Bolthole Index

Castro County, Texas

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

41Index Score / 100
#196 of 254 in Texas

Unincorporated Castro County, Texas does not require a county building permit, and Texas counties have no general zoning authority over unincorporated land, so Castro County has none12. That means no county rule sets minimum lot size, setbacks, building height or RV and tiny-home occupancy on your own unincorporated land3. Septic systems go through the Texas Commission on Environmental Quality's Region 1 office in Amarillo, since no city or county in Castro County has been authorized to run its own septic program4.

At a glance

Building permit
Not required in unincorporated Castro County1
Zoning
None; Texas counties have no general zoning power2
Septic permitting authority
TCEQ Region 1 - Amarillo (no local authorized agent)4
RV / tiny home / manufactured home occupancy
No county rule; not zoning-restricted3
Setbacks, minimum lot size, building height
None set by the county3
Owner-builder exemption
Yes, for your own primary residence, if Chapter 233 notice rules apply5
Well permit (High Plains district area)
Exempt under 25,000 gal/day or 17.5 gpm6
Typical home value
$143,6967

Who to call

Also useful

Castro County Judge

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

806-647-4451

100 East Bedford, Room 111, Dimmitt, Texas 79027

Septic permits

TCEQ Region 1 - Amarillo (OSSF Program)

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

806-353-9251

5809 S Western St, Ste 260, Amarillo, TX 79110-4933

Online permits →

Well permits

High Plains Underground Water Conservation District No. 1

Water-well permitting in the portion of Castro County that lies within the district

(806) 762-0181

2930 Ave. Q, Lubbock, TX 79411

Contact details are copied from each office’s official page and were checked against it on September 24, 2026.

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

Unincorporated Castro County does not require a county building permit; Texas counties simply lack the legal authority to require one on ordinary residential construction outside a city1. Castro County's own website lists no building or permitting department, consistent with that statewide framework1. Texas law does let a qualifying county adopt residential inspection standards or a fire code under Local Government Code Chapter 233, but only if the county passes a resolution or order applying it, and no official source confirms whether Castro County has done so, so ask the County Judge's office directly before assuming either way89.

Who handles county government matters in Castro County, and how do you reach them?

Castro County has no planning, zoning or building department, so the County Judge's office at 100 East Bedford, Room 111, Dimmitt, Texas 79027, phone 806-647-4451, is the practical point of contact for county government questions9. County roads are overseen by the Commissioners Court, made up of the County Judge and four precinct commissioners; ask the County Judge's office to route you to the commissioner for your precinct for driveway or road-access questions on a county road9. For septic permitting, contact TCEQ Region 1 in Amarillo, and for a well in the High Plains water district, contact that district directly1011.

Does Castro County have zoning?

Castro County has no zoning authority over unincorporated land: Texas counties generally cannot zone, and only a handful of narrow, geographically specific state laws (covering areas like Padre Island, the Amistad Recreation Area, and a few named lakes) give any county zoning power at all, none of which apply to Castro County212. Because the county has no zoning power, it sets no minimum dwelling size, minimum lot size, setback, lot-coverage limit, building height, or zoning district for unincorporated land3. That is a real answer, not a gap in the research: it follows directly from Texas law giving Castro County no zoning authority to exercise3.

How do septic permits work in Castro County?

Septic systems in Castro County go through the Texas Commission on Environmental Quality's Region 1 office in Amarillo: TCEQ's own countywide authorized-agent lookup shows no city or county authorized agent for Castro County, so TCEQ itself is the permitting authority104. A permit and approved plan are required to construct, alter, repair, extend or operate an OSSF, and the permitting authority must approve or deny the application within 30 days of receiving it13. A single-family home on a tract of at least 10 acres can qualify for the state's 10-acre exemption from permitting if a licensed site evaluator confirms the site, all parts of the system stay at least 100 feet from the property line, effluent stays on the property, there's no nuisance or groundwater pollution, and the home is the only dwelling on the tract14. If part of your land falls in High Plains Underground Water Conservation District No. 1, a well producing less than 25,000 gallons a day or 17.5 gallons a minute is exempt from the district's well permit, though it may still need to be registered6.

