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Wilmer, Texas
Inside Wilmer's city limits, shrink-swell clay limits houses without basements on 72% of mapped land, higher than 76% of Texas cities. A shallow water table limits basements on 2%.
That clay share is above Dallas County's 51%. FEMA's flood data list 14 flood losses since 2016 in the 2 ZIP codes overlapping the city. Of its 1,848 homes, 26% were built before 1980; the median dates from 2008.
Data as of October 13, 2026 · sources · in Dallas County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 2 overlapping ZIPs
of homes built before 1980
Foundation repair in Wilmer
Foundation repair in Wilmer: shrink-swell clay limits slab homes on 72% of Wilmer's mapped land, more than in 76% of Texas cities.
About 800 of Wilmer's 1,848 homes are detached houses.
| Who designs the repair | The ASCE Texas Section's repair guidelines say a Texas-licensed engineer should evaluate the foundation and design the repair (2022 guidelines) |
| Prices | Cost guide ranges compared |
Soil under Wilmer city limits
| Expansive clay (limits slab homes) | 72.1% |
| High water table (limits basements) | 1.8% |
| Septic fields very limited | 81.7% |
| Clay swell (LEP, by area) | 11.4% |
| High-swell land (LEP 6%+) | 69.7% |
| Urban land, not rated | 2.2% |
| Mapped soil | 7,868 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Houston Black | 29% | 91% |
| Branyon | 25% | 92% |
| Heiden | 9% | 80% |
| Lewisville | 5% | n/a |
| Trinity | 4% | n/a |
| Frio | 3% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 11.4% by land area here, and 70% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 72% of the mapped land.
Clay shrinks as it dries: 100% of Dallas County is in drought on the latest map, and 72% of Wilmer's mapped land has shrink-swell clay.
USDA rates 82% of the land very limited for septic absorption fields.
Drought in Dallas County
100% of Dallas County is in drought (D1 or worse) on the October 13, 2026 map. County detail.
Flood losses by ZIP code
FEMA flood records since 2016 in the ZIP codes that overlap Wilmer. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75172 | 82% | 0 | $0 |
| 75146 | 15% | 14 | $489,969 |
Homes in Wilmer
| Housing units | 1,848 |
| Median year built | 2008 |
| Built before 1980 | 26% |
| Built 2000 or later | 60% |
| Owner-occupied | 59% |
| Median value, owner-occupied | $157,200 |
| Single-family detached | 43% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Hutchins | 4 mi | 55% | 1% |
| Ferris | 4 mi | 81% | under 1% |
| Lancaster | 5 mi | 68% | under 1% |
| Red Oak | 9 mi | 81% | under 1% |
| Seagoville | 9 mi | 74% | 12% |
| Balch Springs | 9 mi | 45% | 34% |
| Combine | 10 mi | 51% | 15% |
| Pecan Hill | 10 mi | 78% | under 1% |
Sources: USDA SSURGO (August 5, 2026) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · Census ACS 2020-2024. Methods · Data status