Denton sits on some of the most unstable soil in North Texas. The city’s 88 square miles rest on two major geological formations—Grayson and Woodbine—and research shows the difference matters. The Grayson Formation contains highly expansive montmorillonitic clay, and areas built on it have over 300% more foundation damage than areas on Woodbine soils.

Like the rest of the Blackland Prairie, Denton’s soil is rich in smectite, bentonite, and montmorillonite—clays that can swell up to seven inches when wet and shrink dramatically during dry Texas summers. The flat terrain also leads to rapid saturation during spring rains and deep cracking in dry conditions, creating constant movement beneath your pool.

This ongoing soil shifting puts significant stress on pool shells, plumbing lines, skimmers, and decks. Pools built during Denton’s major growth in the 1980s–1990s are especially vulnerable as original materials age.

Whether you’re in Bridlewood, Robson Ranch, Savannah, Idiot’s Hill, Oak-Hickory, Rayzor Ranch, Quakertown, near the Downtown Square, or close to UNT or TWU, every pool in Denton faces the same geological pressures.