Bolthole Index

Mason County, Texas

Building permits, zoning and septic rules in Mason County, Texas

66Index Score / 100
#63 of 254 in Texas

Unincorporated Mason County, Texas has no general building-permit requirement and no county zoning ordinance, because Texas gives most counties no zoning power and Mason County does not meet the narrow population thresholds for a county building or fire code.12 Every new on-site sewage facility (septic system) still needs a county permit, regardless of the size or number of acres in the property.3 The Sanitation & Floodplain Department also administers floodplain development permits for sites in a mapped flood hazard area.4

At a glance

Building permit
Not required in unincorporated Mason County; no county building or fire code applies here15
Zoning
None outside the City of Mason; the county has no zoning ordinance6
Septic (OSSF) permit
Required for every new system, regardless of acreage73
Floodplain permit
Required for construction in a mapped flood hazard area4
RVs, tiny homes, manufactured homes
Unrestricted by county zoning in unincorporated Mason County2
Minimum lot size, setbacks, building height
None set by the county outside city limits2
Driveway onto a state highway
TxDOT Form 1058 permit required before construction8

Who to call

Septic permits

Mason County Sanitation & Floodplain Department (OSSF Designated Officer)

On-site sewage facility (OSSF/septic) permits and floodplain development permits for unincorporated Mason County

(325) 347-2477

mcdrossf@co.mason.tx.us

201 Ft. McKavett St., Mason, TX 76856

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

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

Texas gives most counties no authority to require a general building permit: only a county over 250,000 people (or adjacent to one) may adopt a fire-code permit for certain commercial and multifamily buildings, and county residential building-code standards apply only where a county opts in near an international border.5 Mason County has about 3,931 residents, and its official Sanitation & Floodplain page lists only OSSF (septic) and floodplain permits for unincorporated land, with no separate building-permit process.91 Treat that as a strong signal rather than a written guarantee: Mason County's own site does not carry a sentence stating outright that no building permit is required, so call the Sanitation & Floodplain office to confirm before you build.10

Who handles septic, floodplain and other permits in Mason County, and how do you reach them?

Mason County's Sanitation & Floodplain Department, through its OSSF Designated Officer, administers septic permits for Mason County.11 Reach the office at (325) 347-2477, by email at mcdrossf@co.mason.tx.us, or at 201 Ft. McKavett St., Mason, TX 76856 at the county courthouse.10 The same department administers the floodplain-development-permit program, required before construction or a substantial improvement in a mapped flood hazard area.410 Land inside the City of Mason answers to a different office: the city's own Building Permits / Inspection Department enforces zoning and adopted International Building Codes within city limits, under city ordinances 10-312 and 13-322.1213

Does Mason County have zoning?

Unincorporated Mason County has no county zoning ordinance: Texas law gives counties zoning power only in a handful of specific situations, and Mason County is not one of them.6 Because the county has no zoning authority over unincorporated land, it sets no minimum lot size, no setbacks, no lot-coverage limit, no building-height limit and no zoning districts, and RVs, tiny homes and manufactured homes are unrestricted by county zoning outside city limits.2 That is a real answer, not a research gap: it follows directly from Texas law giving a county like Mason no general zoning power.2 Inside the City of Mason, the opposite is true: city ordinance divides Mason into nine zoning districts, including a dedicated mobile-home-park district, so a parcel inside city limits is zoned even though the surrounding county is not.13

Zoning is not the only land-use rule outside the city: Mason County has subdivision regulations for land outside incorporated cities, so unless an exemption applies, subdivided land cannot be sold until the Commissioners Court approves the application and a plat is filed with the Mason County Clerk14. A division of a tract that was never platted, used primarily for agriculture, ranching, wildlife management or timber, and meeting the minimum frontage rules can be exempt, but the exemption ends if the land stops being used that way15.

How do septic permits work in Mason County?

