Expansive clay soil near the river moves pipe
Much of Mission, especially the neighborhoods closer to the Rio Grande and old citrus-grove land, sits on expansive clay and caliche. That soil swells when it's saturated after a summer storm and shrinks hard during dry stretches, and that repeated movement is one of the most common reasons a slab leak or a cracked yard line shows up in homes that are otherwise well maintained.
When we're called out for a suspected leak in these areas, we check both the slab plumbing and the yard-line route before cutting, since soil movement can affect either one.
