Warm spot on the floor, or a water bill that jumped for no reason?

A slab leak is usually corrosion working through a copper water line that runs under your home's concrete foundation. A few things drive it: water chemistry (acidic or mineral-heavy water is harder on copper over time), abrasion from the pipe expanding and contracting against concrete, rebar, or gravel over years, ground movement, and sometimes water pressure that's higher than the pipe was ever meant to handle.

Arizona adds its own well-documented factor: expansive soil[1] — clay that swells when it gets wet and shrinks again in the dry season, a cycle that stresses foundations, buried pipe, and slabs generally across the state. Soil conditions can vary enormously over short distances, and we don't have a Casa Grande-specific soil survey — so treat this as the real, statewide pattern behind slab leaks in Arizona, not a confirmed fact about your specific lot.

Worth knowing: unlike a water heater or a clogged drain, this isn't something every home here is equally likely to run into. Copper-under-slab construction was most common nationally through roughly the 1980s and 90s, and Casa Grande's typical home was built well into the 2000s — meaning most local homes sit at the young edge of, or past, that higher-risk window. This page is genuinely useful if it applies to your home, especially in the older pockets of the city, but it isn't a universal concern the way a water heater's replacement cycle is.

Tell us what you're seeing — a floor spot, a water bill spike, a sound, low pressure, whatever it is. We connect you with a real, ROC-licensed Arizona plumbing professional who can actually locate the leak, confirm whether it's the slab or something else, and give you an upfront estimate before any work begins. The professional sets the price and the timeline, not us — our job is getting you to the right person fast, not quoting the work ourselves.