Grading & Drainage: Mililani Mauka vs Waipahu
How do grading & drainage rules compare between Mililani Mauka, HI and Waipahu, HI?
Mililani Mauka and Waipahu have similar restriction levels.
Mililani Mauka, HI
Honolulu County
Mililani Mauka grading, grubbing, stockpiling, and drainage work is regulated under ROH Chapter 18A, which requires permits, bonds, and inspections for qualifying land-disturbing activity.
View full Mililani Mauka rules →Waipahu, HI
Honolulu County
Waipahu land disturbing activities require grading permits under ROH Chapter 18A, which governs permits, bonds, inspections, and drainage review for all qualifying work.
View full Waipahu rules →Key Facts Comparison
| Fact | Mililani Mauka | Waipahu |
|---|---|---|
| - | - |
Highlighted rows indicate differences between cities.
Mililani Mauka FAQ
Do I need a grading permit for a small Mililani Mauka yard terrace?
If the work meets Chapter 18A's volume, slope, or height thresholds, a grading permit is required along with any necessary erosion control plan.
What about a contractor stockpiling soil on my lot?
Stockpiling above the thresholds in Article 3 requires a permit under Chapter 18A, and failing to permit can lead to penalties under Sec. 18A-2.4A.
Waipahu FAQ
Does adding fill for a small Waipahu addition need a permit?
Yes, if the fill or grading exceeds thresholds in Chapter 18A. Even modest grading associated with additions typically requires a grading permit, so confirm with permitting before starting.
Can my neighbor's runoff come onto my lot?
Grading permit drainage review is intended to prevent concentrated runoff onto neighbors. If your neighbor's grading changed drainage, document it and contact the Department of Planning and Permitting.
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