Act 209, on 07/08/2026 (Gov. Msg. No. 1311).
Summary
The bill mandates that every county in Hawaii must allow homeowners and other property owners to install rainwater collection systems for drinking and other uses, even if the property is already connected to a public water supply. Counties may still require owners to register the system, have it inspected, or give notice, but they cannot unreasonably block its use. The measure aims to ease water‑infrastructure constraints and support new housing development.
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