A few regions containing expansive clay soil with a slight to moderate potential for expansion are found in Connecticut. 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) |
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