Edgefield County, SC: flood zone, zoning and property lines by address
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Towns in Edgefield County: Edgefield, Johnston, Murphys Estates.
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA's countywide study for Edgefield County has 55 FIRM panels, the newest effective September 2018; no coastal V zones are mapped in it.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for an Edgefield house comes from a licensed surveyor and is often on file with the county or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the county GIS parcel layer (each South Carolina county publishes its own; the state has no statewide parcel map), so an Edgefield lot shows the same lines the county assessor draws. Edgefield County covers about 320,440 acres of land and 4,030 acres of water.
Mapped lines are approximate. The Edgefield County county assessor keeps the parcel record (Edgefield County website); a licensed surveyor sets the true corners.
Zoning
Edgefield County zones its unincorporated land, and Edgefield, Johnston each zone the land inside their limits. ParcelSheet shows the use the county assessor lists for the lot and links the county planning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
The South Carolina Local Government Comprehensive Planning Enabling Act (Title 6, Chapter 29) lets local governments allow an accessory dwelling unit on a lot with a house. Whether an Edgefield lot can add one depends on its district; the county planning office has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Septic and soil
ParcelSheet reads the USDA soil survey at the lot: the soil's name, its septic absorption rating and whether it is prime farmland. Edgefield County is soil survey area SC037, Edgefield County, South Carolina, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Edgefield County needs a permit from the SC Department of Environmental Services onsite wastewater program for Edgefield County, which tests the soil on the lot itself.
Setbacks
Setbacks in Edgefield County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the county zoning office gives them for the lot's district, and Edgefield and Johnston for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near an Edgefield lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Edgefield County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA's countywide flood map for Edgefield County has 55 panels, the newest effective September 2018. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Edgefield County?
Open the South Carolina map, type the address, and the parcel outline from the county county assessor shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Edgefield County?
Zoning in Edgefield County is set by the county for unincorporated land and by each city (such as Edgefield, Johnston) inside its own limits. ParcelSheet shows the use code the county assessor lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Edgefield County?
The South Carolina Local Government Comprehensive Planning Enabling Act (Title 6, Chapter 29) lets counties and cities allow an accessory dwelling unit, and each sets its own rules. In Edgefield County ask the zoning office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in Edgefield County?
Yes. A new or changed septic system in Edgefield County needs a permit from the SC Department of Environmental Services onsite wastewater program for Edgefield County. ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area SC037 (Edgefield County, South Carolina).
Next to Edgefield County: Aiken County, McCormick County, Saluda County.
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