Carrollton sits on some of the most expansive clay soil in the country. Stretching across Dallas, Denton, and Collin counties, the city lies in the Blackland Prairie region—known for “black gumbo” clay that swells dramatically when wet and shrinks hard during dry Texas summers. This constant movement puts relentless pressure on pool shells, plumbing lines, concrete decks, and every seal and fitting in a pool system.

Soils in parts of Carrollton contain over 50% clay, making the area one of the most unstable in the U.S. For homeowners, that means your pool is under constant stress from ground movement you rarely see but always feel over time.

Whether you’re in Castle Hills, Austin Waters, Country Place, Coyote Ridge, Oak Hills, Indian Creek Estates, Historic Downtown, or any established neighborhood, every pool faces the same soil challenges. Older pools built during Carrollton’s 1970s–1990s growth period are especially prone to leaks as materials age and seals deteriorate.