Haw. Rev. Stat. § 46-20

Effective July 1, 1987, counties may implement programs for the regulation of sewerage and wastewater treatment systems in their respective county jurisdictions; except that a county program shall be implemented by that county immediately upon receipt of state funds pursuant to section 27-21.6(5). Each county is authorized to adopt ordinances and rules on the design, construction, and operation of sewerage and treatment systems and shall submit to the director of health, for approval, a full and complete description of the program it proposes to establish and administer under county laws.