Haw. Rev. Stat. § 342H-36: Recycling for agricultural purposes; encouraged.

The director shall encourage the recycling of solid wastes, including animal wastes and selected non-hazardous industrial wastes, and the composting of animal manures and by-products for agricultural and horticultural purposes. The use of treated sludge effluent for fertilizer and other agricultural purposes shall also be encouraged. Composting of agricultural secondary organic resources under approved methods shall also be encouraged.