Every new on-site sewage facility (OSSF) in Mason County needs a permit, regardless of the size or number of acres in the property.37 The county's OSSF Designated Officer administers the local program, reviews the application and issues an Authorization to Construct, valid for one year, before work can begin.1116 Installation must be inspected before the system is covered; the authorized agent's inspection checks compliance with TCEQ criteria or the approved local order, whichever is stricter.1617 Fees are $210 for a single-family residential system and $410 for any other system type, plus a re-inspection fee equal to half the permit fee, payable by check or money order only.18 Texas has a narrow statewide permit exemption for a qualifying single-family OSSF on at least 10 acres, but Mason County's rule requires all new systems to be permitted regardless of acreage.193 With only 4.2% of the county's soils free of severe limits for a conventional septic drain field, expect many sites to need an engineered or alternative system.20

A homeowner may install their own system for a single-family home they own on land they own, with no part of the property developed for sale or lease, but the county permit is still required and construction must not start before approval2122. Call the county's designated representative at least 5 working days ahead of the inspection that must happen before the system is covered22.

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

Yes, with conditions: unincorporated Mason County has no zoning ordinance, so it sets no rule restricting RV, tiny-home or manufactured-home occupancy on private land, a direct result of Texas law giving the county no general zoning power.2 The same lack of zoning means there is no minimum dwelling size and no accessory-dwelling rule in unincorporated Mason County.2 Two things still apply everywhere in the county: any wastewater system connected to the RV, tiny home or manufactured home still needs an OSSF permit from the Sanitation & Floodplain office, and a site inside a mapped flood hazard area still needs a floodplain permit first.34 Inside the City of Mason, the opposite is true: city zoning includes a dedicated mobile-home-park district, so manufactured-home placement is restricted to zoned areas within city limits.13

Building on land in Mason County: the steps, in order

  1. Confirm the parcel is outside the City of Mason's limits; the county has no zoning while the city does, so the rules differ sharply on either side of the line.613
  2. Call the Sanitation & Floodplain office at (325) 347-2477 before you design a wastewater system: every new OSSF needs a county permit, whatever the acreage.103
  3. Budget $210 for a single-family OSSF permit, or $410 for any other system type, payable by check or money order.18
  4. Get your Authorization to Construct before work starts, and schedule the required installation inspection with the Sanitation & Floodplain office in advance.16
  5. Ask the Sanitation & Floodplain office whether the parcel sits in a mapped flood hazard area; if it does, a floodplain development permit, valid for one year, is required before construction.4
  6. If your driveway will connect to a state highway, file TxDOT Form 1058 and wait for a fully executed permit before you build it.8
  7. No county building permit or inspection has been confirmed as required, but call the Sanitation & Floodplain office to double check before you start, since the county's own pages do not say so in writing.110

What to check before you buy land in Mason County, Texas

Soils are a real constraint here: only 4.2% of Mason County has soils without severe limits for a conventional septic drain field, so plan on an engineered or alternative OSSF system on most parcels.20 The county sees severe drought in roughly 31.4% of years, a dry stretch worth planning for with both a private well and any pond or tank.23 Land is gentle -- 91.3% sits at 15% slope or less -- and about a quarter of the county, 25.6%, is wooded.2425 Mason County is rural and low-density, with 3,931 residents at about 4.2 people per square mile, roughly 90 miles from the nearest metro area.92627 A driveway onto a state highway needs a TxDOT permit before construction, not just a county sign-off.28 Property taxes run an effective 0.8% rate, with a median annual bill of $2,239.2930

Watch-outs

  • Mason County's own pages don't state in writing that no building permit is required in unincorporated areas; treat that as a strong reading, not a guarantee, and confirm with the Sanitation & Floodplain office.110
  • Mason County's septic rule is stricter than the state's 10-acre OSSF exemption: "regardless of the size or number of acres," every new OSSF here needs a county permit.3
  • Land inside the City of Mason is zoned, permitted and inspected very differently from the surrounding unincorporated county; confirm which side of the city limits a parcel sits on before you rely on this guide.13
  • Mason County's subdivision regulations apply outside city limits, so confirm exemption status with the county before splitting and selling a tract14.

