St. Charles Parish, LA zoning map, flood zone and property lines by address
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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 has 17 FIRM panels covering St. Charles Parish, the newest effective February 2018; coastal V zones, where waves add to the flood, are mapped along its shore.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a St. Charles 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 a St. Charles lot shows the same lines the parish assessor draws. St. Charles Parish covers about 177,755 acres of land and 76,265 acres of water.
Mapped lines are approximate. The St. Charles Parish assessor keeps the parcel record (St. Charles Parish website); a licensed surveyor sets the true corners.
Zoning
St. Charles Parish zones its unincorporated land. 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 a St. Charles 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. St. Charles Parish is soil survey area LA089, St. Charles Parish, Louisiana, last updated September 2026, on Web Soil Survey.
A new or changed septic system in St. Charles Parish needs a permit from the St. Charles Parish health unit sanitarian (Louisiana Department of Health onsite wastewater program).
Setbacks
Setbacks in St. Charles 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.
Hazards that apply
- Storm surge. St. Charles Parish has coastal V zones on its FEMA map, so storm surge reaches its shore. The parish's evacuation zones are on its emergency management site; ParcelSheet shows the FEMA zone and the 3 ft sea level rise map at the lot.
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a St. Charles lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in St. Charles Parish?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA has 17 flood map panels covering St. Charles Parish, the newest effective February 2018. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in St. Charles Parish?
Open the Louisiana map, type the address, and the parcel outline from the St. Charles 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 St. Charles Parish?
Zoning in St. Charles Parish is set by the parish for unincorporated land and by each city 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 St. Charles 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 St. Charles 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 St. Charles Parish?
Yes. A new or changed septic system in St. Charles Parish needs a permit from the St. Charles 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 LA089 (St. Charles Parish, Louisiana).
What can I build on 5 acres in St. Charles Parish?
Zoning in St. Charles Parish is set by the parish for unincorporated land and each city inside its own limits. 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 St. Charles Parish website.
What are the residential setbacks in St. Charles Parish (2026)?
Setbacks in St. Charles 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 St. Charles Parish website.
Next to St. Charles Parish: Jefferson Parish, Lafourche Parish, St. John the Baptist Parish.
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