ROH Sec. 18A-1.6 requires approved erosion and sediment control plans for any building, grading, stockpiling, or trenching permit across Honolulu County, protecting Oahu's streams, reefs, and nearshore waters from construction runoff.
Chapter 18A of the Revised Ordinances consolidates Oahu's grading, soil erosion, and sediment control rules. Under Sec. 18A-1.6, any land-disturbing activity that requires a building permit, grading permit, stockpiling permit, or trenching permit must submit and obtain approval for an erosion and sediment control plan before work begins. Standards include perimeter silt fencing, inlet protection, stabilized construction entrances, and phased disturbance. DPP reviews plans and inspects sites; the rules apply island-wide, including steep upland terrain in Manoa Valley and coastal parcels in Haleiwa.
Starting work without an approved plan, or failing to maintain controls, can trigger stop-work orders, civil fines up to $1,000 per day, and requirements to restore disturbed areas under Chapter 18A enforcement.
Honolulu County, HI
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Honolulu County, HI
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Honolulu County, HI
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Honolulu County, HI
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Honolulu County, HI
Honolulu County requires building permits for most fences and walls under ROH 18-3.1, though retaining or riprap walls not exceeding 30 inches in height are ...
Honolulu County, HI
Honolulu's Land Use Ordinance Section 21-4.60 limits fence, wall, and hedge heights across zoning districts and imposes additional setback or landscape scree...
See how Honolulu County's erosion control rules stack up against other locations.
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