Grading & Drainage: Mililani Mauka vs Urban Honolulu
How do grading & drainage rules compare between Mililani Mauka, HI and Urban Honolulu, HI?
Mililani Mauka and Urban Honolulu 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 →Urban Honolulu, HI
Honolulu County
Tower excavations and infill projects in Urban Honolulu must obtain grading permits under ROH Chapter 18A, with dewatering, shoring, and drainage coordination critical in Kakaako and Ala Moana's high water-table conditions.
View full Urban Honolulu rules →Key Facts Comparison
| Fact | Mililani Mauka | Urban Honolulu |
|---|---|---|
| - | - | |
| Authority | - | ROH Chapter 18A |
| Application | - | Sec. 18A-2.2 |
| No-permit penalty | - | Sec. 18A-2.4A |
| Urban concern | - | Dewatering, shoring |
| Bonds | - | Required |
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.
Urban Honolulu FAQ
Does a Kakaako tower need a grading permit even on a small lot?
Yes. Basement excavation easily exceeds Chapter 18A thresholds, and Sec. 18A-2.2 requires a full permit application including hydrology and shoring plans before work.
How is dewatering handled in Urban Honolulu excavations?
Grading plans must coordinate with ROH Chapter 43 Article 11 stormwater rules. Dewatering discharges typically require separate NPDES coverage and cannot be released untreated.
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