Washington County, OK Shrink-Swell Risk

What Washington County, OK's soil means for a foundation

Moderate

USDA's SSURGO data puts Washington County, OK's soil at "Moderate" shrink-swell potential, an area-weighted linear extensibility of 4.58% across 63.4% of the county's surveyed land. Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

This is a county figure, not a lot figure

USDA's survey covers the whole of Washington County, OK 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 Washington County, OK rating "Moderate", 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 Washington County, OK compares

Nationally, Washington County, OK is the 373-most-constrained of 3,085 rated counties for shrink-swell soil. Within Oklahoma alone it ranks 10 of 77. The county spans 416 square miles, home to 54,060 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Klickitat County, WA and Aransas County, TX 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 Oklahoma

Every county in Oklahoma is on this site, including Jefferson County, OK and Cleveland County, OK. The full underlying dataset is downloadable directly, one row per county.