San Augustine County, TX zoning map, flood zone and property lines by address
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Towns in San Augustine County: San Augustine.
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 San Augustine County has 22 FIRM panels, the newest effective July 2026; 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 a San Augustine 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 Texas statewide parcel layer (StratMap Land Parcels, Texas Geographic Information Office, from each county appraisal district), so a San Augustine lot shows the same lines the appraisal district draws. San Augustine County covers about 339,622 acres of land and 39,449 acres of water.
Mapped lines are approximate. The San Augustine County appraisal district keeps the parcel record; every county's office is on the state's Comptroller county directory; a licensed surveyor sets the true corners.
Zoning
Texas counties cannot zone land. Under Texas Local Government Code chapter 211 only cities zone: in San Augustine County, San Augustine zones the land inside its limits. Land in San Augustine County outside city limits has no zoning district; deed restrictions, the county's subdivision rules (Local Government Code chapter 232), the septic permit and the floodplain rules still apply.
So check city limits first. ParcelSheet shows the use the appraisal district lists for the lot and the town it sits in; the city planning office has the district for land inside a city. What you can build outside city limits in Texas.
ADU and guest houses
Outside city limits in San Augustine County no county zoning limits a guest house or second home on a lot; deed restrictions and the septic permit, which must cover both homes, decide it. Inside a city, the city's zoning code sets 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. San Augustine County is soil survey area TX619, San Augustine and Sabine Counties, Texas, last updated September 2026, on Web Soil Survey.
A new or changed septic system in San Augustine County needs a permit from the San Augustine County authorized agent of the TCEQ on-site sewage facility program, or the TCEQ region office where the county has none, which tests the soil on the lot itself.
Setbacks
Outside city limits in San Augustine County there are no county zoning setbacks; deed restrictions and the county's subdivision rules can still set distances. Inside a city such as San Augustine, the city's zoning code sets the front, side and rear setbacks for the lot's district. ParcelSheet does not draw setback lines.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a San Augustine lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in San Augustine 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 San Augustine County has 22 panels, the newest effective July 2026. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in San Augustine County?
Open the Texas map, type the address, and the parcel outline from the San Augustine County appraisal district 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 San Augustine County?
Zoning in San Augustine County is set only inside city limits, by each city (such as San Augustine); Texas counties cannot zone, so land outside city limits has no zoning district. ParcelSheet shows the use code on the parcel record and names the municipality; the city planning office has the final word.
Can I build an ADU in San Augustine County?
Outside city limits in San Augustine County there is no county zoning, so no zoning rule limits a guest house; deed restrictions, the septic permit and the floodplain rules still apply. Inside a city, the city's zoning code under Texas Local Government Code chapter 211 sets the rule. ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in San Augustine County?
Yes. A new or changed septic system in San Augustine County needs a permit from the San Augustine County authorized agent of the TCEQ on-site sewage facility program, or the TCEQ region office where the county has none. ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area TX619 (San Augustine and Sabine Counties, Texas).
What can I build on 5 acres in San Augustine County?
Texas counties cannot zone land, so check city limits first. If the 5 acres are inside a city (such as San Augustine), that city's zoning sets what can go on them; outside city limits there is no county zoning, and deed restrictions, the county's subdivision and septic rules and the floodplain rules still apply. See the San Augustine County appraisal district.
What are the residential setbacks in San Augustine County (2026)?
Texas counties do not zone, so outside city limits there are no county zoning setbacks; deed restrictions and the county's subdivision rules can still set distances. Inside a city such as San Augustine, the city's zoning code sets the front, side and rear setbacks for the lot's district. ParcelSheet does not draw setback lines. See the San Augustine County appraisal district.
Next to San Augustine County: Angelina County, Jasper County, Nacogdoches County, Sabine County, Shelby County.
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