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Highland Park, Texas
Inside Highland Park's city limits, shrink-swell clay limits houses without basements on 35% of mapped land. A shallow water table limits basements on under 1%.
That clay share is below Dallas County's 51%. USDA doesn't rate the 36% of mapped land classed as urban land, so these shares are floors. FEMA's flood data list 4 flood losses since 2016 in ZIP code 75205 overlapping the city. Of its 3,667 homes, 52% were built before 1980; the median dates from 1977.
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 1 overlapping ZIP
of homes built before 1980
Foundation repair in Highland Park
Foundation repair in Highland Park: shrink-swell clay limits slab homes on 35% of Highland Park's mapped land.
About 3,000 of Highland Park's 3,667 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 Highland Park city limits
| Expansive clay (limits slab homes) | 34.7% |
| High water table (limits basements) | 0.1% |
| Septic fields very limited | 78.0% |
| Clay swell (LEP, by area) | 9.9% |
| High-swell land (LEP 6%+) | 51.1% |
| Urban land, not rated | 36.0% |
| Mapped soil | 1,441 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Austin | 16% | 93% |
| Houston Black | 13% | 91% |
| Dalco | 10% | n/a |
| Lewisville | 9% | n/a |
| Frio | 2% | n/a |
| Axtell | 1% | 89% |
What the numbers mean here
Clay swell averages a linear extensibility of 9.9% by land area here, and 51% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 35% of the mapped land.
Clay shrinks as it dries: 100% of Dallas County is in drought on the latest map, and 35% of Highland Park's mapped land has shrink-swell clay.
USDA rates 78% 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 Highland Park. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75205 | 89% | 4 | $29,929 |
Homes in Highland Park
| Housing units | 3,667 |
| Median year built | 1977 |
| Built before 1980 | 52% |
| Built 2000 or later | 23% |
| Owner-occupied | 89% |
| Median value, owner-occupied | $2.0 million |
| Single-family detached | 81% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| University Park | 1 mi | 33% | 0% |
| Dallas | 3 mi | 37% | 5% |
| Farmers Branch | 8 mi | 45% | 3% |
| Cockrell Hill | 8 mi | 5% | under 1% |
| Addison | 9 mi | 28% | under 1% |
| Irving | 10 mi | 65% | 10% |
| Richardson | 11 mi | 52% | under 1% |
| Garland | 11 mi | 59% | 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