Building permits, zoning and land rules in Castro County, Texas
41Index Score / 100 #196 of 254 in Texas
Unincorporated Castro County, Texas generally does not require a county building permit for an ordinary home, but we could not confirm whether the county has adopted the state's conditional residential-inspection program12. Castro County has no general zoning authority over unincorporated land, though the City of Dimmitt keeps its own zoning map and code-inspection fees inside city limits34. TCEQ Region 1 in Amarillo handles septic permits where no local authorized agent operates56.
At a glance
Building permit
Generally not required for an ordinary home; confirm any adopted inspection program12
County administration and the Commissioners Court, which oversees Castro County's road precincts; the general point of contact for anything not otherwise assigned to a state or district agency
OSSF (septic) construction permits for Castro County; TCEQ's own authorized-agent lookup lists Region 1 - Amarillo as Castro County's permitting authority, with no local city or county authorized agent
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Do you need a building permit in Castro County, Texas?
An ordinary home on unincorporated land in Castro County generally does not require a county building permit1. The important unresolved point is inspections: Texas law allows a qualifying county to adopt residential construction standards by resolution or order, but we could not confirm whether Castro County has adopted that program2. If adopted, new construction on a vacant lot requires foundation, framing-and-systems, and completion inspections performed by an authorized inspector2. Ask the County Judge's office whether a current Chapter 233 order applies to the parcel and project before construction begins102. Industrialized or modular housing follows a separate state program, including state codes and an installation-permit option for a buyer acquiring a unit for personal use1112.
Who handles building and permit questions in Castro County?
Castro County does not list a dedicated building department in the available county information, so start with the Castro County Judge at 100 East Bedford, Room 111, Dimmitt, Texas 79027, or 806-647-445110. Ask whether the Commissioners Court has adopted a Chapter 233 residential-inspection order, whether the project needs any county notice, and which precinct commissioner handles access from a county road2. TCEQ Region 1 in Amarillo handles the septic path where no local authorized agent has been designated56. The High Plains Underground Water Conservation District handles well permitting only in the portion of Castro County inside its boundaries9. A driveway connecting to a Texas state highway goes through the local TxDOT district rather than the county13.
Does Castro County have zoning?
Unincorporated Castro County has no general county zoning authority, so county zoning does not set minimum dwelling size, minimum lot size, setbacks, lot coverage, building height, zoning districts, or occupancy rules for RVs, tiny homes, manufactured homes, accessory dwellings, and temporary camping3. That answer is limited to county zoning on unincorporated land; private deed restrictions can still affect a parcel. Inside Dimmitt, the city publishes a zoning map and a code-inspector fee schedule for building permits, so a lot within city limits follows city rules rather than this county answer414. Septic permits for a Dimmitt address still come through the septic route described below, not the city6. We could not confirm the rules of the county's other incorporated places, so ask the city directly. Lack of county zoning also does not remove septic requirements, the conditional state inspection framework, the industrialized-housing program, or state-highway driveway rules721115.
How do septic permits work in Castro County?
TCEQ Region 1 in Amarillo is the septic contact for Castro County where no local authorized agent operates56. A permit and approved plan are normally required to construct, install, alter, extend, repair, or operate an on-site sewage facility, and the permitting authority has 30 days after receiving the application and planning materials to approve or deny them16. A single-family home on at least 10 acres may qualify for an exemption only when every state condition is satisfied, including a professional site evaluation, at least 100 feet between every system component and the property line, on-property effluent disposal, no nuisance or groundwater pollution, and no other dwelling on the tract7. Only about 19.4% of county soils avoid a severe conventional-drain-field limitation, so treat soil evaluation as an early feasibility step rather than assuming a standard field will work17.
Can you live in an RV or tiny home in Castro County?
County zoning does not restrict RV occupancy, tiny-home occupancy, manufactured-home occupancy, accessory dwellings, or temporary camping on unincorporated land in Castro County3. That does not make every setup permit-free: wastewater disposal remains subject to Texas OSSF rules, and industrialized or modular units can fall under the state industrialized-housing program711. Inside an incorporated city, ask the city about zoning, utility connections, placement standards, and occupancy because the county answer does not control municipal land. For an off-grid setup, confirm the sanitation design with TCEQ Region 1 before buying equipment; we could not confirm a separate Castro County rule for composting toilets, holding tanks, or other alternative sanitation systems18.
Building a home in Castro County: the steps, in order
Ask the County Judge's office whether a Chapter 233 residential-inspection order, county-road access requirement, or floodplain process applies to the parcel102.
Confirm whether the tract lies inside High Plains Underground Water Conservation District territory; smaller wells can be permit-exempt there but may still need registration9.
