Haw. Rev. Stat. § 342D-73
An individual wastewater system may serve up to five bedrooms, regardless of the number of:
(2) Accessory units as defined by the counties,
whether the dwellings, dwelling units, or accessory units are attached or detached; provided that this section shall not apply to any new requests to connect additional dwelling units to an existing cesspool.
[L 2025, c 224, §2]