Haw. Rev. Stat. § 46-12: Cleaning shores and beaches of seaweed, limu, and debris.

The various counties shall be responsible for removing and clearing all seaweed, limu, and debris which are likely to create an unsanitary condition or to otherwise become a public nuisance from the shores and beaches situated within the respective counties; provided that to the extent any of the foregoing work is a private responsibility, the responsibility may be enforced by the county in lieu of the work being done at public expense.