Sources

  1. Mason County - Sanitation/Floodplain (OSSF) (2026 county census)
  2. Texas law on county zoning and building authority
  3. Mason County Sanitation & Floodplain, quoted and re-checked
  4. Mason County Development Permit Application, quoted and re-checked
  5. Local Government Code Chapter 233, County Regulation of Housing and Other Structures (Texas statewide rule), quoted and re-checked
  6. Mason County, Texas (official) (2026 county census)
  7. Mason County Sanitation & Floodplain (2026 county census)
  8. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  9. County population: Bolthole Index county data
  10. Mason County Sanitation & Floodplain Department (OSSF Designated Officer) (co.mason.tx.us)
  11. Mason County Sanitation & Floodplain, quoted and re-checked
  12. Building Permits / Inspection Department, quoted and re-checked
  13. City of Mason Zoning Ordinance, Section 1: Scope, quoted and re-checked
  14. Mason County Subdivision Regulations, quoted and re-checked
  15. Mason County Subdivision Regulations, quoted and re-checked
  16. How to obtain an On Site Sewage Facility (OSSF) Permit in Mason County, quoted and re-checked
  17. How to Become a Texas On-Site Sewage Facility (Septic System) Authorized Agent, quoted and re-checked
  18. How to obtain an On Site Sewage Facility (OSSF) Permit in Mason County, quoted and re-checked
  19. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
  20. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  21. Getting a Permit for an OSSF - Such as a Septic System, quoted and re-checked
  22. Mason County Sanitation & Floodplain, quoted and re-checked
  23. Share of years in severe drought: Bolthole Index county data
  24. Share of land at 15% slope or less: Bolthole Index county data
  25. Wooded share of land: Bolthole Index county data
  26. Population density: Bolthole Index county data
  27. Straight-line distance from the county center to the nearest city of 100,000+ people: Bolthole Index county data
  28. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  29. Effective property tax rate: Bolthole Index county data
  30. Median property tax bill: Bolthole Index county data

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.

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Compared with neighboring counties

Like all 6 of its neighbors, Mason County has no countywide zoning.

RuleMason CountyMcCulloch CountyLlano CountyGillespie CountyMenard CountySan Saba CountyKimble County
Building permitNot requiredNot requiredLimitedLimitedNot requiredLimitedNot required
County zoningNoNoNoNoNoNoNo
Septic permitsCounty OSSF Designated OfficerMcCulloch CountyCounty Development Dept.County SanitationMenardCounty On-Site Sewage Facility officeKimble

County locator

Mason County in Texas

66
County map
Mason County highlighted among the Texas counties · colored by Index score

How Mason County scores

Seclusion85100% ev.
Self-Sufficiency3996% ev.
Admin Boringness8290% ev.
Durability35100% ev.
Property Autonomy71100% ev.
Carry Cost7496% ev.

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

$365kTypical home
0.8%Property tax
$2,655Land / acre
28"Annual rain
31.4% of yrsSevere drought
38.7 / yr (+27.1)Mid-century 100°F days
27 daysMid-century dry spell
1.95" (+9.1%)Mid-century 1-day rain
1.36×Wildfire change factor
100%Forward climate coverage
$2,201Home insurance / yr
3.5% / yrInsurance growth
0%Nonrenewal rate
single ZIP shrunk to state medianInsurance basis
2,518People within 30 min
655,640People within 2 hr
3,402Radius comparison (15 mi)
4.2People / sq mi
0.2%Federal land
91.3%Land at 15% slope or less
4.2%Soils rated "not limited" for septic (strict USDA rating)
18,969 acWorkable land screen
25.6%Wooded land
7.7 tonsBiomass / forest ac
66°FAvg temp

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Cities and towns in Mason 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.

Mason

Answers from the rulebook for Mason County

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

Mason County rules

  • Owner-builder exemptionConditional

    Homeowner installation or repair of an on-site sewage facility in Mason County, Texas.

    • Mason County's official application packet expressly contemplates a homeowner installing the OSSF themselves, but Mason County requires all new OSSFs to be permitted regardless of property size or acreage.
    • Do not begin construction before application approval; unauthorized construction can result in civil or administrative penalties.
    • An inspection is required before covering the system, and the Mason County designated representative must be contacted at least 5 working days in advance.
    • A re-inspection fee equal to one-half of the permit amount applies each time the system must be re-inspected and is payable by the installer or the homeowner if the homeowner installs the OSSF themselves.
    • The county packet is marked Updated October 2024; no effective date is stated.

    re-inspection fee: one-half of the permit amount permit amount (applies for each required re-inspection)

    “the homeowner if the homeowner installs the OSSF themselves”
  • Local zoningVaries (with conditions)

    Aggregate local land-use controls in Mason County: the City of Mason administers zoning within its corporate limits, while Mason County's cited regulations govern subdivision of land outside incorporated cities. This aggregate does not mean Mason County administers the City's zoning ordinance.

