Yolo County, CA Shrink-Swell Risk

Shrink-swell potential in Yolo County, CA

High

Soil across 39.9% of Yolo County, CA comes back "High" in USDA's shrink-swell data, averaging 6.02% linear extensibility. Soil at this level can crack a standard foundation without moisture-control measures - consistent watering near the foundation, correct grading, root barriers - or added structural design.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Yolo County, CA - never a reading for one specific parcel. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Yolo County will actually do.

Yolo County: the real numbers

With Yolo County, CA rating "High", the gap between finding out early and finding out late is the whole decision. A geotechnical report runs $1,000-$5,000 (typically $2,700); an actual foundation repair, once cracking sets in, typically runs $5,000-$15,000 (around $10,000 typical) - roughly 4x the report.

Yolo County's rank among California counties

Among the 3,085 rated counties on this site, Yolo County, CA ranks 128 most-constrained nationally, and 2 of 58 within California. Yolo County covers 1,013 square miles and counts 225,251 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Moore County, TX and Hickman County, TN are worth a look for comparison.

How this reading is built, and its real limits · The warning signs of expansive-clay damage, explained

Elsewhere in California

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