Terrell County, TX Building Permits, Zoning & Septic

Unincorporated Terrell County, Texas does not require a residential building permit and has no county zoning¹². Terrell County is the local OSSF authority for septic permits countywide, while private wells fall under the Terrell County Groundwater Conservation District³⁴.

At a glance

Building permit: Not required for an ordinary home in unincorporated Terrell County; no county permit or inspection department is listed¹
Zoning: No county zoning applies in unincorporated Terrell County⁵²
Septic permits: Terrell County is the TCEQ-authorized OSSF agent countywide; permits and approved plans are generally required³⁶
RV / tiny home living: Unrestricted by county zoning rules in the unincorporated area, but septic rules still apply²⁷
Minimum size / lot / setbacks: No county zoning minimums in the unincorporated area²
Owner-builder: No explicit county owner-builder exemption was confirmed; septic owner-installation has separate conditions⁸⁶
Private wells: Every well must be registered; non-exempt wells also need an Operating Permit⁴
Septic soils: Only 11.9% of county soils lack severe limits for a conventional drain field⁹

Who to call

Also useful

Terrell County Judge's Office

General county questions and a starting point for current building, septic, floodplain, and county-road contacts

(432) 345-2421

105 E Hackberry St, Sanderson, TX 79848

Contact details are copied from each office’s official page and were checked against it on September 28, 2026.

Do you need a building permit in Terrell County, Texas?

An ordinary home in unincorporated Terrell County does not require a county residential building permit¹. The county does not publish an express no-permit ordinance, so ask the Terrell County Judge's Office to confirm the answer for the parcel before ordering materials¹¹⁰. Texas grants counties only limited building authority, and the County Judge's Office is the right place to ask whether floodplain review, subdivision approval, or another site-specific process applies¹¹¹⁰. The courthouse is at 105 E Hackberry St in Sanderson, and the phone number is (432) 345-2421¹⁰. Modular or industrialized housing follows a separate statewide code program even where the county does not issue a conventional house permit¹².

Who is the Terrell County building department?

Terrell County does not list a building department, building inspector, planning office, or zoning office¹⁵. The practical first call for an unincorporated parcel is the Terrell County Judge's Office at the courthouse in Sanderson, (432) 345-2421¹⁰. Ask that office to identify the current contact for OSSF applications, floodplain questions, subdivision review, and access from a county road; we could not confirm the procedures or fees for those topics. Terrell County itself is TCEQ's authorized OSSF agent for the entire county, but a dedicated septic official and application portal could not be confirmed³. Access from a Texas state highway follows TxDOT's process instead: the applicant submits Form 1058 and must receive an executed permit before beginning work in the highway right of way¹³.

Does Terrell County have zoning?

Unincorporated Terrell County has no county zoning ordinance, and Texas law does not give Terrell County general county zoning authority²¹⁴. County zoning therefore sets no minimum dwelling size, minimum lot size, setback, lot-coverage limit, building-height limit, or zoning district for an unincorporated parcel². County zoning also does not restrict accessory dwellings, manufactured homes, RV occupancy, tiny-home occupancy, or temporary camping there². That answer is limited to county zoning: deed restrictions, easements, subdivision documents, flood hazards, septic design, well rules, and a state-highway access permit can still shape what works on a particular tract. The county's published materials do not confirm whether any separate local rules apply within Sanderson, so a parcel there deserves a direct local inquiry rather than the unincorporated-county answer⁵.

How do septic permits work in Terrell County?

Terrell County is TCEQ's authorized agent for OSSF permitting throughout the county³. A permit and approved plan are generally required before constructing, altering, repairing, extending, or operating a septic system or holding tank⁶⁷. Submit the application and planning materials to the permitting authority; the authority must approve or deny a complete submission within 30 days and explain a denial in writing⁶. The state exemption for a single-family home on at least 10 acres applies only when every condition is met, including a licensed site evaluation, no nuisance or groundwater pollution, on-property effluent disposal, no other dwelling on the tract, and at least 100 feet from every part of the OSSF to the property line⁶. Only 11.9% of Terrell County soils lack severe limits for a conventional drain field, so complete the site evaluation before fixing the house location or system budget⁹.

Can you live in an RV or tiny home in Terrell County?

