Outside city limits, Trinity County’s permits cover septic systems ($325 for a home, through the County Judge’s office in Groveton), subdivision plats approved by the Commissioners Court, and free heavy haul permits for county roads. The County publishes no building permit for rural houses, but its subdivision rules keep new buildings at least 25 ft from public road rights-of-way. Inside the City of Trinity, City Hall issues building, electrical, gas and plumbing permits.
What needs a county permit in Trinity County?
County approvals
- Septic (on-site sewage facility) permit, with an Authorization to Construct before any installation work
- Recorded affidavit to the public for aerobic systems, and for a 10-acre fee exemption
- Subdivision plat approval for land divided outside the cities
- Heavy haul permit for loads over 30,000 lb, or over 6,000 lb per axle, on county-maintained roads (one per truck)
Not on the County’s list
- Building, electrical or plumbing permits for rural homes and barns
- Plats for agricultural divisions, family tracts of four or fewer parts going to close relatives, or divisions where every tract is over 10 acres
- Work inside Trinity or Groveton
Even without a building permit, the subdivision rules bar any new building closer than 25 ft to the right-of-way of a public road, or 50 ft to a state or federal highway.
Who issues permits in each part of Trinity County?
The septic program runs from the County Judge’s office (936-642-1746, fax 936-642-1046), which hands out the application and receives the permit packet. The County Clerk’s office takes subdivision applications for the Commissioners Court, and the Commissioners’ office (936-642-2743, P.O. Box 484) issues heavy haul permits. The courthouse is at 162 West 1st Street, Groveton (mail: P.O. Box 457, Groveton, TX 75845).
Short on time to read all of this?
Get a free quote →TCEQ lists the County as the septic agent for unincorporated land except around Lake Livingston: on the lake, its islands and land within 2,000 ft of the 131-ft msl contour, the Trinity River Authority (5170 S. FM 1988, Livingston; 936-365-2292) issues septic permits. TCEQ’s Beaumont regional office (409-898-3838) names the City of Trinity among the cities it may serve for septic permits.
| Area | Who handles building permits |
|---|---|
| City of Trinity | City Hall, 101 West Madison Street (936-594-2507). It takes building, electrical, gas and plumbing permit requests through online forms for property inside city limits only: electrical $75, gas $50 and plumbing $50 including inspection; call City Hall for the building permit price. |
| Groveton (county seat) | City Hall, 115 W. Front Street (936-642-1122, weekdays 8 a.m. to 5 p.m.). Its Forms & Permits page lists no permits, so ask City Hall. |
| Unincorporated county | No county building permit; county septic, subdivision, setback and heavy haul rules apply. |
Septic and subdivision fees in Trinity County
| Item | Fee |
|---|---|
| Residential septic permit, standard or multi-family | $325 |
| Commercial or business septic permit | $450 |
| Each additional RV at a business site | $50 |
| Maintenance report or contract filing | $5 each |
| Affidavit (aerobic system or 10-acre exemption) | $25 |
| Subdivision application, major or rural with road | $750, plus $750 on approval |
| Subdivision application, minor | $500, plus $500 on approval |
| Replat of an existing subdivision | $250 plus postage and publishing, plus $250 on approval |
| Recording an approved plat | $250 |
| Engineer review retainer | $3,000 minor, $5,000 rural with road, $6,000 major, $5,000 RV park |
| Heavy haul permit | Free |
Not sure this scope needs a permit?
Get a free quote →A homeowner putting one house on a 10-acre tract in their own name can be exempt from the septic permit fee, but must still file an affidavit, install to state standards, keep a 100 ft buffer from property lines and, for an aerobic system, carry a 2-year maintenance contract. Septic fees are not refunded once the permit is issued, and an application expires one year after filing if the inspection is not complete.
What goes in a Trinity County septic packet
Conventional (in-ground)
- Application signed by the owner on the deed
- Site and soil evaluation by a licensed site evaluator or engineer
- Scale site drawing with buildings, trees, ponds, easements, water wells and property lines
- System design drawing
- Landscape plan and location map
Aerobic (spray)
- Application and site and soil evaluation
- Design by a Registered Sanitarian or Professional Engineer
- Landscape plan and location map
- 2-year maintenance policy
- Affidavit to the public recorded with the County Clerk
The application asks for bedrooms, bathrooms and living area (or, for commercial use, employees and days occupied), the water source, and the registration numbers of the designer, site evaluator, installer and maintenance provider. Incomplete packets are sent back. Aerobic systems must be installed by an Installer II.
