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Carthage, Texas
Inside Carthage's city limits, shrink-swell clay limits houses without basements on 73% of mapped land, the highest of 3 cities in Panola County. A shallow water table limits basements on 73%, the highest of 3 cities in Panola County.
That clay share is above Panola County's 50%. FEMA's flood data list no flood losses since 2016 in ZIP code 75633 overlapping the city. Of its 3,061 homes, 58% were built before 1980; the median dates from 1977.
Data as of October 13, 2026 · sources · in Panola 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 Carthage
Foundation repair in Carthage: shrink-swell clay limits slab homes on 73% of Carthage's mapped land, more than in 76% of Texas cities.
About 2,100 of Carthage's 3,061 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 Carthage city limits
| Expansive clay (limits slab homes) | 72.6% |
| High water table (limits basements) | 72.8% |
| Septic fields very limited | 97.8% |
| Clay swell (LEP, by area) | 6.3% |
| High-swell land (LEP 6%+) | 72.6% |
| Mapped soil | 7,015 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Scottsville | 45% | n/a |
| Eastwood | 27% | 99% |
| Latex | 17% | n/a |
| Marietta | 4% | n/a |
| Metcalf | 2% | n/a |
| Wrightsville | 2% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 6.3% by land area here, and 73% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 73% of the mapped land.
Clay shrinks as it dries: 100% of Panola County is in drought on the latest map, and 73% of Carthage's mapped land has shrink-swell clay.
On 73% of Carthage's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 98% of the land very limited for septic absorption fields.
Drought in Panola County
100% of Panola 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 Carthage. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75633 | 100% | 0 | $0 |
Homes in Carthage
| Housing units | 3,061 |
| Median year built | 1977 |
| Built before 1980 | 58% |
| Built 2000 or later | 25% |
| Owner-occupied | 64% |
| Median value, owner-occupied | $164,200 |
| Single-family detached | 69% |
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