Honolulu, HI water quality

Honolulu, HI is served by 19 public water systems, serving 969,030 people combined. Across those systems, we count 0 health-based violations in the last 5 years. The worst Tap Grade among them is A.

Water systems serving Honolulu

HNL-WINDWARD-PEARL HARBOR

HONOLULU, HI · 631,389 served

WAIPAHU-EWA-WAIANAE

HONOLULU, HI · 217,479 served

MILILANI

HONOLULU, HI · 50,573 served

WAHIAWA

HONOLULU, HI · 23,348 served

WAIPIO HEIGHTS

HONOLULU, HI · 11,516 served

WAIALUA-HALEIWA

HONOLULU, HI · 9,996 served

WAIALEE-SUNSET BEACH

HONOLULU, HI · 4,916 served

PUNAHOU SCHOOL

HONOLULU, HI · 4,000 served

KAMEHAMEHA SCHOOLS

HONOLULU, HI · 4,000 served

THE QUEEN'S MEDICAL CENTER

HONOLULU, HI · 3,440 served

SHERATON HOTELS

HONOLULU, HI · 2,830 served

KAHUKU

HONOLULU, HI · 2,730 served

DILLINGHAM AIRFIELD

HONOLULU, HI · 1,800 served

WAIMANO RIDGE

HONOLULU, HI · 545 served

WAIAHOLE

HONOLULU, HI · 300 served

PALEHUA SOLAR OBSERVATORY

HONOLULU, HI · 50 served

WOODLANDS AT NUUANU

HONOLULU, HI · 48 served

ST STEPHEN'S DIOCESAN CTR

HONOLULU, HI · 45 served

POAMOHO

HONOLULU, HI · 25 served

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Frequently asked questions

Is Honolulu, HI tap water safe to drink?

19 public water systems serve Honolulu, HI, with 0 health-based violations in the last 5 years across them. The worst Tap Grade among them is A. A Tap Grade summarizes public EPA compliance records; it is not a determination that water is safe or unsafe to drink.

Does Honolulu's water have lead in it?

The most recent 90th-percentile lead sample is 0 ppb, versus the EPA action level of 15 ppb.

Has PFAS been detected in Honolulu's water?

Yes — at least one water system serving Honolulu has detected PFAS under UCMR5.

Source: EPA SDWIS/ECHO · Data as of 2026Q2

TapGraded presents public EPA data for information only — it is not health advice and not a determination that any water is safe or unsafe to drink. For health concerns, contact your water utility or local health department.