California

Regions containing expansive clay soil are found along the coast and parts of the central valley, but they may vary. If you have concerns consult an experienced geologist.

Adapted from the “Swelling Clays Map Of The Conterminous United States” by W.W. Olive, A.F. Chleborad, C.W. Frahme, Julius Schlocker, R.R. Schneider, and R.L Shuster; 1989

MAP LEGEND

Red Unit contains abundant clay having high swelling potential Blue Part of unit (generally less than 50%) consists of clay having high swelling potential Orange    Unit contains abundant clay having slight to moderate swelling potential Green Part of unit (generally less than 50%) consists of clay having slight to moderate swelling potential Brown Unit contains little or no swelling clay Yellow Data insufficient to indicate clay content of unit and/or swelling potential of clay (Shown in westernmost states only)

California Contractors Listings

To see the services listed for this state – open the comments. 

These are self listings and have not been evaluated by me. If you have positive or negative experiences with any of the services listed here – Please feel free to comment on them.