Hawaii: State guide

Hawaii’s Safe Drinking Water Branch has a dedicated Lead Service Line page, and major county utilities publish their own lead inventory information.

Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.

Official resources in Hawaii

State lead service line page with Hawaii DOH implementation materials, templates, and lead rule updates.

Official Oahu utility page with lead service line inventory information and links to address lookup and test results.

Official address lookup for the service line serving a home or business in the Honolulu Board of Water Supply system.

Official Big Island utility page explaining field inspections and service line inventory work under the Lead and Copper Rule Revisions.

Official Hawaii license and business lookup residents can use before hiring a plumber or contractor.

Hawaii DOH’s Lead Service Line page was last updated March 6, 2026.
Hawaii DOH says EPA issued the final Lead and Copper Rule Improvements on October 8, 2024.
Hawaii’s notification form says affected customers must be notified within 30 days of baseline inventory completion.
Hawaii’s notification form says annual notices must continue for lead, galvanized-requiring-replacement, or unknown service lines.
Honolulu BWS says its inventory covers the entire service line from water mains to homes and buildings.
Hawaii County DWS says staff and contractors inspect meter boxes and above-ground customer waterlines to document service line material.

Check the state DOH page first, then your island utility’s own lookup or lead-rule page for property-specific information.
If your utility identifies lead or unknown material, ask for the written notice and whether the utility will coordinate its side if you replace yours.
Use Hawaii DCCA’s license lookup before hiring a plumber or contractor for service line work.

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