Foundation Repair & House Leveling in McAllen, TX.

McAllen sits on the Hidalgo–Raymondville clay loam association — fine, mixed, hyperthermic Typic Calciustolls and Haplusterts laid down on the old Pleistocene Lissie/Beaumont terrace north of the modern floodplain.

Plasticity index typically runs 25–45, lower than the delta clays in Cameron County but still firmly in the 'high shrink-swell' band per NRCS.

Subsurface caliche layers (CaCO3 nodules) at 3–6 ft are common across north McAllen and Sharyland and create perched water conditions: rain infiltrates fast through the upper loam, hits the caliche, and spreads laterally under slabs instead of draining.

That's why neighborhoods around 10th Street and north of Trenton see edge heave even when surface drainage looks fine.

South of Business 83, the soil grades into older alluvial clay with PI closer to 40 and a deeper active zone (8–10 ft).

New subdivisions on engineered select fill consolidate for 5–10 years over either profile, which is why we engineer pier depth to the specific soil column under each home rather than using a one-size depth.