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San Augustine, Texas
Inside San Augustine's city limits, shrink-swell clay limits houses without basements on 0% of mapped land. A shallow water table limits basements on 32%.
That clay share is below San Augustine County's 20%. FEMA's flood data list 5 flood losses since 2016 in ZIP code 75972 overlapping the city. Of its 1,204 homes, 48% were built before 1980; the median dates from 1982.
Data as of October 13, 2026 · sources · in San Augustine 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 San Augustine
Foundation repair in San Augustine: shrink-swell clay limits slab homes on 0% of San Augustine's mapped land.
About 700 of San Augustine's 1,204 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 San Augustine city limits
| Expansive clay (limits slab homes) | 0.0% |
| High water table (limits basements) | 31.7% |
| Septic fields very limited | 85.3% |
| Clay swell (LEP, by area) | 4.0% |
| High-swell land (LEP 6%+) | 0.1% |
| Mapped soil | 3,081 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Nacogdoches | 41% | 0% |
| Alto | 25% | n/a |
| Trawick | 13% | n/a |
| Hannahatchee | 4% | n/a |
| Tuscosso | 4% | n/a |
| Mattex | 4% | n/a |
What the numbers mean here
On 32% of San Augustine's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 85% of the land very limited for septic absorption fields.
Drought in San Augustine County
100% of San Augustine 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 San Augustine. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75972 | 100% | 5 | $31,883 |
Homes in San Augustine
| Housing units | 1,204 |
| Median year built | 1982 |
| Built before 1980 | 48% |
| Built 2000 or later | 19% |
| Owner-occupied | 57% |
| Median value, owner-occupied | $98,400 |
| Single-family detached | 61% |
Nearby cities
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