County zoning does not restrict RV occupancy, tiny-home occupancy, manufactured-home occupancy, accessory dwellings, or temporary camping on land in unincorporated Terrell County². County zoning also sets no minimum dwelling size or minimum lot size there². Sanitation is the important separate issue: an OSSF or holding tank generally needs a permit and approved plan unless every condition of a state exception is satisfied⁷. A large tract alone does not create an automatic septic exemption because the state rule also requires a qualifying single-family dwelling, professional site evaluation, property-line separation, on-site effluent disposal, and protection against nuisance or groundwater pollution¹⁵. Terrell County's published sources do not confirm a certificate-of-occupancy process, so ask the County Judge's Office about the current treatment of the specific structure before moving it onto the property¹¹⁰.

Building a home in Terrell County: the steps, in order

Confirm that the parcel is in unincorporated Terrell County and ask the County Judge's Office about floodplain, subdivision, county-road access, and any site-specific review¹⁰.

Arrange the septic site evaluation and obtain the required OSSF permit and approved plan from Terrell County unless every condition of an exemption applies³⁶.

Register any existing or proposed well with the Terrell County Groundwater Conservation District; obtain an Operating Permit before work on a non-exempt well⁴.

For access onto a state highway, submit Form 1058 to TxDOT and wait for the executed driveway permit before construction in the right of way¹³.

Confirm the final building answer with the county, then build without a county residential permit if the site remains within the ordinary unincorporated-home finding¹.

What should you check before buying land in Terrell County?

Check water and wastewater feasibility before closing. Every private well must be registered with the Terrell County Groundwater Conservation District, while a well used only for domestic purposes is exempt from the Operating Permit requirement but still must meet registration and construction rules⁴. Terrell County receives about 14.5 inches of precipitation annually and experiences severe drought in about 24.2% of years, making a dependable water plan especially important¹⁶¹⁷. Only 11.9% of county soils lack severe limitations for a conventional septic drain field, so price the site evaluation and possible alternative design early⁹. About 75.8% of the land has a slope of 15% or less, but a parcel-level survey still matters for drainage and access¹⁸. The county averages 0.3 people per square mile, and the nearest city of 100,000 or more is about 119 miles from the county center, so contractor travel and material delivery can materially affect a project budget¹⁹²⁰.

Watch-outs

Terrell County does not publish an express no-permit statement; confirm the residential building-permit answer for the parcel with the County Judge's Office¹¹⁰.
Terrell County is the countywide OSSF authority, but a dedicated septic contact or application portal could not be confirmed; call the County Judge's Office for the current application route³¹⁰.
A county-road driveway process and fee could not be confirmed; ask the County Judge's Office for the current Road & Bridge contact, while state-highway access goes through TxDOT¹⁰¹³.

Sources

Written September 28, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

How Terrell County scores

Seclusion91100% ev.

Self-Sufficiency896% ev.

Admin Boringness8290% ev.

Durability39100% ev.

Property Autonomy71100% ev.

Carry Cost8196% ev.

Evidence strength: 97%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$110kTypical home

0.8%Property tax

$1,263Land / acre

14.5"Annual rain

24.2% of yrsSevere drought

56.1 / yr (+37.8)Mid-century 100°F days

37.5 daysMid-century dry spell

1.22" (+8.6%)Mid-century 1-day rain

1.22×Wildfire change factor

100%Forward climate coverage

$1,920Home insurance / yr

-0.1% / yrInsurance growth

0%Nonrenewal rate

single ZIP shrunk to state medianInsurance basis

42Radius comparison (15 mi)

0.3People / sq mi

0%Federal land

75.8%Land at 15% slope or less

11.9%Septic soil without severe limits

179,580 acWorkable land screen

3.5%Wooded land

1.7 tonsBiomass / forest ac

67.2°FAvg temp

Answers from the rulebook for Terrell County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Terrell County rules

