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Gilmer, Texas
Inside Gilmer's city limits, shrink-swell clay limits houses without basements on 0% of mapped land. A shallow water table limits basements on 27%, the 5th-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 the 2 ZIP codes overlapping the city. Of its 2,006 homes, 57% were built before 1980; the median dates from 1975.
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 2 overlapping ZIPs
of homes built before 1980
Foundation repair in Gilmer
Foundation repair in Gilmer: shrink-swell clay limits slab homes on 0% of Gilmer's mapped land.
About 1,300 of Gilmer's 2,006 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 Gilmer city limits
| Expansive clay (limits slab homes) | 0.0% |
| High water table (limits basements) | 26.9% |
| Septic fields very limited | 86.0% |
| Clay swell (LEP, by area) | 2.4% |
| High-swell land (LEP 6%+) | 3.8% |
| Urban land, not rated | 14.9% |
| Mapped soil | 2,432 acres |
What the numbers mean here
On 27% of Gilmer'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 Gilmer. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75644 | 84% | 2 | $78,007 |
| 75645 | 16% | 0 | $0 |
Homes in Gilmer
| Housing units | 2,006 |
| Median year built | 1975 |
| Built before 1980 | 57% |
| Built 2000 or later | 18% |
| Owner-occupied | 56% |
| Median value, owner-occupied | $166,700 |
| Single-family detached | 63% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Union Grove | 11 mi | 1% | 31% |
| East Mountain | 11 mi | 0% | 34% |
| Warren City | 13 mi | 0% | 35% |
| Gladewater | 13 mi | 2% | 32% |
| Clarksville City | 14 mi | 9% | 44% |
| Ore City | 14 mi | 0% | 49% |
| Big Sandy | 14 mi | 0% | 40% |
| White Oak | 15 mi | under 1% | 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