Signs of a Hidden Leak (and What to Do First) | Brimer Plumbing Blog

Hidden leaks rarely announce themselves with a visible spray. Instead, they leave subtle clues. A water bill that creeps up without a clear reason—especially if usage doubles or triples—is one of the strongest indicators. Musty or earthy smells in a bathroom, basement, or crawl space often point to moisture behind walls or under flooring. Discoloration on ceilings or walls, warped baseboards, or spongy spots in hardwood can mean water has been migrating for weeks or months. In mountain homes, where freeze-thaw cycles stress pipes and foundations, leaks often develop at joints, under slabs, or in crawl spaces that go unnoticed until damage is significant.

If you suspect a leak, act quickly. First, locate your main water shutoff and know how to use it—in an emergency, stopping the flow matters more than finding the exact source. Check visible fixtures: toilet flappers, faucet connections, under sinks. A simple test: turn off all water-using appliances and fixtures, then watch your meter. If the dial or digital readout moves, you have a leak. For leaks you can’t locate or access, or when you see active dripping, call a plumber. Professional leak detection—using acoustic equipment, thermal imaging, or pressure testing—can pinpoint the source without unnecessary demolition. The sooner you address it, the less damage to structure, finishes, and peace of mind.

---