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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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.
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