How Can I Find a Water Leak Inside a Wall or Ceiling?

To find a water leak inside a wall or ceiling, shut off every tap and appliance and check your water meter; if it still moves, you likely have a hidden leak. Most indoor leaks come from corroded or aging pipes or loose connections behind drywall. Water can travel before it shows, so track moisture patterns instead of chasing sound. Pros pinpoint hidden leaks with electronic leak detection, video inspection, and targeted pressure or air tests, then open the smallest area needed for repair. Our technicians handle leak locating and repair for many homes across the Bellingham area.

Watch for these confirmation clues:

• A sudden increase in your water bill
• Musty smells or visible mold or mildew
• Reduced water pressure with no fixtures running

If you see active dripping or a bulging ceiling, shut off the main water valve and call a licensed plumber.

Updated: 2026-06-30

Need help in Bellingham, WA? Call (425) 387-1507 or book online.