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St. Hedwig, Texas
Inside St. Hedwig's city limits, shrink-swell clay limits houses without basements on 54% of mapped land, higher than 61% of Texas cities. A shallow water table limits basements on under 1%.
That clay share is close to Bexar County's 51%. FEMA's flood data list 1 flood losses since 2016 in the 2 ZIP codes overlapping the city. Of its 791 homes, 13% were built before 1980; the median dates from 1997.
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 2 overlapping ZIPs
of homes built before 1980
Foundation repair in St. Hedwig
Foundation repair in St. Hedwig: shrink-swell clay limits slab homes on 54% of St. Hedwig's mapped land, more than in 61% of Texas cities.
About 600 of St. Hedwig's 791 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 St. Hedwig city limits
| Expansive clay (limits slab homes) | 53.8% |
| High water table (limits basements) | 0.1% |
| Septic fields very limited | 95.5% |
| Clay swell (LEP, by area) | 6.7% |
| High-swell land (LEP 6%+) | 38.2% |
| Mapped soil | 19,144 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Wilco | 22% | n/a |
| Miguel | 16% | n/a |
| San Antonio | 14% | n/a |
| Floresville | 14% | n/a |
| Houston Black | 7% | 91% |
| Tinn | 5% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 6.7% by land area here, and 38% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 54% of the mapped land.
Clay shrinks as it dries: 79.6% of Bexar County is in drought on the latest map, and 54% of St. Hedwig's mapped land has shrink-swell clay.
USDA rates 95% of the land very limited for septic absorption fields.
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 St. Hedwig. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 78152 | 90% | 1 | $9,826 |
| 78101 | 10% | 0 | $0 |
Homes in St. Hedwig
| Housing units | 791 |
| Median year built | 1997 |
| Built before 1980 | 13% |
| Built 2000 or later | 45% |
| Owner-occupied | 98% |
| Median value, owner-occupied | $282,100 |
| Single-family detached | 76% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| La Vernia | 7 mi | 7% | 0% |
| New Berlin | 8 mi | 69% | 1% |
| China Grove | 9 mi | 60% | 0% |
| Converse | 9 mi | 85% | 0% |
| Cibolo | 10 mi | 78% | under 1% |
| Schertz | 10 mi | 63% | under 1% |
| Universal City | 11 mi | 63% | 0% |
| Kirby | 11 mi | 86% | 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