Have the site evaluated for wastewater and apply through TCEQ Region 1 unless every condition of the state septic exemption is met187.
If access connects to a state highway, submit the required driveway application and wait for a fully executed TxDOT permit before work in the right of way13.
Owner-builders should verify trade licensing separately: state exemptions can cover an owner's electrical, plumbing, or air-conditioning work on the owner's residence or homestead, but they are not a blanket exemption from every contractor rule8.
What should you check before buying land in Castro County?
Start with water and septic feasibility. Castro County receives about 19.3 inches of precipitation annually, and severe drought occurs in about 40.3% of years1920. Only about 19.4% of soils avoid severe limitations for a conventional septic drain field, so obtain a site evaluation before choosing a house site17. The land is broadly flat, with 100% at slopes of 15% or less, but flat ground does not answer drainage or floodplain questions21. Castro County participates in the National Flood Insurance Program, but we could not confirm its current flood map status, permit form or fee, so ask the County Judge's office about the specific parcel2210. Also confirm legal access and whether the road is county-maintained or a state highway. Farmland value averages about $2,130 per acre, while the effective property-tax rate is about 1.1% and the median annual property-tax bill is about $1,067232425.
Watch-outs
We could not confirm whether Castro County adopted the conditional Chapter 233 residential-inspection program; ask the County Judge before construction210.
We could not confirm a Castro County floodplain-development permit process or county-road driveway rule; ask the County Judge's office about the parcel and its road frontage10.
The owner-builder provisions are limited: state trade-license exemptions are not a blanket exemption from inspections, permits, or every licensed trade826.
Written October 10, 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.
Castro County highlighted among the Texas counties · colored by Index score
How Castro County scores
Seclusion63100% ev.
Self-Sufficiency1592% ev.
Admin Boringness87100% ev.
Durability32100% ev.
Property Autonomy71100% ev.
Carry Cost8196% ev.
Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →
$144kTypical home
1.1%Property tax
$2,130Land / acre
19.3"Annual rain
40.3% of yrsSevere drought
20.3 / yr (+16.8)Mid-century 100°F days
30.7 daysMid-century dry spell
1.28" (+0.5%)Mid-century 1-day rain
1.25×Wildfire change factor
100%Forward climate coverage
$2,489Home insurance / yr
-3.6% / yrInsurance growth
0%Nonrenewal rate
single ZIP shrunk to state medianInsurance basis
22,509People within 30 min
771,695People within 2 hr
6,824Radius comparison (15 mi)
8.1People / sq mi
0%Federal land
100%Land at 15% slope or less
19.4%Soils rated "not limited" for septic (strict USDA rating)
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Cities and towns in Castro County
Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.
Dimmitt · Hart · Nazareth
Answers from the rulebook for Castro County
What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.
Castro County rules
Zoning districts · by state lawNo county rule
Unincorporated Castro County: no county rule sets this, because Castro County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing bexar.org.
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.”
Minimum dwelling size · by state lawNo county rule
Unincorporated Castro County: no county rule sets this, because Castro County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing bexar.org.
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.”
Minimum lot size · by state lawNo county rule
Unincorporated Castro County: no county rule sets this, because Castro County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing bexar.org.
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.”
Setbacks · by state lawNo county rule
Unincorporated Castro County: no county rule sets this, because Castro County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing bexar.org.
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.”
Lot coverage · by state lawNo county rule
Unincorporated Castro County: no county rule sets this, because Castro County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing bexar.org.
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.”
Building height · by state lawNo county rule
Unincorporated Castro County: no county rule sets this, because Castro County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing bexar.org.
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.”
Living in an RV · by state lawNo county rule
Unincorporated Castro County: no county rule sets this, because Castro County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing bexar.org.
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.”
Camping on your land · by state lawNo county rule
Unincorporated Castro County: no county rule sets this, because Castro County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing bexar.org.
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.”
Tiny homes · by state lawNo county rule
Unincorporated Castro County: no county rule sets this, because Castro County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing bexar.org.
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.”
Manufactured homes · by state lawNo county rule
Unincorporated Castro County: no county rule sets this, because Castro County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing bexar.org.
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.”
Accessory dwellings · by state lawNo county rule
Unincorporated Castro County: no county rule sets this, because Castro County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing bexar.org.
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.”
Well permitLimited
Water wells located in the portion of Castro County within High Plains Underground Water Conservation District No. 1.
The HPWD district covers only a portion of Castro County; this claim does not establish requirements for the remainder of Castro County.