Rather talk it over?
Call 1-855-478-4290 →How to get a septic permit in Trinity County
Inside Trinity or Groveton, start with City Hall. Within 2,000 ft of Lake Livingston, the Trinity River Authority issues the septic permit instead of the County.
The evaluation sets the soil class and decides whether a conventional or aerobic system is needed.
A conventional system needs a design drawing; an aerobic system needs one from a sanitarian or engineer.
File it with the County Clerk ($25) and include a certified copy and the maintenance policy.
Approval or denial takes up to 30 days; designs that must go to TCEQ take longer.
The installer must hold the authorization letter before starting any part of the work.
Septic inspections in Trinity County
The applicant or installer tells the inspector when work begins and books an inspection with at least two days’ notice. Lines and tanks must not be covered before inspection, and the system cannot be used until it has been inspected and meets TCEQ standards. The Notice of Approval is issued only after the final inspection, and for aerobic systems it is held until the County has the certified recorded affidavit.
The County’s cover-over checklist asks installers for clear photos of the tanks (outside and inside), distribution lines in open excavation, pump, control panel, chlorinator, compressor numbers, maintenance tag and two-way clean-out, plus a video of the spray heads or drip field and, for conventional systems, laser measurements along each line. A crushed old tank must be photographed before and after it is covered, and the pump-out manifest is sent as a PDF.
Businesses that serve food or alcohol on a septic system file a monthly report and test for BOD and total suspended solids every six months.
Rather not deal with the Trinity County building department?
Get a free quote →Subdivisions, roads and flood maps in Trinity County
Subdivision rules: the Commissioners Court updated the Subdivision Regulations on December 24, 2024. A developer first asks in writing for a site meeting with the Precinct Commissioner at least 15 days before applying. Lots using a private well and septic system must be at least 2 acres; with a public water system and septic, at least 1 acre. Every lot needs at least 100 ft of road frontage, and drainage design must account for the 100-year flood. Utilities may not connect lots in a subdivision until the owner shows a County certificate of approval or exemption.
Heavy hauling: the free heavy haul permit must be filed 3 days before work starts in each precinct, each truck needs its own permit, no hauling is allowed on wet roads, and county roads can be closed to heavy trucks without notice if they are being damaged.
Flood maps: FEMA has finalised new flood maps for Trinity County that take effect on January 22, 2027. The County links FEMA’s Flood Map Changes Viewer so owners can compare the current and future maps.
Texas building code
Texas has no single statewide building code: state law makes the International Residential Code the base code for homes in cities and the International Building Code the base for commercial buildings, with each city choosing the edition and its own amendments, while the National Electrical Code and the energy code apply statewide. Outside city limits most counties issue no building permits for homes. Texas building code rules
Want this handled start to finish?
Get a free quote →Trinity County official resources
- Trinity County, Texas official website
- Trinity County septic permits and fees
- Septic permit process
- Septic (OSSF) forms
- Septic permit packet, March 2024 (PDF)
- Septic cover-over photo checklist (PDF)
- Ten-acre exemption affidavit (PDF)
- Trinity County Subdivision Regulations, December 2024 (PDF)
- County Commissioners and heavy haul permits
- FEMA notice: new Trinity County flood maps (PDF)
- City of Trinity permits
- City of Groveton contact
- TCEQ on-site sewage facility permits
- Trinity River Authority Lake Livingston permits, including septic
Trinity County permit FAQs
Inspections are where schedules slip.
Get a free quote →Do I need a building permit for a house in rural Trinity County?
The County publishes no building permit for unincorporated land. You do need a septic permit, and the house must sit at least 25 ft from a public road right-of-way (50 ft from a state or federal highway).
How much is a septic permit in Trinity County?
$325 for a residential system and $450 for a commercial one; an affidavit for an aerobic system adds $25.
How long does septic approval take?
Up to 30 days for standard, non-standard and proprietary systems; designs that must go to TCEQ take longer.
Is there a 10-acre exemption?
Yes, from the permit fee, for one residence on a 10-acre tract in your name. You still file the affidavit and meet the installation and buffer rules.
Who issues permits in the City of Trinity?
Trinity City Hall (936-594-2507): electrical permits are $75, gas and plumbing $50, and the building permit price is given by City Hall.
Do I need a permit to haul heavy loads on county roads?
Yes, for loads over 30,000 lb or 6,000 lb per axle. The permit is free and must be filed 3 days before the job starts.
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More Texas permitting guides
This guide is provided by Alliance Permitting for general information about Trinity County permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.