Unincorporated Dawson County, Texas does not require a building permit for a home, because the county's official site lists no building or permitting department1. There is no county zoning ordinance, so the county sets no rule on setbacks, minimum home size, or RV and tiny-home living, though the City of Lamesa zones inside its limits234. Septic permits for the whole county, Lamesa included, go through the South Plains Public Health District's Lamesa Clinic56.
At a glance
- Building permit
- Not required in unincorporated Dawson County1
- Zoning
- No county zoning ordinance; the City of Lamesa zones inside city limits24
- Septic permit
- Required; apply through the South Plains Public Health District57
- RV / tiny home living
- Unrestricted by county zoning (no zoning authority)3
- Owner-builder exemption
- You can install your own OSSF if the permitting authority allows it8
- 10-acre septic exemption
- Available for a single-family dwelling meeting all TCEQ conditions7
- Driveway onto a state highway
- Requires TxDOT Form 1058, max 24 ft wide9
- Water well
- New wells must be registered with the Mesa Underground Water Conservation District before drilling10
Who to call
Septic permits
South Plains Public Health District – Lamesa Clinic (Environmental Services)
Environmental health services for Dawson County: the septic (OSSF) application is returned to this district for authorization, and it inspects permitted OSSFs, investigates septic complaints and enforces OSSF rules
503 S. 1st Street, Lamesa, TX 79331
Also useful
Dawson County Courthouse (Commissioners Court / County Judge)
County governance; the office to confirm floodplain administration, subdivision platting, and whether any building or fire code has been adopted
400 S 1st Street, Lamesa, Texas 79331 (mailing: P.O. Box 1268, Lamesa, Texas 79331-1268)
Contact details are copied from each office’s official page and were checked against it on October 10, 2026.
Off-grid gear
Going off-grid in Dawson County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.
Do you need a building permit in Dawson County, Texas?
Dawson County's official website lists only elected offices and courthouse departments, no building or permitting department, and Texas counties generally cannot require structural building permits in unincorporated areas1. Texas law lets a county adopt residential building standards only by resolution or order, and no source we found shows whether Dawson County has done so11. If you plan to build, ask the Dawson County Commissioners Court to be sure12. Inside the City of Lamesa, the city council has zoning power under its charter, so ask the city about building and zoning rules there4. Septic permits stay with the district either way5.
Who handles septic and other permits in Dawson County, and how do you reach them?
There is no building department to call in Dawson County; the county's own site lists only elected offices like the County Judge, Commissioners Court, County Clerk and Sheriff1. Septic permits go through the South Plains Public Health District's Lamesa Clinic at 806-872-5863: its application lists Dawson County and tells applicants to return it to the district and receive authorization before construction56. TCEQ's records also list Dawson County as the authorized agent for the county, so ask the clinic to confirm who signs the permit13. For floodplain questions and any building or fire code the county may have adopted, the Dawson County Courthouse at (806)-329-3313 is where to start12.
Does Dawson County have zoning?
Unincorporated Dawson County has no zoning ordinance2. Texas law lets counties zone only in a few narrowly defined situations, and Dawson County is not among them14. The county therefore sets no minimum home size, no setbacks, no lot-coverage limit and no zoning districts, and it does not restrict accessory dwellings, RVs, tiny homes, manufactured homes or temporary camping on unincorporated land3. The City of Lamesa is the exception: its charter gives the city council full power to zone the city, so rules inside city limits are Lamesa's, not the county's4. County zoning does not remove the septic permit or the state-highway driveway permit, which still apply59.
How do septic permits work in Dawson County?
Every on-site sewage facility (OSSF) in Texas needs a permit before it is built, altered, extended or repaired15. In Dawson County the South Plains Public Health District's application is returned to the district for authorization before construction, and the owner authorizes district representatives to enter for lot evaluation and inspection516. The Lamesa Clinic also investigates septic complaints and enforces OSSF rules up to and including prosecution17. About 84.2% of Dawson County's soils are free of severe limitations for a conventional drain field, so a standard system is realistic on many parcels, though a site evaluation still applies18. A 10-acre exemption from permitting exists only if a licensed site evaluator confirms the tract, effluent and setbacks all meet TCEQ's conditions, including keeping the OSSF at least 100 feet from every property line and limiting the tract to one single-family dwelling15.
Can you live in an RV or tiny home on your land in Dawson County?
