Environmental Rules in Nassau County, FL (2026)
4 rules for unincorporated Nassau County, Florida.
Verified from official government sources
Stormwater Management
In unincorporated Nassau County, any project that alters natural or man-made drainage collection, storage or conveyance systems, changes land use, adds or resizes structures, or creates a new subdivision must get prior approval through the county's Development Review Process under the Roadway and Drainage Standards Ordinance. Engineering Services reviews plans against Article 10's flood-control and water-quality objectives before work begins.
Nassau County FL Stormwater Drainage Permit Rules
Some RestrictionsNassau County Roadway and Drainage Standards Ordinance §§ 10.1, 10.2
Article 10 of this ordinance shall govern the design and construction or alteration of all drainage systems, natural or man-made, within the unincorporated areas of Nassau County. The following objectives are hereby established in order to protect, maintain and enhance both the immediate and the long-term health, safety, and welfare of the citizens of Nassau County, while allowing landowners re...
Erosion Control
Any site in unincorporated Nassau County where construction disturbs natural cover or topography must control erosion and retain sediment onsite under Section 10.6.5 of the Roadway and Drainage Standards Ordinance. Contractors must follow the state Erosion and Sediment Control Manual, remove trapped sediment once storage is 50 percent full, and immediately stop work and restore the area if sediment escapes the site.
Nassau County FL Erosion and Sediment Control Rules
Some RestrictionsNassau County Roadway and Drainage Standards Ordinance § 10.6.5
10.6.5.1. Where the natural cover or topography of the site has been altered or otherwise disturbed, all necessary erosion prevention and sediment control measures shall be used to retain sediment onsite. 10.6.5.2. These management practices shall meet the design criteria set forth in the most recent version of the Florida Department of Environmental Protection's (FDEP's) Erosion and Sediment C...
Flood Zones
Nassau County's Floodplain Management Ordinance requires a floodplain development permit for any development within a mapped flood hazard area in the unincorporated county, even for structures otherwise exempt from the Florida Building Code. A permit expires if work does not start within 180 days, and building without one, or without required elevation documentation, is a presumed violation.
Floodplain Development Permits, Nassau County
Significant RestrictionsNassau County Code §§ 10½-56, 10½-111
Sec. 10½-56. - Permits required. Any owner or owner's authorized agent (hereinafter "applicant") who intends to undertake any development activity within the scope of this chapter, including buildings, structures and facilities exempt from the Florida Building Code, which is wholly within or partially within any flood hazard area shall first make application to the floodplain administrator, and...
Flood Elevation Requirements
Every structure built within a Special Flood Hazard Area in unincorporated Nassau County must set its finished floor at least one foot above the current 100-year flood level, the controlling minimum under Section 10.8.1 of the Roadway and Drainage Standards Ordinance. Outside flood zones, the floor follows the engineer of record's county-approved drainage plan, or sits at least 18 inches above the adjacent road's centerline if no plan exists.
Nassau County FL Freeboard and Floor Elevation Rule
Some RestrictionsNassau County Roadway and Drainage Standards Ordinance § 10.8
10.8.1. Finished floor elevations shall be constructed at a level one (1) foot or greater than the current 100-year flood level for all structures built within the Special Flood Hazard Areas. In all cases, this shall be the controlling minimum elevation. 10.8.2. In all other areas, the finished floor elevation shall be constructed to the elevations specified in the engineer of record's County a...
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