Mililani Town vs Mililani Mauka
How do grading & drainage rules compare between Mililani Town, HI and Mililani Mauka, HI?
Mililani Town has fewer restrictions than Mililani Mauka.
Mililani Town, HI
Honolulu County
Mililani cut, fill, and trenching projects generally require a grading permit under ROH Chapter 18A, with drainage review to protect neighbors and downstream gulches.
View full Mililani Town rules →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 →Key Facts Comparison
| Fact | Mililani Town | Mililani Mauka |
|---|---|---|
| - | - |
Highlighted rows indicate differences between cities.
Mililani Town FAQ
Do ADUs need a grading permit?
Many ADU projects require grading permits due to foundation excavation and drainage modifications around the structure.
Can I reroute roof runoff to my neighbor's lot?
No. Drainage must be directed to approved on-site locations or the public storm system, not onto adjacent properties.
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.
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