Thomas County, KS Shrink-Swell Risk
Thomas County, KS's soil, for shrink-swell risk
Low
Thomas County, KS: USDA's soil survey rates 75.2% of the county "Low" for shrink-swell potential (2.69% linear extensibility). Among the 3,144 counties on this site, that's the clean result: little shrink-swell movement, standard construction the likely outcome.
What Thomas County's reading doesn't cover
Two lots a mile apart in Thomas County can carry different soil, even though they share one countywide reading. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).
What it costs to find out, versus to ignore it
With Thomas County, KS rating "Low", a geotechnical report is still worthwhile before a build, just less urgent than in a high-risk county. A geotechnical report runs $1,000-$5,000, typically around $2,700. Foundation repair, if a specific lot turns out to differ from the county average, runs $5,000-$15,000.
Where this sits nationally
Nationally, Thomas County, KS is the 1,425-most-constrained of 3,085 rated counties for shrink-swell soil. Within Kansas alone it ranks 85 of 105. Thomas County covers 1,075 square miles and counts 7,802 residents.
See how another county compares
Orleans Parish, LA carries this site's most-constrained reading. Lac qui Parle County, MN and Lyman County, SD are worth a look for comparison.
How this reading is built, and its real limits · Moisture management: the cheap fix that works on any soil
More of Kansas
Every county in Kansas is on this site, including Harper County, KS and Logan County, KS. The full underlying dataset is downloadable directly, one row per county.