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Lampasas, Texas
Inside Lampasas' city limits, shrink-swell clay limits houses without basements on 18% of mapped land, the 2nd-highest of 3 cities in Lampasas County. A shallow water table limits basements on 0%.
That clay share is close to Lampasas County's 20%. FEMA's flood data list 16 flood losses since 2016 in ZIP code 76550 overlapping the city. Of its 3,297 homes, 64% were built before 1980; the median dates from 1970.
Data as of October 13, 2026 · sources · in Lampasas 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 Lampasas
Foundation repair in Lampasas: shrink-swell clay limits slab homes on 18% of Lampasas' mapped land.
About 2,700 of Lampasas' 3,297 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 Lampasas city limits
| Expansive clay (limits slab homes) | 17.6% |
| High water table (limits basements) | 0.0% |
| Septic fields very limited | 67.8% |
| Clay swell (LEP, by area) | 4.1% |
| High-swell land (LEP 6%+) | 17.6% |
| Mapped soil | 4,736 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Brackett | 32% | 0% |
| Lampasas | 18% | n/a |
| Oakalla | 14% | n/a |
| Rumley | 10% | n/a |
| Krum | 8% | n/a |
| Real | 6% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 4.1% by land area here, and 18% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 18% of the mapped land.
Clay shrinks as it dries: 73.7% of Lampasas County is in drought on the latest map, and 18% of Lampasas' mapped land has shrink-swell clay.
USDA rates 68% of the land very limited for septic absorption fields.
Drought in Lampasas County
73.7% of Lampasas 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 Lampasas. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 76550 | 100% | 16 | $336,238 |
Homes in Lampasas
| Housing units | 3,297 |
| Median year built | 1970 |
| Built before 1980 | 64% |
| Built 2000 or later | 18% |
| Owner-occupied | 64% |
| Median value, owner-occupied | $198,800 |
| Single-family detached | 81% |
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