Dauphin County, PA Shrink-Swell Risk

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

Low

USDA's SSURGO data puts Dauphin County, PA's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 1.56% across 94.8% of the county's surveyed land. That's as favorable a county-level reading as this dataset produces - standard foundation practice, pending one lot's own geotechnical report.

This is a county figure, not a lot figure

USDA's survey covers the whole of Dauphin County, PA at once, not any single address. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Report cost vs. repair cost

With Dauphin 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.

How Dauphin County, PA compares

Nationally, Dauphin County, PA is the 2,424-most-constrained of 3,085 rated counties for shrink-swell soil. Within Pennsylvania alone it ranks 30 of 67. Dauphin County covers 525 square miles and counts 293,029 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Iowa County, IA and Clinton County, MI 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 Butler County, PA and Bradford County, PA. The full underlying dataset is downloadable directly, one row per county.