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Anderson, Texas
Inside Anderson's city limits, shrink-swell clay limits houses without basements on 70% of mapped land, the 4th-highest of 6 cities in Grimes County. A shallow water table limits basements on 3%.
That clay share is above Grimes County's 61%. FEMA's flood data list 1 flood losses since 2016 in ZIP code 77830 overlapping the city.
Data as of October 13, 2026 · sources · in Grimes County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 1 overlapping ZIP
Foundation repair in Anderson
Foundation repair in Anderson: shrink-swell clay limits slab homes on 70% of Anderson's mapped land, more than in 74% of Texas cities.
| 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 Anderson city limits
| Expansive clay (limits slab homes) | 69.7% |
| High water table (limits basements) | 2.6% |
| Septic fields very limited | 89.1% |
| Clay swell (LEP, by area) | 11.5% |
| High-swell land (LEP 6%+) | 69.7% |
| Mapped soil | 329 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Frelsburg | 35% | 93% |
| Latium | 21% | n/a |
| Carbengle | 13% | n/a |
| Chazos | 12% | n/a |
| Brenham | 7% | n/a |
| Klump | 4% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 11.5% by land area here, and 70% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 70% of the mapped land.
Clay shrinks as it dries: 78.3% of Grimes County is in drought on the latest map, and 70% of Anderson's mapped land has shrink-swell clay.
USDA rates 89% of the land very limited for septic absorption fields.
Drought in Grimes County
78.3% of Grimes 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 Anderson. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 77830 | 100% | 1 | $27,136 |
Homes
Anderson has fewer than 100 housing units in the ACS 2020-2024 estimates, too few for reliable shares.
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Navasota | 9 mi | 80% | 8% |
| Plantersville | 13 mi | 19% | 77% |
| Todd Mission | 18 mi | 0% | 94% |
| Montgomery | 19 mi | 81% | 27% |
| College Station | 19 mi | 57% | 23% |
| Iola | 20 mi | 94% | 3% |
| Bedias | 21 mi | 82% | 13% |
| Magnolia | 24 mi | 2% | 75% |
Sources: USDA SSURGO (August 5, 2026) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026). Methods · Data status