Ascension Parish, LA zoning map, flood zone and property lines by address
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Towns in Ascension Parish: Prairieville, Gonzales, Sorrento.
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 parishwide study for Ascension Parish has 21 FIRM panels, the newest effective August 2007; 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 Ascension house comes from a licensed surveyor and is often on file with the parish or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the Louisiana parish parcel layers (each parish publishes its own), so an Ascension lot shows the same lines the parish assessor draws. Ascension Parish covers about 185,602 acres of land and 8,125 acres of water.
Mapped lines are approximate. The Ascension Parish assessor keeps the parcel record (Ascension Parish website); a licensed surveyor sets the true corners.
Zoning
Ascension Parish zones its unincorporated land, and Gonzales, Sorrento each zone the land inside their limits. ParcelSheet shows the use the parish assessor lists for the lot and links the parish planning and zoning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Louisiana's parish zoning law (Louisiana Revised Statutes 33:4780.40 and following), local governments can allow an accessory dwelling unit on a lot with a house. Whether an Ascension lot can add one depends on its district; the parish planning and zoning 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. Ascension Parish is soil survey area LA005, Ascension Parish, Louisiana, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Ascension Parish needs a permit from the Ascension Parish health unit sanitarian (Louisiana Department of Health onsite wastewater program).
Setbacks
Setbacks in Ascension Parish come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the parish zoning office gives them for the lot's district, and Gonzales and Sorrento for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near an Ascension lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Ascension Parish?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA's parishwide flood map for Ascension Parish has 21 panels, the newest effective August 2007. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Ascension Parish?
Open the Louisiana map, type the address, and the parcel outline from the Ascension Parish 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 Ascension Parish?
Zoning in Ascension Parish is set by the parish for unincorporated land and by each city (such as Gonzales, Sorrento) inside its own limits. ParcelSheet shows the use code the parish assessor lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Ascension Parish?
Under Louisiana's parish zoning law (Louisiana Revised Statutes 33:4780.40 and following), parishes and cities can allow an accessory dwelling unit, and each sets its own rules. In Ascension Parish 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 Ascension Parish?
Yes. A new or changed septic system in Ascension Parish needs a permit from the Ascension Parish health unit sanitarian (Louisiana Department of Health onsite wastewater program). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area LA005 (Ascension Parish, Louisiana).
What can I build on 5 acres in Ascension Parish?
Zoning in Ascension Parish is set by the parish for unincorporated land and each city inside its own limits (such as Gonzales, Sorrento). The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the planning office has the district and its rules. See the Ascension Parish website.
What are the residential setbacks in Ascension Parish (2026)?
Setbacks in Ascension Parish come from the zoning code of the parish, or of the city when the lot is inside city limits: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the zoning office gives them for the district. See the Ascension Parish website.
Next to Ascension Parish: Assumption Parish, East Baton Rouge Parish, Iberville Parish, Livingston Parish, St. James Parish, St. John the Baptist Parish.
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