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

Yes: Castro County has no zoning authority over unincorporated land, and that includes no county rule restricting RV occupancy, tiny-home occupancy, manufactured-home occupancy, accessory dwellings, or temporary camping on your own unincorporated property3. This follows directly from Texas law giving the county no zoning power to exercise here, not from an absence of research; it is a real answer, not a gap3. It does not remove other requirements that still apply regardless of zoning, such as an OSSF permit for any wastewater system serving the structure4.

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

  1. Confirm with the County Judge's office whether Castro County has adopted any Chapter 233 inspection or fire-code resolution that could apply to your project; none is confirmed as of this writing98.
  2. If you are building and will occupy the home as your own primary residence, note that Texas law exempts an owner acting as their own contractor from the penalty for missing Chapter 233 notice requirements, where that subchapter applies515.
  3. Arrange water: if your land is in High Plains Underground Water Conservation District No. 1, check whether your planned well stays under the 25,000-gallon-a-day or 17.5-gallon-a-minute exemption, or apply for a district permit if it will exceed that116.
  4. Apply for an OSSF (septic) permit through TCEQ Region 1 in Amarillo before you build, unless your tract qualifies for the state's 10-acre exemption1014.
  5. If your driveway will connect to a state highway, submit TxDOT Form 1058 to the local district office and get an executed permit before starting construction on the right of way1617.
  6. For anything on a county road, or for anything not covered above, check with the County Judge's office, which can route you to the right precinct commissioner9.

What to check before you buy land in Castro County

Castro County is flat and open, with 100% of land at 15% slope or less and only 0.1% wooded, so expect wide-open High Plains farmland rather than tree cover1819. Septic soils are decent by the standards of a dry county: about 19.4% of soils have no severe limitations for a conventional drain field, though annual precipitation is low at 19.3 inches and the county spends about 40.3% of years in severe drought, both worth weighing heavily for any well202122. There is no federal land in the county, population density is low at 8.1 people per square mile, and the nearest metro area is about 52 miles away232425. Farmland runs about $2,130 an acre, the typical home value is $143,696, and the effective property tax rate is 1.1%, for a median tax bill around $1,067 a year2672728. A typical home insurance premium runs about $2,489 a year29. Before you close, confirm whether your parcel falls inside High Plains Underground Water Conservation District No. 1 for well rules, and confirm your septic path with TCEQ Region 1, since neither is obvious from a deed alone1110.

Watch-outs

  • Whether Castro County has adopted a Chapter 233 building-inspection or fire-code resolution was not confirmed by any official source; confirm with the County Judge's office before assuming either way98.
  • No official source confirms a Castro County floodplain-development ordinance, administrator, or permit requirement; the county's homepage shows a past flooding disaster declaration but no floodplain permitting process, so ask the County Judge's office directly if your land may be in a flood-prone area9.
  • Driveway access rules for Castro County roads (outside TxDOT state-highway right-of-way) were not confirmed in official sources; ask the County Judge's office which precinct commissioner to contact9.

Sources

  1. Texas county authority for building permits/zoning (Local Gov't Code framework) (2026 county census)
  2. Texas county authority for building permits/zoning (Local Gov't Code framework) (2026 county census)
  3. Texas law on county zoning and building authority
  4. TCEQ - Getting a Permit for an OSSF (Septic System) (2026 county census)
  5. Texas Local Government Code Chapter 233: County Regulation of Housing and Other Structures (2026 county census)
  6. High Plains Underground Water Conservation District No. 1 Adopted Rules, quoted and re-checked
  7. Typical home value (Zillow): Bolthole Index county data
  8. Texas Local Government Code Chapter 233: County Regulation of Housing and Other Structures, quoted and re-checked
  9. Castro County Judge (co.castro.tx.us)
  10. TCEQ Region 1 - Amarillo (OSSF Program) (www6.tceq.texas.gov)
  11. High Plains Underground Water Conservation District No. 1 (hpwd.org)
  12. Local Government Code Chapter 231, County Zoning Authority (Texas statewide rule), quoted and re-checked
  13. Getting a Permit for an OSSF - Such as a Septic System, quoted and re-checked
  14. Getting a Permit for an OSSF - Such as a Septic System, quoted and re-checked
  15. Texas Local Government Code Chapter 233: County Regulation of Housing and Other Structures, quoted and re-checked
  16. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  17. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  18. Share of land at 15% slope or less: Bolthole Index county data
  19. Wooded share of land: Bolthole Index county data
  20. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  21. Annual precipitation: Bolthole Index county data
  22. Share of years in severe drought: Bolthole Index county data
  23. Federal land share: Bolthole Index county data
  24. Population density: Bolthole Index county data
  25. Distance to the nearest metro area: Bolthole Index county data
  26. Farmland value per acre (USDA census): Bolthole Index county data
  27. Effective property tax rate: Bolthole Index county data
  28. Median property tax bill: Bolthole Index county data
  29. Typical home insurance premium: Bolthole Index county data

Written September 24, 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.

