Hawaii Revised Statutes Division 1. Government § 342F-30.8

(a) In any urban land use district, as designated pursuant to section 205-2, it shall be unlawful for any person to operate a leaf blower or weed whacker within a residential zone or within one hundred feet of a residential zone in the State, except between the hours of 8:00 a.m. and 7:00 p.m. on any day except Sunday or a state or federal holiday, and between the hours of 9:00 a.m. and 7:00 p.m. on Sunday or any state or federal holiday; provided that government entities, and agents acting on behalf of government entities, may use weed whackers during the prohibited hours in the case of an emergency as defined in section 127A-2.

(b) Violators shall be fined $50 for the first violation, $100 for the second violation, $200 for the third violation, and $500 for each subsequent violation.

(c) Government entities, and agents acting on behalf of government entities, shall not be subject to this section as it applies to leaf blowers.

(d) Any county may adopt a rule or ordinance that places stricter limitations on the use of leaf blowers or weed whackers than are in this section. In case of a conflict between the requirements or limitations of this section and any county rule or ordinance regarding the use of leaf blowers or weed whackers, the more restrictive requirements shall apply.

(e) For the purposes of this section:

“Leaf blower” means any machine used to blow leaves, dirt, or other debris off sidewalks, driveways, lawns, and other surfaces.

“State holiday” means any day established as a state holiday in section 8-1.

“Weed whacker” means a gasoline or electric powered yard tool that uses either a flexible monofilament line (also known as a string or line trimmer) or revolving metal cutting blade intended to cut or trim grass and other vegetation.