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Weir, Texas
Inside Weir's city limits, shrink-swell clay limits houses without basements on 57% of mapped land, higher than 63% of Texas cities. A shallow water table limits basements on under 1%.
That clay share is close to Williamson County's 60%. FEMA's flood data list 10 flood losses since 2016 in the 2 ZIP codes overlapping the city. Of its 154 homes, 27% were built before 1980; the median dates from 1995.
Data as of October 13, 2026 · sources · in Williamson County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 2 overlapping ZIPs
of homes built before 1980
Foundation repair in Weir
Foundation repair in Weir: shrink-swell clay limits slab homes on 57% of Weir's mapped land, more than in 63% of Texas cities.
About 100 of Weir's 154 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 Weir city limits
| Expansive clay (limits slab homes) | 56.8% |
| High water table (limits basements) | 0.1% |
| Septic fields very limited | 83.8% |
| Clay swell (LEP, by area) | 5.8% |
| High-swell land (LEP 6%+) | 21.5% |
| Mapped soil | 1,186 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Austin | 36% | 93% |
| Castephen | 17% | n/a |
| Houston Black | 14% | 91% |
| Krum | 10% | n/a |
| Oakalla | 4% | n/a |
| Altoga | 4% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 5.8% by land area here, and 22% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 57% of the mapped land.
Clay shrinks as it dries: 100% of Williamson County is in drought on the latest map, and 57% of Weir's mapped land has shrink-swell clay.
USDA rates 84% of the land very limited for septic absorption fields.
Drought in Williamson County
100% of Williamson 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 Weir. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 78626 | 78% | 10 | $399,137 |
| 78674 | 22% | 0 | $0 |
Homes in Weir
| Housing units | 154 |
| Median year built | 1995 |
| Built before 1980 | 27% |
| Built 2000 or later | 42% |
| Owner-occupied | 93% |
| Single-family detached | 55% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Georgetown | 6 mi | 42% | under 1% |
| Jarrell | 9 mi | 49% | 0% |
| Granger | 9 mi | 85% | under 1% |
| Hutto | 10 mi | 70% | under 1% |
| Round Rock | 11 mi | 56% | under 1% |
| Taylor | 12 mi | 81% | under 1% |
| Bartlett | 12 mi | 84% | 0% |
| Pflugerville | 16 mi | 66% | 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