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County locator

Castro County in Texas

41
County map
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%Septic soil without severe limits
110,690 acWorkable land screen
0.1%Wooded land
57.9°FAvg temp

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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 Texas law gives zoning power only to certain counties, and Castro County has no zoning ordinance. 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 Texas law gives zoning power only to certain counties, and Castro County has no zoning ordinance. 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 Texas law gives zoning power only to certain counties, and Castro County has no zoning ordinance. 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 Texas law gives zoning power only to certain counties, and Castro County has no zoning ordinance. 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 Texas law gives zoning power only to certain counties, and Castro County has no zoning ordinance. 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 Texas law gives zoning power only to certain counties, and Castro County has no zoning ordinance. 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 Texas law gives zoning power only to certain counties, and Castro County has no zoning ordinance. 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 Texas law gives zoning power only to certain counties, and Castro County has no zoning ordinance. 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 Texas law gives zoning power only to certain counties, and Castro County has no zoning ordinance. 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 Texas law gives zoning power only to certain counties, and Castro County has no zoning ordinance. 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 Texas law gives zoning power only to certain counties, and Castro County has no zoning ordinance. 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 permitNot required

    Under Texas Local Government Code, counties lack authority to require residential building permits in unincorporated areas; Castro County's website shows no building/permitting department, consistent with the statewide framework.

    Texas county authority for building permits/zoning (Local Gov't Code framework) ↗Scouted from the county site, not yet independently re-checked

  • 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.

    Texas county authority for building permits/zoning (Local Gov't Code framework) ↗Scouted from the county site, not yet independently re-checked

Texas rules that apply here

  • Owner-builder exemptionConditional

    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.

    • This is an exemption from the penalty under Section 233.157(c) for failure to provide proper notice; it is not stated to exempt the person from the underlying construction inspections.
    • The individual must build the new residential construction or act as the individual's own contractor.
    • The individual must intend to use the residence as the individual's primary residence.
    • The underlying Chapter 233 subchapter must apply to the county and project.
    “individual acts as the individual's own contractor”
  • 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:”
  • 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

    On-site sewage facilities, including septic systems, throughout Texas

    • In most areas, local governments act as TCEQ-authorized agents and administer the OSSF program.
    • The TCEQ regional office is the permitting authority where a local jurisdiction has not been authorized.
    • Local permitting programs may be more stringent than state minimums.
    “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, including Castro County.

    • A permit and approved plan are required before the listed OSSF activities.
    • An OSSF may be exempt if it meets all applicable planning, construction, and installation standards of 30 TAC Chapter 285 and the 10-acre-rule conditions: site evaluation by a 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; effluent disposed of on the property; and the single-family dwelling is the only dwelling on the tract.
    • Emergency repairs listed by TCEQ are not required to be permitted but must be reported in writing to the permitting authority within 72 hours after repairs begin.
    • OSSFs that are grandfathered under the stated conditions may not need a permit; the owner must confirm with the local permitting authority.
    • A local permitting program may be more stringent than state minimums.

    minimum tract size for 10-acre exemption: >= 10 acres (single-family dwelling and all other stated exemption conditions must also be met) · minimum setback for 10-acre exemption: >= 100 feet from property line (all parts of the OSSF must satisfy the setback) · emergency-repair reporting deadline: <= 72 hours (report in writing after repairs have begun)

    “A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF.”
    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”:”
  • 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.”
  • 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.”
  • 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.”

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.
  • Local zoning — Aggregate local zoning controls across Castro County, including incorporated municipalities and unincorporated areas.
  • Off-grid sanitation — Off-grid sanitation systems in Castro County, Texas.
  • 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.
3 more unanswered
  • 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 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 Texas law gives zoning power only to certain counties, and Castro County has no zoning ordinance. 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.

Off-grid gear

Going off-grid in Castro County means bringing your own water and power. The kit we’d start with:

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How Castro compares in Texas

Compare side-by-side →See all 254 Texas counties ranked →