Lavon, Texas
Inside Lavon's city limits, shrink-swell clay limits houses without basements on 80% of mapped land, higher than 85% of Texas cities. A shallow water table limits basements on under 1%.
That clay share is above Collin County's 72%. FEMA's flood data list 1 flood losses since 2016 in ZIP code 75166 overlapping the city. Of its 2,144 homes, 1% were built before 1980; the median dates from 2009.
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 Lavon
Foundation repair in Lavon: shrink-swell clay limits slab homes on 80% of Lavon's mapped land, more than in 85% of Texas cities.
About 2,000 of Lavon's 2,144 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 Lavon city limits
| Expansive clay (limits slab homes) | 80.1% |
| High water table (limits basements) | 0.2% |
| Septic fields very limited | 81.7% |
| Clay swell (LEP, by area) | 11.7% |
| High-swell land (LEP 6%+) | 80.1% |
| Mapped soil | 2,753 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Houston Black | 63% | 91% |
| Heiden | 17% | 80% |
| Lewisville | 5% | n/a |
| Tinn | 3% | n/a |
| Engle | 3% | n/a |
| Altoga | 3% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 11.7% by land area here, and 80% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 80% of the mapped land.
Clay shrinks as it dries: 100% of Collin County is in drought on the latest map, and 80% of Lavon's mapped land has shrink-swell clay.
USDA rates 82% 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 Lavon. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75166 | 100% | 1 | $32,514 |
Homes in Lavon
| Housing units | 2,144 |
| Median year built | 2009 |
| Built before 1980 | 1% |
| Built 2000 or later | 92% |
| Owner-occupied | 90% |
| Median value, owner-occupied | $394,300 |
| Single-family detached | 95% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Nevada | 4 mi | 82% | 0% |
| Wylie | 5 mi | 56% | 1% |
| Fate | 6 mi | 81% | under 1% |
| Mobile City | 7 mi | 82% | 0% |
| St. Paul | 7 mi | 84% | 0% |
| Josephine | 7 mi | 84% | under 1% |
| Rockwall | 7 mi | 83% | under 1% |
| Royse City | 8 mi | 87% | 4% |
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