Haw. Rev. Stat. § 174C-13

The commission shall adopt, pursuant to chapter 91, procedural rules for the processing of citizen complaints including the right of appeal to the commission. If any person files a complaint with the commission that any other person is wasting or polluting water or is making a diversion, withdrawal, impoundment, consumptive use of waters or any other activity occurring within or outside of a water management area, not expressly exempted under this code, without a permit where one is required, the commission shall cause an investigation to be made, take appropriate action, and notify the complainant thereof.