Environmental Rules in Onslow County, NC (2026)
2 rules for unincorporated Onslow County, North Carolina.
Verified from official government sources
Flood Zones
Onslow County requires a floodplain development permit before any development activity in a mapped special flood hazard area, covering everything from grading and fill to new buildings, enforced by a dedicated floodplain administrator under Chapter 7.
Onslow County Floodplain Development Permit
Significant RestrictionsOnslow County Code of Ordinances § 7-33
Sec. 7-33. - Establishment of floodplain development permit. A floodplain development permit shall be required in conformance with the provisions of this chapter prior to the commencement of any development activities within special flood hazard areas as determined in section 7-32.
Flood Elevation Requirements
Onslow County requires new and substantially improved buildings in special flood hazard areas to be elevated to two feet above the base flood elevation, or two feet above the highest adjacent grade where no BFE has been set, under the Flood Damage Prevention chapter.
Onslow County Base Flood Elevation Freeboard
Some RestrictionsOnslow County Code of Ordinances §§ 7-5, 7-97(1)
Regulatory flood protection elevation means the elevation, in relation to mean sea level, to which the reference level of all structures and other development located within special flood hazard areas must be protected. Where base flood elevations (BFEs) have been determined, this elevation shall be the BFE plus two feet of freeboard. Where no BFE has been established, this elevation shall be a...
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