Wells completed or equipped to produce less than 25,000 gallons per day or 17.5 gallons per minute are exempt from HPWD permitting, though they may be registered.
A person may not drill or operate a non-exempt well, or increase production above the permitted maximum, without first obtaining a Board-issued permit.
Permit applications require the prescribed form and applicable fees; the application process includes a district site inspection and submission of a State of Texas Well Report upon completion.
permit-exempt production threshold: < 17.5 gallons per minute (equivalent threshold is less than 25,000 gallons per day) · permit-exempt production threshold: < 25000 gallons per day (equivalent threshold is less than 17.5 gallons per minute)
“The following activities are exempt from permitting requirements under these rules: 1) Drilling or operating a Well that is completed or equipped to produce less than 25,000 gallons of groundwater per day, or 17.5 gpm;”
Building in a floodplainLimited
Development within Castro County's NFIP jurisdiction, including county-administered areas outside incorporated municipalities, to the extent the development is subject to the county's floodplain management regulations.
An official FEMA/TWDB listing opened for this research identifies Castro County as PARTICIPATING in the NFIP, with the historical entry showing NEVER MAPPED and a map date of 06/03/77.
TWDB states that NFIP-participating communities must adopt and enforce a flood damage prevention ordinance or court order meeting or exceeding 44 CFR §60.3 minimum standards.
The opened sources did not provide Castro County's current ordinance text, current flood map status, permit form, permit fee, or detailed permit procedure; those details remain unresolved.
“480737 CASTRO COUNTY* PARTICIPATING NEVER MAPPED 06/03/77 Carroll F Gerber Judge 8066474451”
County-wide zoningAbsent
Texas counties have no zoning authority in unincorporated areas ('there are no zoning regulations'), and Castro County maintains no planning/zoning department.
Industrialized housing or buildings installed in Texas, including purchasers or lessees acquiring a unit for their own or their company’s use.
A person purchasing or leasing an industrialized house or building for their own use or their company’s use may file for an installation permit instead of registering as an industrialized builder.
A person responsible for assembly, connection, and on-site construction for persons other than themselves must be registered as an industrialized builder.
Municipalities may require applicable local permits and licenses before construction begins when the municipality regulates the installation.
“A person who is a retailer of industrialized housing or buildings, or who is responsible for the assembly, connection, and on-site construction and erection of an industrialized house or building for persons other than themselves, must be registered as an industrialized builder. Subcontractors do not require the registration unless required by other applicable state laws. For example, electricians, HVAC contractors, and plumbers must be licensed in accordance with the applicable state law. If you are purchasing or leasing an industrialized house or building for your own use, or your company's use, you may file for an installation permit in lieu of registering as an industrialized builder.”
Owner-builder exemptionConditional
An owner performing electrical, plumbing, or air-conditioning and refrigeration work on the owner's own residence or homestead in Texas.
Electrical work is exempt from state electrician licensing when performed on a dwelling the person owns and resides in.
Plumbing is exempt from state plumbing licensing when performed by the property owner in the property owner's homestead.
Air-conditioning and refrigeration contracting is exempt from the applicable state registration requirements when performed in a building owned solely by the person as the person's home.
These exemptions do not establish a blanket exemption for every construction trade or contractor-regulated activity.
“A person who perform electrical work on a dwelling that they own and reside in is not required by the state to be licensed as electricians.”
2 more reviewed findings on this topic
Conditional — An individual subject to the notice requirements of Texas Local Government Code Chapter 233, Subchapter F, who builds the new residence or acts as the individual's own contractor and intends to use it as the individual's primary residence.
“individual acts as the individual's own contractor”
Conditional — Electrical work on a dwelling owned and occupied by the property owner in Texas.
“A person who perform electrical work on a dwelling that they own and reside in is not required by the state to be licensed”
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:”
One more reviewed finding on this topic
Partial — Industrialized housing and buildings, modules, and modular components built for Texas under the Industrialized Housing and Buildings program.
“Effective 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:”
InspectionsRequired
New residential construction covered by Texas Local Government Code Chapter 233, Subchapter F, in an unincorporated area of a county to which the subchapter applies.
The county must have adopted a resolution or order requiring application of the subchapter.
For construction on a vacant lot, at least three inspections are required: foundation before concrete placement, framing and mechanical systems before drywall or other interior wall covering, and completion.
For qualifying additions, inspections are performed as necessary based on the scope of work.
The builder must contract with an authorized inspector, including a licensed engineer, registered architect, TREC-licensed professional inspector, qualifying municipal plumbing inspector, political-subdivision building inspector, or ICC-certified residential combination inspector.
