Wylie, Texas
Inside Wylie's city limits, shrink-swell clay limits houses without basements on 56% of mapped land, higher than 62% of Texas cities. A shallow water table limits basements on 1%, the 2nd-highest of 23 cities in Collin County.
That clay share is below Collin County's 72%. FEMA's flood data list 5 flood losses since 2016 in ZIP code 75098 overlapping the city. Of its 19,511 homes, 7% were built before 1980; the median dates from 2006.
Data as of October 13, 2026 · sources · in Collin 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 Wylie
Foundation repair in Wylie: shrink-swell clay limits slab homes on 56% of Wylie's mapped land, more than in 62% of Texas cities.
The city requires a permit for the work.
About 16,100 of Wylie's 19,511 homes are detached houses.
| City permit | Required. Wylie lists foundation repair among the types of construction work that require building permits. (City of Wylie, Texas, read October 2, 2026) |
| 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 Wylie city limits
| Expansive clay (limits slab homes) | 55.8% |
| High water table (limits basements) | 1.5% |
| Septic fields very limited | 57.9% |
| Clay swell (LEP, by area) | 10.6% |
| High-swell land (LEP 6%+) | 55.8% |
| Mapped soil | 19,878 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Houston Black | 22% | 91% |
| Burleson | 12% | 84% |
| Heiden | 10% | 80% |
| Wilson | 6% | 88% |
| Tinn | 5% | n/a |
| Altoga | 3% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 10.6% by land area here, and 56% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 56% of the mapped land.
Clay shrinks as it dries: 100% of Collin County is in drought on the latest map, and 56% of Wylie's mapped land has shrink-swell clay.
USDA rates 58% of the land very limited for septic absorption fields.
Drought in Collin County
100% of Collin 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 Wylie. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75098 | 85% | 5 | $36,381 |
Homes in Wylie
| Housing units | 19,511 |
| Median year built | 2006 |
| Built before 1980 | 7% |
| Built 2000 or later | 75% |
| Owner-occupied | 77% |
| Median value, owner-occupied | $387,000 |
| Single-family detached | 83% |
Nearby cities
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