Our situation was a little more complex. We bought our house (central TX) in early 1999, and that summer was quite dry. No sprinkler system at the time. We found out later that the soil on the property has varying amounts of clay. Clay responds vigorously to moisture changes. As for the slab, first there was some settling on one side, which caused an in-slab plumbing leak, which led to more settling. $20K+ later, we've got more than 40 piers (each one 12 ft deep) supporting our house.
I am in Central Texas as well. Comanche & Erath Counties. You?
“$20K+ later...”
Oh man. What a rude surprise. $20K+ later? What an awful nightmare when that money could have been spent on other important pressing things.