Zoning districts · by state lawNo county rule
Unincorporated Terrell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Terrell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.terrell.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Minimum dwelling size · by state lawNo county rule
Unincorporated Terrell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Terrell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.terrell.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Minimum lot size · by state lawNo county rule
Unincorporated Terrell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Terrell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.terrell.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Setbacks · by state lawNo county rule
Unincorporated Terrell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Terrell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.terrell.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Lot coverage · by state lawNo county rule
Unincorporated Terrell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Terrell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.terrell.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Building height · by state lawNo county rule
Unincorporated Terrell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Terrell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.terrell.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Living in an RV · by state lawNo county rule
Unincorporated Terrell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Terrell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.terrell.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Camping on your land · by state lawNo county rule
Unincorporated Terrell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Terrell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.terrell.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Tiny homes · by state lawNo county rule
Unincorporated Terrell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Terrell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.terrell.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Manufactured homes · by state lawNo county rule
Unincorporated Terrell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Terrell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.terrell.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Accessory dwellings · by state lawNo county rule
Unincorporated Terrell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Terrell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.terrell.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Well permitLimited
Water wells within the jurisdiction of the Terrell County Groundwater Conservation District
- All existing and new wells must be registered with the District.
- A new well or well system that is not exempt under Rule 3.5 must obtain an Operating Permit before drilling, construction, or operation.
- Drilling or operating a well used solely for domestic use purposes is exempt from the District's permitting requirements, but exempt wells must still be registered.
- Exempt wells must comply with casing, pipe, fitting, pollution-prevention, and spacing requirements.
- A well loses exempt status if subsequently used for a non-exempt purpose or manner.
livestock/poultry exemption tract size: > 10 acres (well must also be incapable of producing more than 25,000 gallons per day) · livestock/poultry exemption production capacity: <= 25000 gallons per day (well must be on a tract larger than 10 acres) · new-well drilling location tolerance: <= 30 feet (from location specified in registration or permit application)
“All water wells, both existing and new, must be registered with the District and are required to comply with the District’s registration requirements in these Rules.”
Terrell County Groundwater Conservation District Rules ↗Re-checked Sep 21, 2026
Building permitNot required
Terrell County's official site lists no building, permit, or inspection department, consistent with Texas law under which counties cannot require residential building permits in unincorporated areas.
Terrell County, Texas - Official Site ↗Scouted from the county site, not yet independently re-checked
County-wide zoningAbsent
No county planning or zoning office is listed on the official county site; Texas counties have no general zoning authority in unincorporated areas.
Terrell County, Texas - Official Site ↗Scouted from the county site, not yet independently re-checked

