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Big Lake, Texas
Inside Big Lake's city limits, shrink-swell clay limits houses without basements on 4% of mapped land. A shallow water table limits basements on under 1%.
That clay share is below Reagan County's 15%. FEMA's flood data list no flood losses since 2016 in ZIP code 76932 overlapping the city. Of its 1,029 homes, 43% were built before 1980; the median dates from 1983.
Data as of October 13, 2026 · sources · in Reagan 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 Big Lake
Foundation repair in Big Lake: shrink-swell clay limits slab homes on 4% of Big Lake's mapped land.
About 800 of Big Lake's 1,029 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 Big Lake city limits
| Expansive clay (limits slab homes) | 3.8% |
| High water table (limits basements) | 0.1% |
| Septic fields very limited | 24.0% |
| Clay swell (LEP, by area) | 4.0% |
| High-swell land (LEP 6%+) | 3.8% |
| Mapped soil | 1,526 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Reagan | 73% | n/a |
| Conger | 19% | n/a |
| Angelo | 4% | n/a |
| Tobosa | under 1% | n/a |
| Upton | under 1% | n/a |
| Sanderson | under 1% | n/a |
What the numbers mean here
With shrink-swell clay on 4% and a shallow water table on under 1% of the land, the soil survey points to neither problem across most of Big Lake; conditions still vary lot by lot.
Drought in Reagan County
100% of Reagan 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 Big Lake. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 76932 | 99% | 0 | $0 |
Homes in Big Lake
| Housing units | 1,029 |
| Median year built | 1983 |
| Built before 1980 | 43% |
| Built 2000 or later | 16% |
| Owner-occupied | 75% |
| Median value, owner-occupied | $157,900 |
| Single-family detached | 74% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Rankin | 29 mi | 4% | 0% |
| Iraan | 33 mi | 3% | 0% |
| Mertzon | 38 mi | 15% | 0% |
| McCamey | 46 mi | 0% | 0% |
| Sterling City | 52 mi | 60% | 0% |
| Crane | 55 mi | 0% | 0% |
| Eldorado | 56 mi | 70% | 0% |
| San Angelo | 62 mi | 35% | under 1% |
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