Buying land in Dallam County, Texas: what to check
Dallam County covers 1,503 square miles of land and 2 of water in Texas, with about 7,526 residents in 2024 (up 5.5% since 2020). The 2020 Census counted 100% of its land as rural and 77% of residents as living in urban areas. Farms operate 100% of the county's land. Below: how much of Dallam County floods, what its soils allow, what farmland is worth and how often it's in drought, from free public data with every source linked.
Dallam County at a glance
Hydric (wetland-type) soils
under 1%
About the state's county median (under 1%)
Farm land value, 2022
$1,909/acre
Below the state's county median ($2,782)
What to check before buying land in Dallam County
Ordered by what Dallam County's numbers point to. Every parcel differs, so treat this as where to look first.
1.Prove the water supply before you buy
At least half of Dallam County was in severe drought (D2) or worse in 39% of the 262 weekly U.S. Drought Monitor maps from 2021 to 2026. Texas allocates water by permit or water right, so a well or pond isn't automatic.
Ask whether the land has a public water connection, an existing well (and its log and yield), or neighbors' well depths from the state well database. For a new well, check permits and typical depth with the state agency first.
2.Confirm legal road access and power
The 2020 Census classified 100% of Dallam County's land area as rural.
Rural tracts are often sold without recorded access or a power line nearby. Get the title company to confirm a recorded easement or public road frontage, and ask the electric co-op what a line extension costs.
3.Check the soils if you plan to farm, graze or garden
Farm real estate in Dallam County averaged $1,909 an acre including buildings in the 2022 Census of Agriculture, and 45% of its mapped soils are prime or of statewide importance.
Compare the asking price with recent sales of similar tracts, not the county average, which mixes cropland, pasture, timber and homesites. If an ag tax valuation applies, ask what the rollback taxes would be if you change the use.
4.Get a perc test before you close
USDA rates 19% of Dallam County's mapped soils "very limited" for conventional septic absorption fields and 0% "not limited".
Without city sewer you need a septic permit from the county or state health department. Make the offer contingent on a passing soil or perc test; mound and aerobic systems can cost several times a conventional one.
5.Confirm the flood zone at your exact spot
under 1% of the county's area is in the 1%-annual-chance (100-year) floodplain FEMA's National Risk Index uses for inland flooding; 1.6% of its mapped soils flood occasionally or frequently.
Even where little of the county floods, creeks and low spots do. Check the FEMA zone at the building site and the driveway route.
6.Rule out wetlands on the part you'll use
About under 1% of Dallam County's mapped soils are hydric (formed under saturated conditions, a federal wetland indicator) and under 1% are poorly or very poorly drained (USDA SSURGO).
Open the National Wetlands Inventory mapper at the parcel. Filling or draining a wetland can need a Clean Water Act Section 404 permit, and wet ground limits septic fields and building pads.
Flood zones, wetlands and water in Dallam County
- Area in the 1%-annual-chance (100-year) floodplain
- under 1%, 31st lowest of 254 in Texas FEMA National Risk Index
- Mapped soils that flood occasionally or frequently
- 1.6% USDA NRCS Web Soil Survey (SSURGO)
- Hydric soils (a federal wetland indicator)
- under 1% USDA NRCS Web Soil Survey (SSURGO)
- Poorly or very poorly drained soils
- under 1% USDA NRCS Web Soil Survey (SSURGO)
- Surface water (lakes, rivers, reservoirs)
- 2 sq mi Census 2024 Gazetteer Files
- Drought on 2026-10-27
- 4.8% moderate or worse, 0% severe or worse U.S. Drought Monitor county statistics
The floodplain share is the area FEMA's National Risk Index counts as exposed to inland flooding, mostly mapped 100-year flood zones. It says how common flood-prone land is in Dallam County, not whether a given parcel floods. For that, look up the zone at your exact point on the FEMA Flood Map Service Center or run the free check.
Soils and terrain
- Prime farmland
- 18% USDA NRCS Web Soil Survey (SSURGO)
- Prime only if drained, irrigated or protected
- 2.2% USDA NRCS Web Soil Survey (SSURGO)
- Farmland of statewide importance
- 27% USDA NRCS Web Soil Survey (SSURGO)
- Average slope over 15%
- 0% USDA NRCS Web Soil Survey (SSURGO)
- Very limited for septic absorption fields
- 19% USDA NRCS Web Soil Survey (SSURGO)
- Not limited for septic absorption fields
- 0% USDA NRCS Web Soil Survey (SSURGO)
Shares of Dallam County's soil-surveyed land (about 963,230 acres, open water excluded), using each map unit's dominant condition in USDA's SSURGO soil survey. Soils change within a few hundred feet, so the soil at your building site is what matters.
