Union County, FL: flood zone, zoning and property lines by address
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Towns in Union County: Lake Butler.
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 Union County has 42 FIRM panels, the newest effective November 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 Union 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 Florida statewide cadastral (county property appraiser parcels with the Department of Revenue tax roll), so an Union lot shows the same lines the property appraiser draws. Union County covers about 156,090 acres of land and 3,751 acres of water.
Mapped lines are approximate. The Union County Property Appraiser keeps the parcel record; a licensed surveyor sets the true corners.
An example from the county's own records: parcel 3105201600002800 in Lake Butler, a lot with one house, about 22,476 square feet as mapped, the house built in 1950. Open it to see every card ParcelSheet draws for an Union lot.
Zoning
Union County zones its unincorporated land, and Lake Butler zones the land inside its limits. ParcelSheet shows the use the property appraiser 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
Florida Statute 163.31771 lets local governments allow an accessory dwelling unit on a lot with a house. Whether an Union 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. Union County is soil survey area FL125, Union County, Florida, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Union County needs a permit from the Florida Department of Health in Union County, which tests the soil on the lot itself.
Setbacks
Setbacks in Union 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 Lake Butler for land inside its limits.
Hazards that apply
- Wind. The Florida Building Code sets the design wind speed for a house in Union County; the building office applies it at permit.
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near an Union lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Union 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 Union County has 42 panels, the newest effective November 2018. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Union County?
Open the Florida map, type the address, and the parcel outline from the county property appraiser shows on the map with its parcel number and mapped size. The Union County property appraiser keeps the official record. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Union County?
Zoning in Union County is set by the county for unincorporated land and by each city (such as Lake Butler) inside its own limits. ParcelSheet shows the use code the property appraiser lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Union County?
Florida Statute 163.31771 lets counties and cities allow an accessory dwelling unit, and each sets its own rules. In Union 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 Union County?
Yes. A new or changed septic system in Union County needs a permit from the Florida Department of Health in Union County. ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area FL125 (Union County, Florida).
Next to Union County: Alachua County, Baker County, Bradford County, Columbia County.
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