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Elmendorf, Texas
Inside Elmendorf's city limits, shrink-swell clay limits houses without basements on 11% of mapped land. A shallow water table limits basements on under 1%.
That clay share is below Bexar County's 51%. FEMA's flood data list no flood losses since 2016 in ZIP code 78112 overlapping the city. Of its 826 homes, 22% were built before 1980; the median dates from 1994.
Data as of October 13, 2026 · sources · in Bexar 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 Elmendorf
Foundation repair in Elmendorf: shrink-swell clay limits slab homes on 11% of Elmendorf's mapped land.
About 400 of Elmendorf's 826 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 Elmendorf city limits
| Expansive clay (limits slab homes) | 11.2% |
| High water table (limits basements) | 0.1% |
| Septic fields very limited | 91.9% |
| Clay swell (LEP, by area) | 3.5% |
| High-swell land (LEP 6%+) | 2.4% |
| Mapped soil | 3,949 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Wilco | 35% | n/a |
| Aluf | 27% | n/a |
| Miguel | 9% | n/a |
| Leming | 7% | n/a |
| Duval | 6% | n/a |
| Floresville | 5% | n/a |
What the numbers mean here
USDA rates 92% of the land very limited for septic absorption fields.
With shrink-swell clay on 11% and a shallow water table on under 1% of the land, the soil survey points to neither problem across most of Elmendorf; conditions still vary lot by lot.
Drought in Bexar County
79.6% of Bexar 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 Elmendorf. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 78112 | 96% | 0 | $0 |
Homes in Elmendorf
| Housing units | 826 |
| Median year built | 1994 |
| Built before 1980 | 22% |
| Built 2000 or later | 36% |
| Owner-occupied | 83% |
| Median value, owner-occupied | $161,300 |
| Single-family detached | 48% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Sandy Oaks | 8 mi | 0% | 0% |
| China Grove | 10 mi | 60% | 0% |
| Floresville | 12 mi | 16% | under 1% |
| St. Hedwig | 13 mi | 54% | under 1% |
| La Vernia | 13 mi | 7% | 0% |
| Kirby | 15 mi | 86% | 0% |
| Terrell Hills | 17 mi | 74% | 0% |
| Converse | 18 mi | 85% | 0% |
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