Farms and land use
- Farms (2022)
- 323 USDA NASS, 2022 Census of Agriculture
- Share of the county's land in farms
- 100% USDA NASS, 2022 Census of Agriculture
- Average farm size
- 2,975 acres (median 801) USDA NASS, 2022 Census of Agriculture
- Average value of land and buildings
- $1,909 per acre, 86th lowest of 254 in Texas USDA NASS, 2022 Census of Agriculture
- Cropland
- 411,259 acres USDA NASS, 2022 Census of Agriculture
- Pasture and rangeland
- 529,261 acres USDA NASS, 2022 Census of Agriculture
- Woodland on farms
- 1,347 acres USDA NASS, 2022 Census of Agriculture
- Irrigated land
- 189,730 acres USDA NASS, 2022 Census of Agriculture
Natural hazard ratings
FEMA's National Risk Index rates each hazard for Dallam County relative to every other U.S. county. Overall risk: Relatively Low.
- DroughtRelatively High
- LightningRelatively Moderate
- Winter weatherRelatively Moderate
- HailRelatively Low
- Strong windRelatively Low
- TornadoRelatively Low
- WildfireRelatively Low
- EarthquakeVery Low
- Heat waveVery Low
- River and inland floodingVery Low
- LandslideVery Low
FEMA National Risk Index, December 2025
Questions about buying land in Dallam County
How much of Dallam County, TX is in a flood zone?
About under 1% of Dallam County's area is in the 1%-annual-chance (100-year) floodplain used by FEMA's National Risk Index (December 2025), 31st lowest of 254 counties in Texas. Whether a given parcel is in a flood zone depends on its exact location, so check the FEMA map at your pin.
How much does land cost per acre in Dallam County?
The 2022 Census of Agriculture put the average value of farm land and buildings in Dallam County at $1,909 an acre, 86th lowest of 254 counties in Texas (the median Texas county was $2,782). It's a self-reported average across farms, so small homesites and recreational tracts often sell for more per acre.
Will a septic system work on land in Dallam County?
Often, but test first. USDA soil surveys rate 19% of Dallam County's mapped soils very limited for conventional septic absorption fields, usually because of wetness, slow permeability, shallow rock or flooding. A perc or soil test on the parcel decides what system the health department will permit.
Is there good farmland in Dallam County?
18% of Dallam County's mapped soils are prime farmland, 2.2% are prime only if drained, irrigated or protected from flooding, and 27% are farmland of statewide importance (USDA SSURGO). The 2022 Census of Agriculture counted 323 farms averaging 2,975 acres.
How often is Dallam County in drought?
Since 2021, at least half of the county was in severe drought or worse in 39% of weekly U.S. Drought Monitor maps, and in extreme drought in 28%. On 2026-10-27, 4.8% of the county was in moderate drought or worse.
Can I check a specific property in Dallam County?
Yes. Enter the address or drop a pin anywhere in Dallam County on the free check. It shows which checks return data at that exact point, and the full report costs $29: flood zone, slope, soils, wetlands, roads, power lines, wildfire and more, each with its source. It is a screen of public maps, not a survey, title search or perc test.
Check the parcel, not just the county
County numbers tell you what to look for. The free check looks at your exact point in Dallam County: flood zone, slope, soils, wetlands, roads, power and more. The full report is $29.
What these numbers can't tell you
- County shares describe Dallam County as a whole; a parcel can be entirely in or out of a flood zone, wetland or poor soil.
- It doesn't look at the whole parcel, its boundaries, title, easements, zoning or permits.
- It isn't a survey, appraisal, elevation certificate, soil or perc test, or Phase I environmental site assessment.
- It can't see local distribution power lines, driveways, legal access, wells or mineral rights.
- Maps lag behind the ground, and distances are straight-line, not driving distance.
Sources and vintages
- U.S. Census Bureau, 2024 Gazetteer Files: 2024 files
- U.S. Census Bureau, Vintage 2024 county population estimates: Vintage 2024 (July 1, 2024)
- U.S. Census Bureau, 2020 Census urban and rural classification: 2020 Census
- U.S. Census Bureau, 2024 county adjacency file: 2024
- FEMA National Risk Index: December 2025 release
- USDA NRCS Web Soil Survey (SSURGO): Soil Data Access, queried 2026-10-31
- USDA NASS, 2022 Census of Agriculture: 2022 Census of Agriculture (published 2024)
- U.S. Drought Monitor county statistics: weekly maps 2021-10-26 to 2026-10-27
- FEMA Flood Map Service Center: look up your own pin
- USFWS National Wetlands Inventory mapper: look up your own pin
Summarized per county by our build script on 2026-10-31. County figures cover the whole county; checks on the report are at your point.