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Mission, Texas
Inside Mission's city limits, shrink-swell clay limits houses without basements on 25% of mapped land. A shallow water table limits basements on 5%, the 2nd-highest of 22 cities in Hidalgo County.
That clay share is above Hidalgo County's 12%. FEMA's flood data list 298 flood losses since 2016 in the 2 ZIP codes overlapping the city. Of its 33,423 homes, 15% were built before 1980; the median dates from 2000.
Data as of October 13, 2026 · sources · in Hidalgo 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 Mission
Foundation repair in Mission: shrink-swell clay limits slab homes on 25% of Mission's mapped land.
About 22,700 of Mission's 33,423 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 Mission city limits
| Expansive clay (limits slab homes) | 25.3% |
| High water table (limits basements) | 4.6% |
| Septic fields very limited | 29.4% |
| Clay swell (LEP, by area) | 5.1% |
| High-swell land (LEP 6%+) | 25.3% |
| Urban land, not rated | 4.1% |
| Mapped soil | 23,230 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Hidalgo | 41% | 0% |
| Runn | 17% | n/a |
| Reynosa | 9% | n/a |
| Harlingen | 4% | n/a |
| Raymondville | 4% | n/a |
| Brennan | 3% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 5.1% by land area here, and 25% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 25% of the mapped land.
Clay shrinks as it dries: 100% of Hidalgo County is in drought on the latest map, and 25% of Mission's mapped land has shrink-swell clay.
Drought in Hidalgo County
100% of Hidalgo 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 Mission. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 78572 | 78% | 182 | $6.1 million |
| 78574 | 14% | 116 | $3.8 million |
Homes in Mission
| Housing units | 33,423 |
| Median year built | 2000 |
| Built before 1980 | 15% |
| Built 2000 or later | 51% |
| Owner-occupied | 71% |
| Median value, owner-occupied | $175,700 |
| Single-family detached | 68% |
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