Dawson County's lack of zoning authority means the county itself does not restrict RV, manufactured-home or tiny-home occupancy on unincorporated land3. That does not exempt you from Texas's septic rules: any wastewater from an RV, tiny home or off-grid dwelling still needs a permitted OSSF or holding tank, and holding tanks and other off-grid sanitation remain subject to the same statewide OSSF permitting and construction standards19. Confirm with the South Plains Public Health District's Lamesa Clinic how your setup will be permitted before you move a camper or tiny home onto raw land6. Inside the City of Lamesa, city zoning applies instead of the county's no-zoning answer4.
Building a home in Dawson County: the steps, in order
- Confirm your parcel is in unincorporated Dawson County rather than inside Lamesa or another city, since the City of Lamesa zones and sets its own rules inside city limits4.
- Know that no county building permit is required for the residence itself in unincorporated Dawson County1.
- Contact the South Plains Public Health District's Lamesa Clinic for the septic application before you finalize a house site, since your septic layout will constrain where the house and driveway can sit56.
- If you are installing your own OSSF as the owner, confirm the permitting authority allows owner installation, since Texas only permits this if the local program allows it and you meet the ownership and no-sale conditions20.
- If your driveway will connect to a state highway, contact the local TxDOT district office and file Form 1058 before building it; the driveway cannot exceed 24 feet wide except for permitted radii9.
- Check with the Dawson County Courthouse on floodplain rules and any adopted fire or building code before you start construction12.
- If you plan a water well, register it with the Mesa Underground Water Conservation District before drilling10.
What to check before you buy land in Dawson County
Septic siting is promising: about 84.2% of Dawson County's soils are free of severe limitations for a conventional drain field, and about 98.2% of the county's land sits at 15% slope or less, so buildable, septic-friendly ground is common1821. Water is the bigger question: the county has seen severe drought in about 35.6% of recent years, so plan carefully for a well or rural water supply; new wells must be registered with the Mesa Underground Water Conservation District before drilling2210. Farmland here has recently averaged about $1,359 an acre and a typical home is valued around $111,7242324. Property taxes run about 1.7% of value, with a median bill near $1,5672526. Floodplain rules and any subdivision or platting requirements for unincorporated Dawson County were not confirmed on the county's official site, so ask the Dawson County Courthouse directly if your parcel is near a floodplain or you plan to split a tract12.
Watch-outs
- Whether Dawson County has adopted a residential building-code resolution under state law is unconfirmed; call the Commissioners Court before you assume no inspection will ever apply1112.
- Floodplain development rules for unincorporated Dawson County were not confirmable on the county's official site; ask the Dawson County Courthouse directly if your parcel is near a floodplain12.
- Texas's authorized-agent records list Dawson County as the OSSF agent while the district's application says to return it to the South Plains Public Health District; confirm with the Lamesa Clinic who signs the permit before you apply135.
- Inside the City of Lamesa, city zoning applies; the county's no-zoning answer covers unincorporated land only4.
Sources
- Dawson County TX - Official Website (2026 county census)
- Dawson County TX - Official Website (2026 county census)
- Texas law on county zoning and building authority
- Home Rule Charter, City of Lamesa, quoted and re-checked
- On-Site Sewage Facility Application and Authorization to Construct, quoted and re-checked
- South Plains Public Health District – Lamesa Clinic (Environmental Services) (southplainshealth.org)
- Getting a Permit for an OSSF - Such as a Septic System, quoted and re-checked
- Getting a Permit for an OSSF - Such as a Septic System (2026 county census)
- General Access Driveway Policy, quoted and re-checked
- Water Well Permits, quoted and re-checked
- Texas Local Government Code, Chapter 233, quoted and re-checked
- Dawson County Courthouse (Commissioners Court / County Judge) (co.dawson.tx.us)
- TCEQ OSSF Authorized Agent search (OARS) (2026 county census)
- Local Government Code Chapter 231, County Zoning Authority (Texas statewide rule), quoted and re-checked
- Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
- On-Site Sewage Facility Application and Authorization to Construct, quoted and re-checked
- southplainshealth.org, quoted and re-checked
- 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
- Getting a Permit for an OSSF - Such as a Septic System, quoted and re-checked
- Getting a Permit for an OSSF - Such as a Septic System, quoted and re-checked
- Share of land at 15% slope or less: Bolthole Index county data
- Share of years in severe drought: Bolthole Index county data
- Farmland value per acre (USDA census): Bolthole Index county data
- Typical home value (Zillow): Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- 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.