Orange County, CA Shrink-Swell Risk

Orange County, CA's soil, for shrink-swell risk

Moderate

Orange County, CA: USDA's soil survey rates 62.9% of the county "Moderate" for shrink-swell potential (3.04% linear extensibility). Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

What Orange County's reading doesn't cover

Two lots a mile apart in Orange County can carry different soil, even though they share one countywide reading. 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 Orange County.

What it costs to find out, versus to ignore it

With Orange County, CA 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 Orange County, CA compares

Nationally, Orange County, CA is the 1,164-most-constrained of 3,085 rated counties for shrink-swell soil. Within California alone it ranks 26 of 58. The county spans 793 square miles, home to 3,170,435 people.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Dent County, MO and Martin County, KY 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 California

Every county in California is on this site, including Lassen County, CA and San Joaquin County, CA. The full underlying dataset is downloadable directly, one row per county.