Troup, Texas
Inside Troup's city limits, shrink-swell clay limits houses without basements on 2% of mapped land, the 3rd-highest of 10 cities in Smith County. A shallow water table limits basements on 56%, the highest of 10 cities in Smith County.
That clay share is close to Smith County's 3%. FEMA's flood data list 3 flood losses since 2016 in ZIP code 75789 overlapping the city. Of its 914 homes, 60% were built before 1980; the median dates from 1971.
Data as of October 13, 2026 · sources · in Smith 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 Troup
Foundation repair in Troup: shrink-swell clay limits slab homes on 2% of Troup's mapped land.
About 600 of Troup's 914 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 Troup city limits
| Expansive clay (limits slab homes) | 1.8% |
| High water table (limits basements) | 55.8% |
| Septic fields very limited | 87.6% |
| Clay swell (LEP, by area) | 2.7% |
| High-swell land (LEP 6%+) | 0.2% |
| Mapped soil | 1,577 acres |
What the numbers mean here
On 56% of Troup's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 88% of the land very limited for septic absorption fields.
Drought in Smith County
100% of Smith 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 Troup. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75789 | 100% | 3 | $50,380 |
Homes in Troup
| Housing units | 914 |
| Median year built | 1971 |
| Built before 1980 | 60% |
| Built 2000 or later | 25% |
| Owner-occupied | 64% |
| Median value, owner-occupied | $159,400 |
| Single-family detached | 68% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Arp | 7 mi | under 1% | 17% |
| Whitehouse | 8 mi | 5% | 24% |
| New Chapel Hill | 11 mi | 0% | 20% |
| Bullard | 11 mi | 1% | 19% |
| New Summerfield | 11 mi | 10% | 25% |
| Overton | 13 mi | under 1% | 9% |
| New London | 14 mi | 4% | 7% |
| Jacksonville | 15 mi | under 1% | 20% |
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