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Spring Branch, Texas
Inside Spring Branch's city limits, shrink-swell clay limits houses without basements on 18% of mapped land, the 4th-highest of 5 cities in Comal County. A shallow water table limits basements on 0%.
That clay share is close to Comal County's 19%. FEMA's flood data list 7 flood losses since 2016 in ZIP code 78070 overlapping the city. Of its 100 homes, 68% were built before 1980; the median dates from 1948.
Data as of October 13, 2026 · sources · in Comal 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 Spring Branch
Foundation repair in Spring Branch: shrink-swell clay limits slab homes on 18% of Spring Branch's mapped land.
About 100 of Spring Branch's 100 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 Spring Branch city limits
| Expansive clay (limits slab homes) | 17.7% |
| High water table (limits basements) | 0.0% |
| Septic fields very limited | 84.9% |
| Clay swell (LEP, by area) | 4.9% |
| High-swell land (LEP 6%+) | 17.7% |
| Mapped soil | 1,307 acres |
What the numbers mean here
Clay swell averages a linear extensibility of 4.9% 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: 82.6% of Comal County is in drought on the latest map, and 18% of Spring Branch's mapped land has shrink-swell clay.
USDA rates 85% of the land very limited for septic absorption fields.
Drought in Comal County
82.6% of Comal 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 Spring Branch. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 78070 | 100% | 7 | $50,704 |
Homes in Spring Branch
| Housing units | 100 |
| Median year built | 1948 |
| Built before 1980 | 68% |
| Built 2000 or later | 24% |
| Owner-occupied | 42% |
| Single-family detached | 78% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Bulverde | 7 mi | 13% | 0% |
| Blanco | 15 mi | 28% | 0% |
| Fair Oaks Ranch | 17 mi | 46% | under 1% |
| Garden Ridge | 18 mi | 21% | under 1% |
| Hollywood Park | 20 mi | 52% | 0% |
| Boerne | 20 mi | 43% | 0% |
| Wimberley | 20 mi | 18% | 0% |
| Woodcreek | 21 mi | 32% | 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