Erosion Control: Honolulu vs Mililani Mauka
How do erosion control rules compare between Honolulu, HI and Mililani Mauka, HI?
Honolulu has fewer restrictions than Mililani Mauka.
Honolulu, HI
Honolulu County
The Honolulu Grading Ordinance (ROH chapter 14 article 13) requires permits and erosion controls for cuts, fills, and stockpiles, especially on Oahu's steep upland and coastal slopes.
View full Honolulu rules →Mililani Mauka, HI
Honolulu County
ROH Sec. 18A-1.6 requires approved erosion and sediment control plans for Mililani Mauka land-disturbing activities that need building, grading, stockpiling, or trenching permits.
View full Mililani Mauka rules →Key Facts Comparison
| Fact | Honolulu | Mililani Mauka |
|---|---|---|
| Local code | ROH Chapter 14 Article 13 | - |
| Permit trigger | Over 50 cubic yards | - |
| Slope trigger | Over 10 percent | - |
| Permit agency | Honolulu DPP | - |
| Common BMP | Silt fence and hydromulch | - |
| - | - |
Highlighted rows indicate differences between cities.
Honolulu FAQ
Do I need a permit to remove a small backyard slope?
Probably yes if it involves more than 50 cubic yards or a cut over five feet. Smaller landscaping projects often qualify for an exemption but still need erosion controls.
What are the rules during heavy rain?
Active grading must pause and exposed soil must be covered or stabilized. Inspectors can issue stop-work orders if best management practices fail during storms.
Mililani Mauka FAQ
Do I need a plan to cut into my Mililani Mauka hillside for a pool?
Yes. Hillside excavation typically requires a grading permit and an erosion and sediment control plan under Sec. 18A-1.6 given slope and runoff concerns.
How long must controls stay in place?
Temporary controls must remain and function until the site is permanently stabilized with vegetation or other approved measures in the plan.
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