If required by the county, preconstruction and post-final-inspection notices must be submitted in the prescribed form.
minimum inspections for vacant-lot new construction: 3 inspections (as applicable) · final inspection notice deadline: 10 days (after the final inspection, if required by the county)
“a minimum of three inspections must be performed”
Who permits septicMixed (with conditions)
OSSF permitting, inspection, and administration throughout Texas.
TCEQ administers the program in areas where no local jurisdiction has been authorized.
A local governmental entity may administer the program only after an order, ordinance, or resolution is approved by TCEQ.
The authorized agent administers the program within its approved area of jurisdiction.
Local programs may adopt requirements more stringent than state minimums.
“The authorized agent is responsible for the proper implementation of Texas Health and Safety Code, Chapter 366, 30 TAC Chapter 285, including reviewing OSSF permit applications, conducting inspections, investigating complaints, and more.”
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.”
Septic permitRequired
Construction, installation, alteration, extension, repair, and operation of OSSFs in Texas, subject to stated exemptions and local requirements.
A permit and approved plan are required for construction, alteration, repair, extension, and operation of an OSSF.
A permit is generally required to construct, install, alter, extend, or repair an OSSF.
A local permitting authority must be checked because local programs may be more stringent than state minimums.
The 10-acre exemption requires compliance with 30 TAC Chapter 285 planning, construction, and installation standards; 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 the single-family dwelling must be the only dwelling on the tract.
Emergency repairs listed by TCEQ do not require a permit but must be reported to the permitting authority in writing within 72 hours after repairs begin.
Grandfathered systems may be exempt if installed before the local program was authorized or before September 1, 1989, whichever is earlier, and if they are not creating a nuisance, are not in need of repair, and have had no significant increase in use or other alteration.
The permitting authority must approve or deny planning materials and the permit application within 30 days of receipt.
minimum tract size for 10-acre exemption: >= 10 acres (single-family dwelling and all other stated conditions must be met) · minimum OSSF setback under 10-acre exemption: >= 100 feet from property line (all parts of the OSSF) · emergency repair reporting deadline: <= 72 hours (after repairs have begun) · permit application decision deadline: <= 30 days (from receipt by permitting authority)
“A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF.”
3 more reviewed findings on this topic
Required — Construction, installation, alteration, extension, repair, and operation of OSSFs in Texas, including Castro County.
“A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF.”
Required — Constructing, installing, altering, extending, repairing, or operating an OSSF in Castro County, subject to the Texas OSSF program and any applicable local permitting authority.
“A person must hold a permit and an approved plan to construct, alter, repair, extend, or operate an on-site sewage disposal system.”
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”:”
Septic inspectionRequired
An OSSF installed or operated under the Texas OSSF program in Castro County.
The commission or authorized agent must inspect as necessary to ensure substantial compliance.
An OSSF may not be used until it is inspected and approved.
The permit holder must notify the commission, authorized agent, or designated representative no later than the fifth working day before the proposed operation date of the installation.
The inspection date and time must be mutually agreed by the permit holder and the commission, authorized agent, or designated representative.
Local authorized-agent orders may impose requirements more stringent than state minimums.
advance inspection notice: <= 5 working days (Notice must be given no later than the fifth working day before the proposed operation date.)
“An on-site sewage disposal system may not be used unless it is inspected and approved by the commission or the authorized agent.”
2 more reviewed findings on this topic
Limited — OSSF installation and, where applicable, maintenance inspections in Texas
“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.”
Limited — OSSFs using secondary treatment or drip irrigation in Texas.
“A system using secondary treatment or drip irrigation must be inspected by a valid maintenance company once every four months, or be maintained by the single family homeowner, where allowed.”
Off-grid sanitationLimited
Off-grid wastewater sanitation through an OSSF in Texas.
An OSSF generally requires a permit and approved plan before construction, installation, alteration, extension, repair, or operation.
A qualifying single-family dwelling on a tract of at least 10 acres may use the 10-acre permitting exemption only if every stated site-evaluation, setback, nuisance, groundwater, on-site disposal, and single-dwelling condition is met.
Local permitting authorities may impose requirements more stringent than state minimums.
Emergency repairs are exempt from permitting only for the listed repair types and must be reported in writing within 72 hours after repairs begin.
10-acre exemption tract size: >= 10 acres (all TCEQ conditions must be satisfied) · 10-acre exemption OSSF setback: >= 100 feet from property line (all parts of the 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”:”
One more reviewed finding on this topic
Limited — Composting toilets used as on-site sewage facility treatment systems in Texas.
“Composting toilets will be approved by the executive director provided the system has been tested and certified under NSF International Standard 41 (1999) or under any other standards approved by the executive director.”
