ROH §30-5.1
No Adding Substances to Public Water to Affect Your Body
Read the official text at honolulu.gov ↗This law bans anyone from putting anything into the public water supply to change how your body or mind works. It does not apply to federal water systems like military bases, and it does not ban chemicals used to make water safe to drink, like chlorine or lead-reducing treatments.
everyone
The ordinance, as written (Honolulu County) — Prohibition
A copy, taken August 22, 2026. The version published by Honolulu is the one that governs, and it may have changed since. Check it before relying on anything here.
No person shall add any product, substance, or chemical to the public water supply, except federally owned and operated water systems, such as military facilities, for the purpose of treating or affecting the physical or mental functions of the body of any person, rather than to make the water safe or potable. This prohibition shall not apply to water treatment chemicals used to make the water potable and safe to drink, such as chlorination and anticorrosion chemical to reduce lead.
Published by the City and County of Honolulu through American Legal Publishing.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.