Haw. Rev. Stat. § 174C-63: Appurtenant rights.

Appurtenant rights are preserved. Nothing in this part shall be construed to deny the exercise of an appurtenant right, including access by the holder thereof to conduct activities necessary to assure the use, delivery, and quality of water including temperature and turbidity, that shall not be unreasonably withheld. A permit for water use based on an existing appurtenant right shall be issued upon application. The permit shall be subject to sections 174C-26 and 174C-27 and 174C-58 to 174C-62.