Grading & Drainage: Honolulu vs Mililani Mauka
How do grading & drainage rules compare between Honolulu, HI and Mililani Mauka, HI?
Honolulu and Mililani Mauka have similar restriction levels.
Honolulu, HI
Honolulu County
Honolulu County regulates grading and drainage under ROH Chapter 18A, requiring permits, bonds, and inspections for land alteration across Oahu to protect slopes, streams, and downstream properties.
View full Honolulu 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 | Honolulu | Mililani Mauka |
|---|---|---|
| Authority | ROH Chapter 18A | - |
| Permit section | Sec. 18A-2.2 | - |
| No-permit penalty | Sec. 18A-2.4A | - |
| Article 3 | Grubbing and stockpiling | - |
| Bonds | Required for stabilization | - |
| - | - |
Highlighted rows indicate differences between cities.
Honolulu FAQ
When do I need a grading permit on Oahu?
Chapter 18A triggers a grading permit for most earthwork exceeding minimum thresholds in cubic yards or slope, and any fill in drainageways, wetlands, or near streams.
What happens if I grade without a permit?
Sec. 18A-2.4A imposes enhanced penalties, including doubled permit fees, stop-work orders, required restoration, and potential civil fines accruing daily until resolved.
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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