USDA SSURGO Soil Survey
Soil Risk Assessment for 75247 (Dallas, TX)
10 distinct soil map units cover ZIP 75247, area-weighted from USDA's official soil survey — not a citywide estimate.
Get Foundation QuotesVery High
Dominant shrink-swell class
Trinity-Urban land complex, 0 to 1 percent slopes, occasionally flooded
92%
Of rated area is High/Very High shrink-swell
10
Distinct soil map units
What this means if you own property in 75247: "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 — 92% — 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
66.3% of this ZIP
USDA soil unit: Trinity-Urban land complex, 0 to 1 percent slopes, occasionally flooded
24.7% of this ZIP
USDA soil unit: Trinity clay, 0 to 1 percent slopes, frequently flooded
1.3% of this ZIP
USDA soil unit: Arents loamy, gently undulating, frequently flooded
0.8% of this ZIP
USDA soil unit: Water
0.4% of this ZIP
USDA soil unit: Houston Black-Urban land complex, 0 to 4 percent slopes
0.2% of this ZIP
USDA soil unit: Urban land
0.2% of this ZIP
USDA soil unit: Silstid-Urban land complex, 0 to 6 percent slopes
0.2% of this ZIP
USDA soil unit: Ferris-Urban land complex, 5 to 12 percent slopes
0.1% of this ZIP
USDA soil unit: Silawa-Urban land complex, 2 to 6 percent slopes
0.0% of this ZIP
USDA soil unit: Frio-Urban land complex, 0 to 1 percent slopes, frequently flooded
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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