    • City of Mason zoning applies within the City of Mason corporate limits.
    • Mason County subdivision and development regulations apply to land outside the limits of incorporated cities.
    • The cited county regulations concern subdivision and development, not a countywide zoning ordinance.
    “The zoning standards contained herein, together with all amendments, shall officially constitute the zoning regulations of the City of Mason as adopted. This ordinance is adopted pursuant to authority set forth in Article 1011a of the Revised Civil Statutes of Texas, and shall be applicable to all property within the corporate limits of Mason, Texas; herein referred to as the "City."”
  • Zoning districts · by state lawNo county rule

    Unincorporated Mason County: no county rule sets this, because Mason 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 co.mason.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Minimum dwelling size · by state lawNo county rule

    Unincorporated Mason County: no county rule sets this, because Mason 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 co.mason.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Minimum lot size · by state lawNo county rule

    Unincorporated Mason County: no county rule sets this, because Mason 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 co.mason.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Setbacks · by state lawNo county rule

    Unincorporated Mason County: no county rule sets this, because Mason 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 co.mason.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Lot coverage · by state lawNo county rule

    Unincorporated Mason County: no county rule sets this, because Mason 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 co.mason.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Building height · by state lawNo county rule

    Unincorporated Mason County: no county rule sets this, because Mason 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 co.mason.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Living in an RV · by state lawNo county rule

    Unincorporated Mason County: no county rule sets this, because Mason 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 co.mason.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Camping on your land · by state lawNo county rule

    Unincorporated Mason County: no county rule sets this, because Mason 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 co.mason.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Tiny homes · by state lawNo county rule

    Unincorporated Mason County: no county rule sets this, because Mason 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 co.mason.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Manufactured homes · by state lawNo county rule

    Unincorporated Mason County: no county rule sets this, because Mason 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 co.mason.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Accessory dwellings · by state lawNo county rule

    Unincorporated Mason County: no county rule sets this, because Mason 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 co.mason.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Who permits septicCounty

    On-site sewage facility administration in Mason County, Texas.

    • The county page identifies a Mason County OSSF Designated Officer.
    • TCEQ states that an authorized agent administers the OSSF program within the agent's area of jurisdiction.
    • The local governmental entity's delegation must be approved by TCEQ under the applicable state process.
    “MASON COUNTY SANITATION & FLOODPLAIN ON-SITE SEWAGE FACILITIES | SEPTIC PERMITS & DEVELOPMENT | FLOODPLAIN PERMITS Mason County OSSF Designated Officer”
  • Septic permitRequired

    All new on-site sewage facilities in Mason County, Texas, regardless of property size or acreage.

    • The source attributes the requirement to Mason County Rules for On-Site Sewage Facilities amended by-law Section 10(a).
    • The quoted rule applies to all new OSSF facilities and contains no lot-size or acreage exception.

    property size threshold: all sizes and acreages (none stated)

    “In reference to the Mason County Rules for On-Site Sewage Facilities amended by-law Section 10 (a), "Regardless of the size or number of acres contained in the property, all new on-site sewage facilities must be permitted."”
  • Agricultural exemptionAvailable (with conditions)

    Division of a tract into agricultural tracts under Mason County subdivision regulations.

    • The property must not have been previously platted.
    • The resulting tracts must meet the minimum frontage requirements established by the regulations.
    • The owner must not lay out any part of the tract as streets, alleys, squares, parks, or other parts intended for public use or for use by purchasers or owners of lots fronting on or adjacent to those areas.
    • The land must be used primarily for agricultural use as defined by Section 1-d, Article VIII, Texas Constitution, or for farm, ranch, wildlife management, or timber production use within the meaning of Section 1-d-1, Article VIII, Texas Constitution.
    • If the tract ceases to be used primarily for the specified agricultural, farm, ranch, wildlife management, or timber production use, the subdivision-regulation requirements apply.
    “A division of a tract of land into agricultural tracts is exempt if:”
  • Subdividing landRegulated (with conditions)

    Subdivision of land outside the boundaries of incorporated cities in Mason County, Texas.

