Expansive clay soil moves, and plumbing moves with it
Much of Collin and Denton County sits on Blackland Prairie clay, which swells when it takes on water and shrinks when it dries out. That seasonal movement is behind the foundation reputation this region has, and it puts steady stress on buried sewer lines and on water lines running through or beneath a slab. It is a large part of why slab leaks and sewer line offsets come up more often here than in regions with stable soil.