Texas rules that apply here

Building code adoptedPartial
Industrialized housing and buildings, modules, and modular components governed by the Texas Industrialized Housing and Buildings program.
- The mandatory state code adoption applies to industrialized housing and buildings, modules, and modular components, not all construction statewide.
- The effective date is July 1, 2024.
- The International Existing Building Code applies to alterations of portable industrialized buildings.
- Manufacturers already certified for Texas must have design-package documents reviewed and approved to the new editions with an approval date on or after July 1, 2024, unless the manufacturer elected to transition before the effective date under Department rule 70.70(a)(5)(B).
- Construction begun on or after July 1, 2024 must comply with the new code editions and approved design packages.
- Construction begun before July 1, 2024, or before a manufacturer's effective transition date, must meet the stated completion, inspection, and labeling deadline to remain eligible for a Texas decal.
effective date: 2024-07-01 · International Building Code: 2021 Edition (including appendices C, F, and K) · International Residential Code: 2021 Edition (including appendices AG, AH, AK, AP, AQ, and AT) · International Fuel Gas Code: 2021 Edition · International Mechanical Code: 2021 Edition · International Plumbing Code: 2021 Edition · International Energy Conservation Code: 2015 Edition · National Electrical Code: 2020 Edition · International Existing Building Code: 2021 Edition (for alterations of portable industrialized buildings)
“July 1, 2024, all industrialized housing and buildings, modules, and modular components shall comply with the following codes, as amended in §70.101 of the IHB Rules:”
Industrialized Housing and Buildings – Adoption of New Code Editions ↗Re-checked Sep 12, 2026
Who permits septicMixed (with conditions)
OSSF and septic-system permitting authority applicable in Terrell County, Texas
- The TCEQ executive director is the permitting authority unless a local governmental entity has an OSSF order, ordinance, or resolution approved by the executive director.
- Where the executive director is the permitting authority, the appropriate TCEQ regional office implements the OSSF chapter.
- Terrell County-specific authorized-agent status was not established from the official pages opened.
“The executive director is the permitting authority unless a local governmental entity has an OSSF order, ordinance, or resolution approved by the executive director.”
On-Site Sewage Facility Rules Compilation ↗Re-checked Sep 21, 2026
One more reviewed finding on this topic
- Mixed — On-site sewage facilities, including septic systems, throughout Texas
  “TCEQ is not often the OSSF permitting authority. [...] The TCEQ regional office will be the permitting authority in locations where a local jurisdiction has not been authorized.”
  Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 12, 2026
Septic permitRequired
Construction, installation, alteration, repair, extension, or operation of an OSSF, including septic systems and holding tanks, in Terrell County
- A permit and approved plan are required unless an exception applies.
- The TCEQ 10-acre exemption requires a licensed site evaluation or professional-engineer evaluation; a single-family dwelling on a tract of at least 10 acres; no nuisance or groundwater pollution; all OSSF parts at least 100 feet from the property line; effluent disposal on the property; and the dwelling is the only dwelling on the tract.
- Emergency repairs listed by TCEQ do not require a permit but must be reported in writing to the permitting authority within 72 hours after repairs begin.
- Grandfathered systems may be exempt if installed before the applicable date, are not creating a nuisance, are not in need of repair, and have had no significant increase in use or other alteration.
- Local permitting programs may be more stringent than state minimums.
minimum tract size for 10-acre exemption: >= 10 acres (single-family dwelling and all other exemption conditions must also be met) · minimum OSSF setback for 10-acre exemption: >= 100 feet from property line (all parts of the OSSF) · emergency-repair reporting deadline: <= 72 hours (after repairs have begun)
“A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF.”
Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 21, 2026
One more reviewed finding on this topic
- Required — Construction, installation, alteration, extension, or repair of an OSSF in Texas
  “A permit is required to construct, install, alter, extend, or repair an OSSF. [...] An OSSF may be exempt from permitting if it complies with all other requirements, including planning, construction, and installation standards of 30 TAC 285 AND meets the “10 acre rule”:”
  Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 12, 2026
Septic inspectionLimited
OSSF installation and, where applicable, maintenance inspections in Texas
- Authorized agents or their designated representatives inspect system installation.
- Some permitting authorities impose more stringent requirements.
- Maintenance-provider inspection and reporting requirements apply to systems and circumstances governed by 30 TAC §285.91(4).
- Electronic monitoring may reduce reporting to every six months where the stated monitoring conditions apply.
reduced maintenance reporting interval with qualifying electronic monitoring: 6 months (only where the system uses the specified electronic monitoring, automatic notification, and disinfection monitoring)
“Many times, the AA has a "designated representative" (DR) to assist them with their responsibilities, which include reviewing plans for constructing, altering, extending or repairing each OSSF; issuing permits; and inspecting system installation. [...] If the system uses an electronic monitor, automatic radio or telephone to notify the maintenance provider of system or component failure and to monitor the amount of disinfection in the system, reporting may be reduced to every six months.”
Basics for Septic Systems ↗Re-checked Sep 12, 2026
Off-grid sanitationLimited
Use of an on-site or other non-public-sewer sanitation system, including an OSSF or holding tank, in Terrell County
- Off-grid sanitation is subject to the OSSF permit and approved-plan requirements unless a stated exemption applies.
- The system must comply with applicable planning, construction, installation, operation, and maintenance standards.
- A 10-acre single-family-dwelling exemption may apply only if all listed TCEQ conditions are satisfied.
- Emergency repairs are exempt from permitting only when they meet the listed emergency-repair conditions and are reported within 72 hours.
- Local permitting requirements may be more stringent.
minimum tract size for 10-acre exemption: >= 10 acres (single-family dwelling and all other exemption conditions must also be met) · minimum OSSF setback for 10-acre exemption: >= 100 feet from property line (all parts of the OSSF)
“Permits are required for on-site sewage facilities (OSSFs) including septic systems and holding tanks.”
Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 21, 2026
Driveway accessRequired
New or modified access driveways connecting property to a Texas state highway right of way.
- A local public agency may receive access driveway permitting authority for state highways, but TxDOT approval remains required for drainage impacts on the state highway system before local approval.
- No access driveway is permitted within a flared or widened right-of-way section at an intersection of a state highway with another highway, road, or street.
