Maui County, HI Landscaping Rules: Rainwater Harvesting (2026)

Maui County's water code treats private rainwater catchment as a self-service alternative to the public water system rather than a permitted or subsidized program. 04's requirements, meaning a household running one does not have to follow the department's standard water-service application, metering, and connection rules that apply to consumers on the public system. 080 adds a liability disclaimer specific to catchment systems: the County will not be responsible for monitoring the safety or quality of the water collected in a private water catchment system. 010(E) is the operative constraint on where a catchment system can be used.

Property owners relying on catchment water for drinking must arrange their own testing and treatment, typically coordinating with the State Department of Health rather than the County, because the ordinance places responsibility for water quality entirely on the owner rather than the department. The provision does not set tank size, setback, or overflow standards; those requirements, if any, sit in the building and plumbing code chapters rather than in title 14.