Environmental Rules in Seminole County, FL (2026)
4 rules for unincorporated Seminole County, Florida.
Verified from official government sources
Stormwater Management
Seminole County bans discharging anything but stormwater into its municipal storm sewer system (MS4) and prohibits illicit connections to it entirely. Violations can draw a Class V civil penalty plus, under state law, up to 60 days in jail or a $500 fine.
Illicit Stormwater Discharge Rules in Seminole County
Significant RestrictionsSeminole County Code Sec. 270.397 and Sec. 270.405
No Person may Discharge or cause to be Discharged into the County's MS4 or other watercourses any materials, including but not limited to Pollutants or waters containing any Pollutants that cause or contribute to a violation of applicable water quality standards, other than Stormwater. ... in accordance with Section 53, Code Enforcement, Seminole County Code, any person violating any of the pro...
Erosion Control
Seminole County requires any construction disturbing more than one acre to control stormwater on site under a permitted pollution prevention plan before it reaches the County's storm sewer. Erosion, sediment and pollution controls must stay properly built, maintained and operated throughout the project.
Construction Erosion & Sediment Control in Seminole County
Some RestrictionsSeminole County Code Sec. 270.399(b)
Stormwater Discharges from Significant Construction Activities involving land disturbance of more than one (1) acre must be treated or managed on site in accordance with appropriate federal, state or local permits and regulations, prior to Discharge to the County's MS4 or to Waters of the United States. Erosion, sediment and pollution controls for the construction site must be properly implemen...
Flood Zones
Before approving repairs, additions or alterations to an existing building in a Seminole County flood hazard area, the building official must decide whether the work counts as substantial improvement or repair of substantial damage. A yes triggers full compliance with the Florida Building Code's flood-resistant construction standards under Section 1612 or R322.
Seminole County Flags Substantial Improvement in Flood Zones
Some RestrictionsSeminole County Code, Building and Construction, Appendix A, Sec. 104.2.3
104.2.3 Determination of substantially improved or substantially damaged existing buildings and structures in flood hazard areas. For applications for reconstruction, rehabilitation, repair, alteration, addition or other improvement of existing buildings or structures located in flood hazard areas, the building official shall determine if the proposed work constitutes substantial improvement or...
Flood Elevation Requirements
In Seminole County flood hazard areas, builders must submit an elevation certificate the moment the lowest floor, including any basement, is placed and before any further vertical construction proceeds. Section 110.3.3 ties that certification to Section 1612.4 of the Florida Building Code, Building, and Section R322 of the Florida Building Code, Residential.
Seminole County Requires Lowest Floor Elevation Cert
Some RestrictionsSeminole County Code, Building and Construction, Appendix A, Sec. 110.3.3
110.3.3 Lowest floor elevation. In flood hazard areas, upon placement of the lowest floor, including the basement, and prior to further vertical construction, the elevation certification required in Section 1612.4 and Section R322 of the Florida Building Code, Residential, shall be submitted to the building official.
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