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Mobile City, Texas
Inside Mobile City's city limits, shrink-swell clay limits houses without basements on 82% of mapped land, the 4th-highest of 6 cities in Rockwall County. A shallow water table limits basements on 0%.
That clay share is above Rockwall County's 72%. FEMA's flood data list 9 flood losses since 2016 in ZIP code 75087 overlapping the city. Of its 118 homes, 4% were built before 1980; the median dates from 1986.
Data as of October 13, 2026 · sources · in Rockwall 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 Mobile City
Foundation repair in Mobile City: shrink-swell clay limits slab homes on 82% of Mobile City's mapped land, more than in 88% of Texas cities.
| 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 Mobile City city limits
| Expansive clay (limits slab homes) | 81.6% |
| High water table (limits basements) | 0.0% |
| Septic fields very limited | 81.6% |
| Clay swell (LEP, by area) | 12.0% |
| High-swell land (LEP 6%+) | 81.6% |
| Mapped soil | 10 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Houston Black | 82% | 91% |
| Heiden | 13% | 80% |
| Fairlie | 3% | 70% |
| Wilson | 2% | 88% |
What the numbers mean here
Clay swell averages a linear extensibility of 12.0% 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 82% of the mapped land.
Clay shrinks as it dries: 100% of Rockwall County is in drought on the latest map, and 82% of Mobile City's mapped land has shrink-swell clay.
USDA rates 82% of the land very limited for septic absorption fields.
Drought in Rockwall County
100% of Rockwall 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 Mobile City. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75087 | 100% | 9 | $272,393 |
Homes in Mobile City
| Housing units | 118 |
| Median year built | 1986 |
| Built before 1980 | 4% |
| Built 2000 or later | 8% |
| Owner-occupied | 36% |
| Median value, owner-occupied | $22,200 |
| Single-family detached | 2% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Rockwall | 2 mi | 83% | under 1% |
| Fate | 2 mi | 81% | under 1% |
| McLendon-Chisholm | 5 mi | 81% | 1% |
| Heath | 6 mi | 82% | 3% |
| Royse City | 6 mi | 87% | 4% |
| Lavon | 7 mi | 80% | under 1% |
| Rowlett | 8 mi | 78% | under 1% |
| Nevada | 8 mi | 82% | 0% |
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