USDA SSURGO Soil Survey
Soil Risk Assessment for 75048 (Dallas, TX)
30 distinct soil map units cover ZIP 75048, area-weighted from USDA's official soil survey — not a citywide estimate.
Get Foundation QuotesVery High
Dominant shrink-swell class
Houston Black clay, 1 to 3 percent slopes
21%
Of rated area is High/Very High shrink-swell
30
Distinct soil map units
What this means if you own property in 75048: "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. About 21% of this ZIP's rated area falls in the High or Very High shrink-swell range — real risk, but not the dominant soil type here. Exact conditions still vary block to block, which is the whole reason this isn't shown as one citywide number.
Likely repair approach for this soil profile
Spot pier repairs in the affected areas, evaluated case by case
A real but partial share of this ZIP's soil is expansive clay — often concentrated near specific drainage patterns or lot grading rather than uniform across the ZIP. That usually means full perimeter underpinning isn't automatic; a foundation specialist typically pier-repairs the specific areas showing movement rather than treating the whole structure as high-risk by default.
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
10.2% of this ZIP
USDA soil unit: Houston Black clay, 1 to 3 percent slopes
5.4% of this ZIP
USDA soil unit: Houston Black-Urban land complex, 0 to 4 percent slopes
2.5% of this ZIP
USDA soil unit: Frio silty clay, 0 to 1 percent slopes, occasionally flooded
1.3% of this ZIP
USDA soil unit: Heiden clay, 3 to 5 percent slopes, eroded
0.7% of this ZIP
USDA soil unit: Wilson clay loam, 1 to 3 percent slopes
0.7% of this ZIP
USDA soil unit: Ferris-Heiden complex, 5 to 12 percent slopes
0.6% of this ZIP
USDA soil unit: Water
0.6% of this ZIP
USDA soil unit: Branyon clay, 0 to 1 percent slopes
0.5% of this ZIP
USDA soil unit: Trinity clay, 0 to 1 percent slopes, frequently flooded
0.4% of this ZIP
USDA soil unit: Lewisville silty clay, 3 to 5 percent slopes, eroded
0.4% of this ZIP
USDA soil unit: Houston Black clay, 1 to 3 percent slopes
0.3% of this ZIP
USDA soil unit: Houston Black clay, 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.
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