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Coyote Flats, Texas
Inside Coyote Flats' city limits, shrink-swell clay limits houses without basements on 78% of mapped land, the 3rd-highest of 13 cities in Johnson County. A shallow water table limits basements on 1%.
That clay share is above Johnson County's 51%. FEMA's flood data list 2 flood losses since 2016 in the 2 ZIP codes overlapping the city. Of its 160 homes, 19% were built before 1980; the median dates from 1997.
Data as of October 13, 2026 · sources · in Johnson 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 Coyote Flats
Foundation repair in Coyote Flats: shrink-swell clay limits slab homes on 78% of Coyote Flats' mapped land, more than in 83% of Texas cities.
About 100 of Coyote Flats' 160 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 Coyote Flats city limits
| Expansive clay (limits slab homes) | 77.8% |
| High water table (limits basements) | 0.5% |
| Septic fields very limited | 79.9% |
| Clay swell (LEP, by area) | 9.6% |
| High-swell land (LEP 6%+) | 77.8% |
| Mapped soil | 1,218 acres |
What the numbers mean here
Clay swell averages a linear extensibility of 9.6% by land area here, and 78% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 78% of the mapped land.
Clay shrinks as it dries: 100% of Johnson County is in drought on the latest map, and 78% of Coyote Flats' mapped land has shrink-swell clay.
USDA rates 80% of the land very limited for septic absorption fields.
Drought in Johnson County
100% of Johnson 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 Coyote Flats. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 76031 | 86% | 2 | $45,047 |
| 76009 | 14% | 0 | $0 |
Homes in Coyote Flats
| Housing units | 160 |
| Median year built | 1997 |
| Built before 1980 | 19% |
| Built 2000 or later | 44% |
| Owner-occupied | 94% |
| Median value, owner-occupied | $265,600 |
| Single-family detached | 67% |
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