Environmental Rules in Maui County, HI (2026)
4 rules for unincorporated Maui County, Hawaii.
Verified from official government sources
Stormwater Management
Maui County prohibits any illicit discharge into its storm-drainage system under Chapter 14.80 through 14.82 of the County Code, enacted by Ordinance No. 5749 in 2024. The Department of Public Works, through its director, administers and enforces the rule against dumping, spills, and non-stormwater flows that could pollute streams, gulches, and the ocean, while carving out routine flows like irrigation runoff, pool draining, and firefighting water.
Maui County Stormwater Discharge Ban
Some RestrictionsMaui County Code §§ 14.81.010, 14.82.010
A.No person may cause or allow others to cause an illicit discharge into the storm-drainage system or any drainageway within the County. The commencement, conduct, or continuance of any illicit discharge to the storm-drainage system is prohibited except as allowed by appendix K of title 11, chapter 55, Hawaiʻi Administrative Rules, as amended, if they do not cause or contribute to any violation...
Erosion Control
Maui County Code Chapter 20.08 requires a grading permit before any grading or stockpiling and a separate grubbing permit before clearing vegetation, with a stricter 50-cubic-yard/2-foot trigger inside special management areas, to control construction erosion and sediment.
Maui County Grading and Erosion Control Permit
Some RestrictionsMaui County Code § 20.08.040
A.No person shall commence or perform any grading or stockpiling without a grading permit; andB.No person shall commence or perform any grubbing without a grubbing permit, except where grubbing concerns land for which a grading permit has been issued.C.No person shall commence or perform any cut or fill activity on land located within any special management areas, as defined by chapter 205A. Ha...
Flood Zones
Maui County requires a special flood hazard area development permit from the Department of Public Works before any construction, fill, grading or other development begins in a mapped special flood hazard area, flood-related erosion hazard area or mudslide area on Maui, Molokai or Lanai.
Maui County Flood Hazard Area Permit
Some RestrictionsMaui County Code § 16.29.050(A)
A.Special flood hazard area development permit. A special flood hazard area development permit must be obtained from the director before construction of any development begins within any special flood hazard area, flood-related erosion hazard area, or mudslide area.
Flood Elevation Requirements
New construction and substantially improved buildings in Maui County's mapped flood zones must have the lowest floor, including any basement, built at least one foot above the base flood elevation, with the finished elevation certified on FEMA's form and filed with the director.
Maui County Base Flood Elevation Rule
Some RestrictionsMaui County Code § 16.29.060(A)(3)(a)
3.Elevation and floodproofing.a.New construction and substantial improvements, except those in zone AO, must have the lowest floor, including basement, elevated to at least one foot above the base flood elevation. On completion of the structure, the elevation of the lowest floor, including basement, must be certified by an engineer or surveyor. FEMA's "elevation certificate" form, as amended, m...
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