- All entrances and exits, including radii, must be confined within the permittee's property frontage.
- One-way 45-to-90-degree driveways are permitted for connections to one-way frontage roads or lane-divided highways; otherwise the driveway angle must be 75 to 90 degrees.
- ADAAG and Texas Accessibility Standards apply.
private residential driveway maximum width: <= 24 feet (Except as increased by permissible radii.) · driveway-to-pavement radius: >= 15 feet
“A driveway must be constructed in accordance with a fully executed driveway permit”
Section 4: Driveway Permits, Design, and Materials ↗Re-checked Sep 12, 2026
Permit processPublished (with conditions)
On-site sewage facilities, including septic systems and holding tanks, located in Terrell County and elsewhere in Texas.
- A permit and approved plan are required to construct, alter, repair, extend, or operate an OSSF.
- Applications and planning materials must be submitted to the permitting authority; the TCEQ regional office is the permitting authority where a local jurisdiction has not been authorized.
- The permitting authority must approve or deny the planning materials and permit application within 30 days of receipt and must provide a written explanation if denied.
- The 10-acre exemption requires compliance with all other 30 TAC Chapter 285 requirements, a site evaluation by a TCEQ-licensed Site Evaluator or professional engineer, service to a single-family dwelling on a tract of at least 10 acres, no nuisance or groundwater pollution, all OSSF parts at least 100 feet from the property line, on-site effluent disposal, and no other dwelling on the tract.
- Emergency repairs are exempt from permitting but must be reported in writing to the permitting authority within 72 hours after repairs begin.
- A grandfathered OSSF may not need a permit if it was installed before a local program was authorized or before September 1, 1989, whichever is earlier, and is not creating a nuisance, does not need repair, and has not had a significant increase in use or otherwise been altered.
- Owner-installation depends on whether the permitting authority allows it; otherwise the owner must own the single-family dwelling and property, must not develop any part of the property for sale or lease, and must meet all permitting, construction, and maintenance requirements. If another person assists, that person must generally be a properly licensed installer, subject to the stated electrician and tank-delivery exceptions.
permit application review deadline: 30 days (The deadline runs from receipt of the planning materials and permit application.) · 10-acre exemption tract size: >= 10 acres (All stated 10-acre-rule conditions must also be met.) · minimum distance of all OSSF parts from property line: >= 100 feet (Applies to the 10-acre exemption.) · emergency-repair reporting deadline: <= 72 hours (Written report required after repairs have begun.)
“A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF.”
Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 27, 2026
One more reviewed finding on this topic
- Published (with conditions) — Constructing a new driveway or revising an existing driveway on the right of way of a Texas state highway.
  “The applicant shall complete and submit to TxDOT a Form 1058”
  Section 4: Driveway Permits, Design, and Materials ↗Re-checked Sep 12, 2026
county zoning authorityLimited
Texas counties adopting zoning regulations for specified unincorporated or otherwise specially defined areas.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
- Other Chapter 231 subchapters address special areas including the Amistad Recreation Area in Val Verde County, military zones, certain lakes, the El Paso Mission Trail Historical Area, Lake Somerville, and Falcon Lake in Zapata County.
- The cited statute was enacted effective September 1, 1987; the Falcon Lake subchapter was added effective June 15, 2007, and amended effective September 1, 2009.
Padre Island distance from publicly owned park or recreational development: <= 2 miles (Area must be outside a municipality and in Cameron or Willacy County.) · Padre Island distance from beach, wharf, or bathhouse: <= 2 miles (The beach, wharf, or bathhouse must be used by at least 500 persons annually.)
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
county building authorityLimited
Texas counties adopting and enforcing fire-code building permits for specified buildings in unincorporated areas and applying residential building-code standards in certain counties.
- Under Section 233.061, the county must have a population over 250,000 or be adjacent to a county with a population over 250,000.
- Under Section 233.062, the fire code applies only to commercial establishments, public buildings, and multifamily residential dwellings consisting of four or more units constructed in an unincorporated area.
- The fire code does not apply to an industrial facility having a fire brigade that conforms to Occupational Health and Safety Administration requirements.
- A covered applicant must submit a plan and a commissioners-court-set application fee; the county must issue or deny the permit within 30 days, and failure to act within 30 days approves the construction for purposes of the subchapter.
- The fire code must conform to the International Fire Code or Uniform Fire Code as those codes existed on May 1, 2005, or establish protective measures exceeding those standards; later editions may be adopted.
- Residential standards under Section 233.152 apply only if the county adopts a resolution or order and the county is within 50 miles of an international border or has a population over 100.
- Those residential standards apply only to new single-family-house or duplex construction beginning after September 1, 2009; manufactured or modular structures governed by Occupations Code Chapters 1201 or 1202 are excluded from the definition of new residential construction.
- A municipality's building code controls in its extraterritorial jurisdiction, and Section 233.152 does not authorize county prior approval of new residential construction or county zoning regulations.
- Fire-code inspection and permit fees may be charged under a fee schedule based on building type, limited to amounts necessary to administer and enforce the subchapter; inspection fees must be reasonable and reflect approximate inspection costs.
county population threshold for fire-code authority: > 250000 persons (A county adjacent to a county over 250,000 also qualifies.) · multifamily residential dwelling threshold: >= 4 units (The fire code applies only to covered buildings constructed in an unincorporated area.) · residential-code border distance: <= 50 miles (Alternative qualification is county population over 100.) · application decision period: 30 days (If the commissioners court does not issue or deny the permit within 30 days after receiving the application and fee, construction is approved for purposes of the subchapter.) · residential standards effective construction date: > 2009-09-01 (Applies only to new residential construction that begins after September 1, 2009.)
“The commissioners court of a county with a population of over 250,000 or a county adjacent to a county with a population of over 250,000 may adopt a fire code and rules necessary to administer and enforce the fire code. [...] The fire code applies only to the following buildings constructed in an unincorporated area of the county: (1) a commercial establishment; (2) a public building; and (3) a multifamily residential dwelling consisting of four or more units.”
Local Government Code Chapter 233, County Regulation of Housing and Other Structures ↗Re-checked Sep 21, 2026

