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Navasota, Texas
Inside Navasota's city limits, shrink-swell clay limits houses without basements on 80% of mapped land, the 3rd-highest of 6 cities in Grimes County. A shallow water table limits basements on 8%, the 4th-highest of 6 cities in Grimes County.
That clay share is above Grimes County's 61%. FEMA's flood data list 30 flood losses since 2016 in ZIP code 77868 overlapping the city. Of its 2,967 homes, 36% were built before 1980; the median dates from 1985.
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
of homes built before 1980
Foundation repair in Navasota
Foundation repair in Navasota: shrink-swell clay limits slab homes on 80% of Navasota's mapped land, more than in 85% of Texas cities.
About 2,000 of Navasota's 2,967 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 Navasota city limits
| Expansive clay (limits slab homes) | 79.8% |
| High water table (limits basements) | 7.9% |
| Septic fields very limited | 91.3% |
| Clay swell (LEP, by area) | 8.2% |
| High-swell land (LEP 6%+) | 81.7% |
| Mapped soil | 5,453 acres |
What the numbers mean here
Clay swell averages a linear extensibility of 8.2% by land area here, and 82% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 80% of the mapped land.
Clay shrinks as it dries: 78.3% of Grimes County is in drought on the latest map, and 80% of Navasota's mapped land has shrink-swell clay.
USDA rates 91% 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 Navasota. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 77868 | 100% | 30 | $448,423 |
Homes in Navasota
| Housing units | 2,967 |
| Median year built | 1985 |
| Built before 1980 | 36% |
| Built 2000 or later | 24% |
| Owner-occupied | 60% |
| Median value, owner-occupied | $208,100 |
| Single-family detached | 67% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Anderson | 9 mi | 70% | 3% |
| Plantersville | 14 mi | 19% | 77% |
| Todd Mission | 18 mi | 0% | 94% |
| College Station | 18 mi | 57% | 23% |
| Hempstead | 20 mi | 49% | 39% |
| Prairie View | 22 mi | 2% | 47% |
| Pine Island | 23 mi | 13% | 30% |
| Montgomery | 23 mi | 81% | 27% |
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