Maui County, HI Environmental Rules: Erosion Control (2026)

040 sets the baseline: no person may commence grading or stockpiling without a grading permit, and no person may grub land without a grubbing permit unless a grading permit already covers it. 040C drops the threshold so any cut or fill exceeding fifty cubic yards or two feet in vertical height, including ordinary single-family construction, needs a grading permit. 031 exempts small jobs from the permit-application steps only, not from the chapter's minimum best-management-practice duties: excavation or fill under 100 cubic yards and 4 feet in height that does not change drainage, grubbing under one acre that does not change drainage, and utility trenching under 2 feet deep and 50 cubic yards.

035 obligates every grading, grubbing and stockpiling job, permitted or excluded, to control erosion and sediment through drainage handling, dust control, vegetation retention, erosion and sediment control measures such as silt fences and sediment basins, and stabilization of any disturbed area left idle 21 days or more within 14 days of the last disturbance. 060 requires an engineer-prepared erosion control plan and drainage report once graded area exceeds one acre or a cut or fill exceeds 15 feet, plus an engineer's soils report for deeper cuts or fills in wetlands or plastic clay, and an engineering slope hazard report for grading on slopes steeper than 35 percent above developed areas. 110, subject to a director-granted extension for hardship.