Mifflin County, PA Shrink-Swell Risk

What Mifflin County, PA's soil means for a foundation

Low

USDA's SSURGO data puts Mifflin County, PA's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 1.69% across 81.9% of the county's surveyed land. Among the 3,144 counties on this site, that's the clean result: little shrink-swell movement, standard construction the likely outcome.

This is a county figure, not a lot figure

USDA's survey covers the whole of Mifflin County, PA at once, not any single address. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Mifflin County.

Report cost vs. repair cost

With Mifflin County, PA 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.

Mifflin County's rank among Pennsylvania counties

Nationally, Mifflin County, PA is the 2,289-most-constrained of 3,085 rated counties for shrink-swell soil. Within Pennsylvania alone it ranks 24 of 67. Mifflin County, PA is 411 square miles with a population of 45,935.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Anderson County, KS and Sanpete County, UT 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 Pennsylvania

Every county in Pennsylvania is on this site, including York County, PA and Adams County, PA. The full underlying dataset is downloadable directly, one row per county.