USDA SSURGO Soil Survey
Soil Risk Assessment for 75234 (Dallas, TX)
30 distinct soil map units cover ZIP 75234, area-weighted from USDA's official soil survey — not a citywide estimate.
Get Foundation QuotesVery High
Dominant shrink-swell class
Houston Black-Urban land complex, 0 to 4 percent slopes
60%
Of rated area is High/Very High shrink-swell
30
Distinct soil map units
What this means if you own property in 75234: "Shrink-swell" describes soil that expands when wet and shrinks when it dries out — the actual mechanism behind cracked slabs, sticking doors, and uneven floors, not just a label. Over half of this ZIP's rated area — 60% — falls in the High or Very High shrink-swell range, meaning foundation movement here is driven by real soil chemistry, not poor original construction. That's worth knowing before assuming a crack means a builder made a mistake.
Likely repair approach for this soil profile
Deep foundation piers (steel push piers or helical piers)
With over half this ZIP's rated area in the High/Very High shrink-swell range, foundation movement here tends to be chronic, not a one-time settling event. Piers are driven past the “active zone” — the layer of clay that's actually expanding and contracting with moisture — down to more stable soil or bedrock, so the foundation's load transfers below the soil that's moving instead of resting on it. Mudjacking/slabjacking can relevel a slab short-term, but it doesn't reach the active zone, so movement here often returns.
This is general engineering guidance based on this ZIP's real soil composition above, not a record of repairs actually performed here — the right method for any specific property still depends on a site inspection, foundation type, and the actual damage observed.
Current drought conditions — U.S. Drought Monitor
No significant drought is affecting Dallas County right now. That's relevant too — the shrink-swell movement described above is driven by wet/dry cycling, and without an active drought, this ZIP's soil composition (not current weather) is what's actually driving any foundation risk here.
Source: U.S. Drought Monitor (USDA/NOAA/University of Nebraska-Lincoln), week of June 30, 2026. County-level reading, not ZIP-specific — local conditions can vary within a county.
Soil Composition
54.1% of this ZIP
USDA soil unit: Houston Black-Urban land complex, 0 to 4 percent slopes
3.8% of this ZIP
USDA soil unit: Wilson-Urban land complex, 0 to 2 percent slopes
2.3% of this ZIP
USDA soil unit: Trinity-Urban land complex, 0 to 1 percent slopes, occasionally flooded
1.9% of this ZIP
USDA soil unit: Lewisville-Urban land complex, 4 to 8 percent slopes
1.9% of this ZIP
USDA soil unit: Arents, loamy, hilly, rarely flooded
1.6% of this ZIP
USDA soil unit: Ferris-Urban land complex, 5 to 12 percent slopes
0.5% of this ZIP
USDA soil unit: Crockett fine sandy loam, 0 to 1 percent slopes
0.5% of this ZIP
USDA soil unit: Bastsil-Urban land complex, 0 to 2 percent slopes
0.5% of this ZIP
USDA soil unit: Bastsil fine sandy loam, 0 to 2 percent slopes
0.4% of this ZIP
USDA soil unit: Stephen-Urban land complex, 1 to 4 percent slopes
0.3% of this ZIP
USDA soil unit: Frio silty clay, 0 to 1 percent slopes, frequently flooded
0.2% of this ZIP
USDA soil unit: Wilson clay loam, 0 to 1 percent slopes
Source: USDA Natural Resources Conservation Service, SSURGO soil survey, area-weighted per ZIP via intersection with Census TIGER/Line ZCTA boundaries. Shrink-swell class is derived from each soil component's Linear Extensibility Percent (LEP), the standard USDA-NRCS expansive-soil indicator. This describes the ZIP overall — soil composition can still vary within a single property; a site-specific inspection is the only way to know conditions at a specific address.
Get Foundation Quotes
Takes about a minute. No cost, no obligation to hire anyone.
More for this area