    • A developer must submit an application to the Mason County Commissioners Court unless the subdivision is exempt by state law, the regulations, or a discretionary exemption.
    • Unless exempt, subdivided land may not be sold or conveyed until application approval is received and an approved plat is filed with the Mason County Clerk's Office.
    • Subdivisions in a municipality's extraterritorial jurisdiction must also comply with applicable municipal regulations and interlocal agreements; generally, the more stringent regulations control.
    • The regulations state that platting requirements do not apply to listed divisions if the property was not previously platted and resulting tracts meet the regulations' minimum frontage requirements.
    “STANDARDS FOR ALL SUBDIVISIONS SITUATED OUTSIDE THE BOUNDARIES OF ANY INCORPORATED CITY”
  • Building in a floodplainRequired

    Proposed construction and substantial improvements in an identified flood plain or flood hazard area administered by the Mason County Floodplain Administrator.

    • The applicant must provide one copy of the plans and specifications if the proposed construction is in a flood plain.
    • The permit is valid for one year from issuance and must be renewed if work is not completed within that period.
    • The Floodplain Administrator determines whether the property is in an identified flood hazard area, whether additional information is required, whether other federal, state, or local permits are required, and whether other county regulations apply.
    • An exemption certificate may be issued instead of permit approval where applicable.

    permit validity: 1 year (From date issued)

    “APPLICANT MUST SUPPLY ONE COPY OF THE PLANS & SPECIFICATIONS OF THE PROPOSED CONSTRUCTION IF IN A FLOOD PLAIN. THIS PERMIT IS VALID FOR ONE YEAR FROM DATE ISSUED AND WILL NEED TO BE RENEWED IF WORK IS NOT COMPLETED AT THAT TIME.”
  • Permit feesPublished (with conditions)

    Mason County OSSF permits for new installations and major repairs of existing on-site sewage facilities.

    • Single-family residential systems are charged $210.00.
    • All other system types, including commercial and multi-family dwellings, are charged $410.00.
    • A re-inspection fee equal to one-half of the permit fee applies for each re-inspection.
    • Fees are non-refundable; payment must be by personal check, cashier's check, or money order; cash is not accepted.

    single-family residential permit fee: 210 USD · other system permit fee: 410 USD (Commercial, multi-family dwellings, etc.) · re-inspection fee: 1/2 of permit fee USD (For each required re-inspection)

    “A permit is required for ALL new installations and major repairs of existing OSSF. • Single Family Residential Fee: $210.00 • All other type systems: $410.00 (Commercial, multi-family dwellings, etc.) • Re-inspection Fee: ½ of Permit Fee”
  • Permit processPublished (with conditions)

    Mason County OSSF permit applications for new installations and major repairs.

    • Obtain application forms from the Mason County Designated Representative.
    • Submit completed forms and the applicable fee to the Designated Representative.
    • The application and floor/construction plans are reviewed before an Authorization to Construct is issued.
    • The Authorization to Construct is valid for one year from issuance.
    • Construction may begin only after approval; installation inspection is required before the system is covered.
    • The Mason County Designated Representative must be contacted at least five working days in advance to arrange inspection.
    • After a successful inspection, a Notice of Approval is issued within approximately five working days.
    • All fees must be paid before the Notice of Approval is issued.

    authorization to construct validity: 1 year (From date of issue) · inspection notice: >= 5 working days (Before installation inspection) · notice of approval timing: <= 5 working days (Approximately, after successful inspection)

    “Upon approval of the application and plans, an Authorization to Construct will be issued. The Authorization to Construct is valid for one year from the date of issue.”
  • County-wide zoningAbsent

    Texas counties have no general zoning authority in unincorporated areas; Mason County shows no zoning/planning department.

    Mason County, Texas (official) ↗Scouted from the county site, not yet independently re-checked

Texas rules that apply here

  • Building permitLimited

    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.”
  • 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:”
  • 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.”
    2 more reviewed findings on this topic
    • Required — OSSFs issued an authorization to construct in Texas, including facilities administered by an authorized agent in Mason County.
      “They perform site evaluations (when it is part of their job duties), complaint investigations, system evaluations, and inspections of OSSFs that have been issued an authorization to construct to ensure the installation of the OSSF meets the criteria established by the TCEQ, or by the Authorized Agent Order approved by the TCEQ, whichever is more stringent.”
    • 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.”
  • Well permitLimited

    Drilling, equipping, operating, or completing a water well, or substantially altering a well or well pump, where the well is within a groundwater conservation district in Texas.