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

Owner-builder exemption — Owner-builder exemptions from residential building requirements in unincorporated Terrell County, Texas
Inspections — Residential building inspections in unincorporated Terrell County, Texas
Certificate of occupancy — Certificates of occupancy for residential buildings in unincorporated Terrell County, Texas
Local zoning — Aggregate local zoning across Terrell County, including any incorporated or subordinate local authority.
Mandatory utility hookup — Required connection to public water or sewer utilities for property in Terrell County

5 more unanswered

Agricultural exemption
Subdividing land
Building in a floodplain
Short-term rentals
Permit fees

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Terrell County, Texas

Is Terrell County a good place to live off-grid or homestead?

Terrell County scores 33/100 on the Bolthole Index, a marginal county profile. Its strengths: deep seclusion — about 42 people within 15 miles and low administrative friction for a quiet rural property. Watch-outs: weak self-sufficiency basics: only 14.5″ of rain a year, in severe drought 24.2% of years and elevated mid-century heat, water, rain, or wildfire exposure.

Do you need a building permit in Terrell County, Texas?

Terrell County does not require a county building permit for a home in unincorporated areas, and it has no county-wide zoning. Onsite septic is permitted by Terrell County (TCEQ authorized agent for on-site sewage). These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Terrell County?

Living in an RV on your own land in Terrell County is allowed: Unincorporated Terrell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Terrell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.terrell.tx.us. Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits. Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Terrell County, Texas?

Land in Terrell County runs about $1,263 per acre, based on the latest county data.

What is the water situation in Terrell County?

Terrell County gets about 14.5" of rain a year, with severe drought in roughly 24.2% of years.

How remote is Terrell County?

A typical private-land location has about 42 people within 15 miles and 249,542 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Building permits, zoning and land rules in Terrell County, Texas

At a glance

Who to call

Do you need a building permit in Terrell County, Texas?

Who is the Terrell County building department?

Does Terrell County have zoning?

How do septic permits work in Terrell County?

Can you live in an RV or tiny home in Terrell County?

Building a home in Terrell County: the steps, in order

What should you check before buying land in Terrell County?

Watch-outs

Sources

Terrell County in Texas

How Terrell County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Terrell County

Terrell County rules

Texas rules that apply here

Still unanswered

Living off-grid in Terrell County, Texas

Is Terrell County a good place to live off-grid or homestead?

Do you need a building permit in Terrell County, Texas?

Can you live in an RV or tiny home on your land in Terrell County?

How much does land cost in Terrell County, Texas?

What is the water situation in Terrell County?

How remote is Terrell County?

How Terrell compares in Texas