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Union Grove, Texas
Inside Union Grove's city limits, shrink-swell clay limits houses without basements on 1% of mapped land, the highest of 5 cities in Upshur County. A shallow water table limits basements on 31%, the 4th-highest of 5 cities in Upshur County.
That clay share is close to Upshur County's 2%. FEMA's flood data list 2 flood losses since 2016 in ZIP code 75647 overlapping the city. Of its 248 homes, 15% were built before 1980; the median dates from 2003.
Data as of October 13, 2026 · sources · in Upshur 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 Union Grove
Foundation repair in Union Grove: shrink-swell clay limits slab homes on 1% of Union Grove's mapped land.
About 200 of Union Grove's 248 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 Union Grove city limits
| Expansive clay (limits slab homes) | 1.2% |
| High water table (limits basements) | 31.0% |
| Septic fields very limited | 86.4% |
| Clay swell (LEP, by area) | 1.9% |
| High-swell land (LEP 6%+) | 0.7% |
| Mapped soil | 601 acres |
What the numbers mean here
On 31% of Union Grove's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 86% of the land very limited for septic absorption fields.
Drought in Upshur County
100% of Upshur 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 Union Grove. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75647 | 100% | 2 | $0 |
Homes in Union Grove
| Housing units | 248 |
| Median year built | 2003 |
| Built before 1980 | 15% |
| Built 2000 or later | 69% |
| Owner-occupied | 97% |
| Median value, owner-occupied | $224,500 |
| Single-family detached | 96% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Warren City | 2 mi | 0% | 35% |
| Gladewater | 3 mi | 2% | 32% |
| Clarksville City | 3 mi | 9% | 44% |
| East Mountain | 3 mi | 0% | 34% |
| White Oak | 5 mi | under 1% | 40% |
| Longview | 10 mi | 1% | 30% |
| Gilmer | 11 mi | 0% | 27% |
| Big Sandy | 11 mi | 0% | 40% |
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