Slab leaks can cause tens of thousands in structural damage before you even notice. Know the signs before they become a disaster.
A slab leak is a water supply or drain line leak occurring within or beneath your home's concrete foundation. In Phoenix's soil conditions — with significant clay content and temperature swings — slab leaks are more common than homeowners realize.
**Sign #1: Unexplained water bill spikes.** A slab leak as small as 1/8 inch can waste 10,000 gallons per month. If your bill jumped without any behavior change, get a pressure test.
**Sign #2: Warm or hot spots on your floor.** A hot water line break under the slab radiates heat upward through the concrete. If you notice a warm patch on your tile or hardwood, this is a classic hot-water slab leak indicator.
**Sign #3: The sound of running water.** This is the one people ignore most. If you can hear water moving when everything in your home is off, a leak is actively flowing. Don't wait — call immediately.
**Sign #4: Visible cracks in floors or walls.** Water erodes soil beneath slabs, causing shifting. New cracks — especially diagonal ones near corners — after a bill spike are a strong indicator.
**Sign #5: Mold or mildew odor.** Slow slab leaks saturate the slab and rise into flooring and baseboards, creating persistent mold conditions even when you can't see visible moisture.
Precision Plumbing uses thermal imaging and acoustic detection to locate slab leaks within the first hour of diagnostics — without tearing up your floors. We pinpoint the exact location before we ever break ground.