Arizona’s expansive clay soils, extreme ground temperatures, and notoriously hard water create conditions that wear down under-slab pipes faster than nearly anywhere else in the U.S. Slab leaks often go undetected for weeks, quietly driving up water bills and causing foundation damage before a single visible sign appears. Knowing what to look for – warm floor spots, unexplained pressure drops, or a meter that keeps spinning when all fixtures are off – can mean the difference between a $1,500 repair and a $10,000 structural fix. Repair options range from targeted spot fixes on isolated breaks to full repipes on older copper systems that have seen too many hard-water years. Arizona homeowners in 2025 should also know that permitted plumbing work and early insurance documentation both protect them financially when slab issues arise.