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Round Top, Texas
Inside Round Top's city limits, shrink-swell clay limits houses without basements on 24% of mapped land. A shallow water table limits basements on 7%, the 3rd-highest of 7 cities in Fayette County.
That clay share is below Fayette County's 67%. FEMA's flood data list no flood losses since 2016 in ZIP code 78954 overlapping the city.
Data as of October 13, 2026 · sources · in Fayette County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 1 overlapping ZIP
Foundation repair in Round Top
Foundation repair in Round Top: shrink-swell clay limits slab homes on 24% of Round Top's mapped land.
| 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 Round Top city limits
| Expansive clay (limits slab homes) | 23.6% |
| High water table (limits basements) | 7.2% |
| Septic fields very limited | 85.4% |
| Clay swell (LEP, by area) | 3.9% |
| High-swell land (LEP 6%+) | 23.7% |
| Mapped soil | 608 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Carbengle | 31% | n/a |
| Knolle | 14% | n/a |
| Flatonia | 13% | n/a |
| Renish | 10% | n/a |
| Brenham | 7% | n/a |
| Frelsburg | 6% | 93% |
What the numbers mean here
Clay swell averages a linear extensibility of 3.9% by land area here, and 24% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 24% of the mapped land.
Clay shrinks as it dries: 100% of Fayette County is in drought on the latest map, and 24% of Round Top's mapped land has shrink-swell clay.
USDA rates 85% of the land very limited for septic absorption fields.
Drought in Fayette County
100% of Fayette 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 Round Top. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 78954 | 100% | 0 | $0 |
Homes
Round Top has fewer than 100 housing units in the ACS 2020-2024 estimates, too few for reliable shares.
Nearby cities
Sources: USDA SSURGO (August 5, 2026) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026). Methods · Data status