Building permits, zoning and septic rules in San Augustine County, Texas

Unincorporated San Augustine County does not require a building permit and does not perform building inspections, according to a signed letter from the County Judge confirming county policy¹. Because there is no county permit, there is nothing to be exempt from, so an owner can build their own home or act as their own contractor; state licensing rules for electrical, plumbing, and HVAC trades can still apply to that work¹. This applies only outside incorporated municipalities. The City of San Augustine has adopted its own building codes and lot standards, so a lot inside city limits can face city rules that the county does not impose². The county's rule also does not remove other permits like floodplain-development or driveway-culvert permits where they apply¹.

The County Judge's office is the general point of contact for county administration and confirms in writing that the county requires no building permit and has passed no zoning ordinance¹. Septic systems are not regulated by the county itself; the Angelina & Neches River Authority (ANRA) is the state-authorized agent that permits, inspects, and licenses on-site sewage facilities in San Augustine County¹. Driveway culverts on county-maintained roads go through the Road & Bridge Department, run out of the Commissioner's Office in the courthouse⁵.

San Augustine County has no zoning ordinance; the same signed county letter states the Commissioners Court has not passed any ordinances regulating zoning¹. Because the county has no zoning authority, it sets no rule on minimum dwelling size, minimum lot size, setbacks, lot coverage, building height, accessory dwellings, RV occupancy, tiny-home occupancy, manufactured-home occupancy, or temporary camping⁶. The City of San Augustine does have its own zoning regulations inside city limits, and those do not apply to unincorporated land³. Outside the city, that does not mean every parcel is unrestricted: private subdivisions within the county may carry their own deed restrictions, so verify any subdivision requirements with the County Clerk before you buy¹.

ANRA's OSSF jurisdiction covers all of San Augustine County, including addresses inside the City of San Augustine, plus a Control Zone Rayburn around Sam Rayburn Reservoir that starts at the Corps of Engineers' 179-foot elevation line and extends 2,000 feet outward; if any part of a subdivision falls in that zone, the whole subdivision is in ANRA's jurisdiction⁴. After installation, the installer must request a closing inspection at least five working days before the system is ready and must contact ANRA within five days of finishing installation, or a License to Operate cannot be issued⁹. Aerobic systems qualifying for the Single Family Residential exemption need an installer inspection every four months; otherwise state rules require an active service contract and annual testing⁹. Only 4.6% of San Augustine County's soils are rated free of severe limitations for a conventional septic drain field, so a site evaluation matters more here than almost anywhere else, and a 10-acre exemption from OSSF permitting is available only if every TCEQ condition is met, including all parts of the system staying at least 100 feet from the property line^7,10.

San Augustine County has no zoning authority, so county zoning places no restriction on living in an RV, a tiny home, or a manufactured home on your own land⁶. You still need a legal way to handle sewage, which means an ANRA-permitted OSSF or a confirmed exemption, and a private subdivision you buy into may carry its own deed restrictions that the county does not enforce or waive^1,4.

1. Get a soil site evaluation early; only 4.6% of the county's soils are rated free of severe limitations for a conventional septic drain field⁷.
2. Apply for your OSSF permit through ANRA before you install a septic system; a Permit to Construct must be issued before work starts^1,4.
3. Start construction: San Augustine County requires no building permit or inspection in unincorporated areas, so you or your contractor manage the build directly¹.
4. Request your closing inspection from ANRA at least five working days before the septic system is ready, and contact ANRA within five days after installation finishes⁹.
5. If you need a new driveway culvert on a county-maintained road, call the Commissioner's Office to start the permit process and budget the $500 installation fee for a new culvert⁵.
6. If your driveway instead connects to a state highway, submit TxDOT Form 1058 separately before construction⁸.
7. Verify any subdivision-specific deed restrictions with the County Clerk, since the county's own rules do not cover them¹.

Water and septic: only 4.6% of the county's soils are rated free of severe limitations for a conventional septic drain field, so plan on a site evaluation and possibly an engineered system⁷. Terrain and cover: 98.6% of the county's land sits at 15% slope or less and 76.1% is wooded, with federal land covering 27.3% of the county, largely national forest, which affects which tracts border public land⁷. Climate: San Augustine County averages 54.8 inches of precipitation a year, sees severe drought in about 13.9% of years, and averages 66.3°F annually, with about 25 projected days a year at or above 100°F by mid-century⁷. Access: the county sits about 78 miles from the nearest metro area with a population density of 14.8 people per square mile⁷. Taxes and insurance: the effective property tax rate is about 0.8%, the median property tax bill is about $681 a year, and a typical home insurance premium runs about $1,858 a year⁷.