    • A groundwater conservation district must require a permit except as provided by Texas Water Code §36.117.
    • A district may not require a permit or permit amendment for maintenance or repair that does not increase production capability above the authorized or permitted production rate.
    • Permit applications must be in writing and sworn.
    • Whether a particular private well is exempt or subject to additional district requirements depends on the applicable groundwater conservation district's rules.

    permit application form: in writing and sworn

    “Except as provided by Section 36.117, a district shall require a permit for the drilling, equipping, operating, or completing of wells or for substantially altering the size of wells or well pumps.”
  • 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”
  • 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 Mason County

Municipal rules found while researching the county. They apply inside that city or town, not to unincorporated land.

  • Building code adoptedPartial

    Building construction and inspections within the City of Mason, Texas.

    • The City of Mason maintains a Building Permits / Inspection Department and identifies building permits and inspections as contactable functions.
    • The City's official ordinance listings include Ordinance 13-322, titled "Adoption of Various International Building Codes for Construction and Inspections," and Ordinance 10-312, titled "International Building Codes Relating to Construction and Inspections."
    • The specific code editions, applicability exceptions, permit thresholds, and fee amounts were not established from the opened official webpage text.

    adopted code instruments listed by city: Ordinance 13-322 and Ordinance 10-312

    “13-322 Adoption of Various International Building Codes for Construction and Inspections (PDF)”
    One more reviewed finding on this topic
    • Adopted (with conditions) — Building-code adoption and enforcement within the incorporated City of Mason, Texas.
      “13-322 Adoption of Various International Building Codes for Construction and Inspections (PDF)”
  • Local zoningPresent (with conditions)

    Property within the corporate limits of the City of Mason, Texas, which lies in Mason County.

    • The ordinance applies only to property within the City of Mason corporate limits; it does not establish a Mason County unincorporated-area zoning rule.
    • Land, buildings, structures, and appurtenances that are occupied, used, erected, or converted must conform to the regulations for the applicable zoning district, except as otherwise provided by the ordinance.
    • The ordinance establishes nine districts: R-1 Single Family Residential, R-2 Mixed Residential, MHP Manufactured Home Park, C-1 Light Commercial, C-2 Commercial, M-1 Light Manufacturing, M-2 Medium Manufacturing, PF Public Facilities, and OS Open Space.
    • The City ordinance index lists subsequent amendments to Ordinance 04-283, including Ordinance 23-351 and 2017 planned-area-development amendments.

    zoning districts: 9

    “constitute the zoning regulations of the City of Mason as adopted. [...] shall be applicable to all property within the corporate limits of Mason, Texas;”
    3 more reviewed findings on this topic
    • Present (with conditions) — Property within the corporate limits of the City of Mason, Texas.
      “The city of Mason, Texas, is hereby divided into nine (9) zoning districts.”
    • Present (with conditions) — Land, buildings, structures, and appurtenances within the incorporated City of Mason, Texas.
      “The city of Mason, Texas, is hereby divided into nine (9) zoning districts.”
    • Present (with conditions) — Zoning within the incorporated City of Mason, Texas.
      “The Planning & Zoning Commission recommends favorably or unfavorably for zoning districts, permitted uses in each zoning district; amendments to the zoning maps, the text of Ordinances and the Comprehensive Plan; historic districts and landmarks; and variances. It also conducts studies and makes recommendations on other matters relating to the planning and development of the City.”

Still unanswered

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

  • Inspections — Building inspections for construction in Mason County, including unincorporated areas
  • Certificate of occupancy — Certificates of occupancy or equivalent occupancy approvals for buildings in Mason County
  • Short-term rentals — Short-term rental use in Mason County, Texas.

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 Mason County, Texas

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

Mason County scores 66/100 on the Bolthole Index, a strong county profile. Its strengths: sparse surroundings — about 2,518 people within a 30-minute drive and low administrative friction for a quiet rural property. Watch-outs: elevated mid-century heat, water, rain, or wildfire exposure and workable self-sufficiency basics (28″/yr rainfall).

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

Mason 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 Mason County OSSF Designated Officer (Sanitation/Floodplain). 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 Mason County?

Living in an RV on your own land in Mason County is allowed: Unincorporated Mason County: no county rule sets this, because Mason 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 co.mason.tx.us. Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits. Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Mason County, Texas?

Land in Mason County runs about $2,655 per acre, based on the latest county data.

What is the water situation in Mason County?

Mason County gets about 28" of rain a year, with severe drought in roughly 31.4% of years.

How remote is Mason County?

A representative private-land location has about 2,518 people within a 30-minute drive and 655,640 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.

How Mason compares in Texas

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