Immediately shut off the main water valve to your home to stop the flow and minimize water damage. Next, turn off any electrical power near the leak, use buckets and towels to contain the water, and call a licensed plumber for professional repair.

A small, slow leak is often not an immediate emergency, but a major rupture or any sewage backup is a serious plumbing emergency due to severe health hazards and rapid property damage. In any case, a waste pipe leak needs professional repair as soon as possible to prevent mold and contamination.

Signs of an underground leak include a sudden, unexplained spike in your water bill, persistent soggy or overly green spots in your lawn, or a constant sound of running water when all fixtures are off. You can also check your water meter to see if the dial is spinning while all water use is stopped

All leaks are serious and can lead to significant issues. Even a small drip can cause costly damage over time, including mold growth, structural deterioration, and an increased risk of electrical fire or electrocution if water contacts wiring. Small leaks also risk contaminating your drinking water supply.

Plumbers use non-invasive, high-tech tools to locate hidden leaks. These tools include acoustic leak detectors to "listen" for the sound of escaping water, thermal imaging cameras to spot cold or damp areas behind walls, and moisture meters to measure dampness in surfaces.