb action level. The system has 3 health-based violations on its federal SDWA record.
See the full interactive report for this system — every PFAS analyte, lead and copper rounds, violations, and the filter that handles what was found: open the Honolulu report → Or check YOUR exact ZIP: check your water by ZIP →
Common questions about Honolulu water
Is Honolulu's tap water safe to drink?
Nothing in these records is above a current EPA limit, but there is something worth watching — a detection below the limit, an older exceedance, or a violation on record. See the card above. These are system-level records for public water systems, not a reading of any individual home’s tap, and they do not cover private wells. Confirm your own utility’s current Consumer Confidence Report, and test your tap if you’re unsure.
Does Honolulu have PFAS in its drinking water?
Honolulu Board of Water Supply (Windward-Pearl Harbor system) reported PFAS detections below current EPA limits in UCMR5 monitoring.
Who supplies Honolulu's drinking water?
Honolulu Board of Water Supply (Windward-Pearl Harbor system) (PWSID HI0000331) serves about 631,389 people in Honolulu, Windward Oahu, and the Pearl Harbor grid, per EPA SDWIS records. A metro area is usually served by more than one water system — this page covers the area’s largest. Suburbs and neighboring towns often have their own systems with their own results; check your exact ZIP for yours.
How do I check my exact address?
Water systems report by system, not by address. Enter your ZIP on the water checker to see the system(s) serving it and what each reported.
Statewide, 0.0% of Hawaii’s UCMR5-tested systems reported PFOA or PFOS over the EPA limit — see the Hawaii water page.
See the 100 largest US water systems, water quality by state, and the national PFAS data study.
Sources: EPA UCMR5 occurrence data, Feb 2026 release (~95% complete; final reporting 2026) (2026-06); lead/copper + violations: EPA SDWIS via ECHO; population served: EPA SDWIS via ECHO (system-reported population served). PWSID HI0000331. Public-domain federal/state records; assembly by WaterByTheBook. Built 2026-07-25. Plain-markdown mirror: https://waterbythebook.com/md/honolulu.md