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”
Permit processPublished (with conditions)
Constructing a new driveway or revising an existing driveway on the right of way of a Texas state highway.
The applicant should contact the local District TxDOT office.
The applicant must submit Form 1058, Permit to Construct Access Driveway Facilities on Highway Right of Way.
The application must be for the bona fide purpose of securing or changing access to the owner's property, not parking or servicing vehicles on state highway rights of way.
No construction may begin on the right of way until a fully executed driveway permit is received and the applicant gives TxDOT 24-hour notification.
The driveway must comply with the executed permit and applicable regulations; TxDOT inspection must find construction satisfactory.
Where a local public agency has permitting authority, drainage impacts on the state highway system still require TxDOT approval before local approval.
Driveway geometrics, utilities, environmental requirements, wetlands considerations, ADAAG, TAS, and other applicable state and federal laws must be considered.
required form: Form 1058, Permit to Construct Access Driveway Facilities on Highway Right of Way · advance notification: 24 hours (Notification to TxDOT is required before construction on the right of way.) · private residential driveway maximum width: <= 24 feet (Except as increased by permissible radii.) · minimum driveway radius to highway pavement: >= 15 feet
“The applicant shall complete and submit to TxDOT a Form 1058”
One more reviewed finding on this topic
Published (with conditions) — The Texas OSSF permitting process, including septic systems and holding tanks, when applicable to property in Castro County.
“A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF. [...] within 30 days of receipt.”
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.”
One more reviewed finding on this topic
Limited — County zoning authority over unincorporated land in Texas, where a specific statutory grant applies.
“As you suggest, a county has very limited and specific zoning authority, and none that may be used to regulate construction or operation of the proposed facility.”
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.”
One more reviewed finding on this topic
Limited — County fire-code adoption and building-permit authority for specified buildings in unincorporated areas of qualifying Texas counties, including multifamily residential dwellings of four or more units.
“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.”
Inside cities and towns in Castro County
Municipal rules found while researching the county. They apply inside that city or town, not to unincorporated land.
Local zoningPresent (with conditions)
Land within the municipal limits of Dimmitt, Texas, in Castro County.
The cited zoning map is municipal and does not establish zoning for unincorporated Castro County or other municipalities.
“ZONED FOR COMMERCIAL OR INDUSTRIAL, BRICK OR TILE OR APPROVED STEEL STRUCTURE WITH STEEL TRUSS AND DECKING”
Permit feesPublished (with conditions)
City of Dimmitt building, inspection, electrical, plumbing, and mechanical permit fees; this does not establish fees for unincorporated Castro County or other municipalities.
Building fees are calculated by total valuation.
Additional fees apply for after-hours work, reinspection, revised plan review, moving, wrecking, and flammable-liquid-tank permits.
The schedule separately lists electrical, plumbing, and mechanical permit and inspection fees.
building fee for valuation $1 to $1,000: 10 USD · after-hours fee: 35 USD · reinspection fee: 40 USD · minimum electrical permit fee: 25 USD
“Building fee calculated by total valuation:
$1 to $1,000 - $10”
Still unanswered
We looked and could not find an official answer yet. Silence is not permission — ask the county directly.
Certificate of occupancy — Certificates of occupancy or equivalent occupancy approvals in Castro County.
Mandatory utility hookup — Water and wastewater utility connection requirements in Castro County, Texas.
Agricultural exemption — Agricultural exemptions affecting development, construction, subdivision, or land-use requirements in Castro County.
Short-term rentals — Short-term rental use of residential property in Castro County, including unincorporated areas.
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 Castro County, Texas
Is Castro County a good place to live off-grid or homestead?
Castro County scores 41/100 on the Bolthole Index, a marginal county profile. Its strengths: low administrative friction for a quiet rural property and manageable long-term carry cost. Watch-outs: thin water margin (19.3″/yr rainfall) and elevated mid-century heat, water, rain, or wildfire exposure.
Do you need a building permit in Castro County, Texas?
Castro 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 Texas Commission on Environmental Quality (TCEQ) Region 1 - Amarillo. Owner-builders may act as their own contractor to build their home. 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 Castro County?
Living in an RV on your own land in Castro County is allowed: Unincorporated Castro County: no county rule sets this, because Castro County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing bexar.org. 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 Castro County, Texas?
Land in Castro County runs about $2,130 per acre, based on the latest county data.
What is the water situation in Castro County?
Castro County gets about 19.3" of rain a year, with severe drought in roughly 40.3% of years.
How remote is Castro County?
A representative private-land location has about 22,509 people within a 30-minute drive and 771,695 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.
