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King County Plumbing

Find the leak before opening the wall

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Leak detection unit with sensor probe at a water-stained baseboard

A hidden leak is a guessing game until someone locates it. Leak detection uses acoustic listening, pressure testing, and thermal scanning to pin the leak to a spot, so the repair opens one square of wall or floor, not six.

How do you know you have one?

  • The water bill jumped and nothing changed in how you use it
  • The meter dial creeps with every fixture off
  • A warm spot on a slab floor, or a wall or baseboard that stays damp
  • Hissing in a wall when the house is quiet
  • Damp or green patches in the yard that follow the supply line's path

What does the visit look like?

The pro isolates zones, pressure-tests the lines, and listens for the leak, through the wall, under the slab, or in the yard on the service line. Then they mark it and quote the actual repair. Locating and fixing are usually quoted separately; the locate pays for itself in drywall that doesn't get opened up.

Why does it matter here?

A big share of the county's housing is either slab-on-grade (the 1980s and 90s suburbs especially) or post-war construction with original supply lines nearing the end of their run. A leak under a slab or in an old copper line doesn't announce itself, it just runs the meter.

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