TapGraded

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.

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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.

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