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Blanco, Texas
Inside Blanco's city limits, shrink-swell clay limits houses without basements on 28% of mapped land, the 3rd-highest of 3 cities in Blanco County. A shallow water table limits basements on 0%.
That clay share is close to Blanco County's 28%. FEMA's flood data list no flood losses since 2016 in ZIP code 78606 overlapping the city. Of its 989 homes, 47% were built before 1980; the median dates from 1982.
Data as of October 13, 2026 · sources · in Blanco 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 Blanco
Foundation repair in Blanco: shrink-swell clay limits slab homes on 28% of Blanco's mapped land.
About 700 of Blanco's 989 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 Blanco city limits
| Expansive clay (limits slab homes) | 27.5% |
| High water table (limits basements) | 0.0% |
| Septic fields very limited | 83.7% |
| Clay swell (LEP, by area) | 6.4% |
| High-swell land (LEP 6%+) | 27.5% |
| Mapped soil | 2,263 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Brackett | 21% | 0% |
| Lewisville | 16% | n/a |
| Doss | 15% | n/a |
| Krum | 13% | n/a |
| Tarpley | 10% | n/a |
| Bolar | 6% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 6.4% by land area here, and 28% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 28% of the mapped land.
Clay shrinks as it dries: 19.9% of Blanco County is in drought on the latest map, and 28% of Blanco's mapped land has shrink-swell clay.
USDA rates 84% of the land very limited for septic absorption fields.
Drought in Blanco County
19.9% of Blanco 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 Blanco. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 78606 | 100% | 0 | $0 |
Homes in Blanco
| Housing units | 989 |
| Median year built | 1982 |
| Built before 1980 | 47% |
| Built 2000 or later | 27% |
| Owner-occupied | 46% |
| Median value, owner-occupied | $265,500 |
| Single-family detached | 66% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Johnson City | 12 mi | 51% | 0% |
| Spring Branch | 15 mi | 18% | 0% |
| Woodcreek | 19 mi | 32% | 0% |
| Dripping Springs | 20 mi | 12% | 0% |
| Round Mountain | 21 mi | 31% | 0% |
| Wimberley | 21 mi | 18% | 0% |
| Bulverde | 22 mi | 13% | 0% |
| Fair Oaks Ranch | 28 mi | 46% | 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