Underground Water Leak Detection in Lynnwood, WA
- No-dig detection
- Written findings
- Lynnwood and Snohomish County
A buried leak rarely announces itself. Water follows the path of least resistance, so the wet spot you see may be many feet from the real break. We trace underground leaks to the exact point so excavation stays small.
Where underground leaks hide
Lynnwood’s mix of clay, glacial till and sandy fill changes how water travels. In dense clay water can surface far from the leak. In sandy soil it may drain away and show nothing at all, so a rising bill is often the only sign.
Common causes
- Corrosion of older galvanized or copper pipe
- Tree roots pressing on lines and joints
- Ground movement and heavy winter rain
- Past damage from landscaping or utility work
- Failed fittings at the meter or house connection
What it protects
Fast detection limits wasted water, prevents soil washout under driveways and walkways, and avoids growing damage near foundations. See also service line leak detection and trenchless repair.
Irrigation leak or service line leak?
Both cause wet ground. A service line is always under pressure, so the meter moves with irrigation off. If the meter only moves when the irrigation zone runs, the leak is likely in that zone. We separate the two so you do not pay for the wrong repair.
Choosing the method by pipe and site
| Situation | Method | Reason |
|---|---|---|
| Metal pipe (copper, galvanized) | Acoustic listening and correlator | Sound travels well through metal |
| Plastic pipe (HDPE, PEX) | Tracer gas, ground microphone, pressure test | Sound fades quickly in plastic |
| Under concrete or asphalt | Correlator, thermal imaging | Surface access is limited |
| Noisy sites near traffic | Testing in quieter windows | Ambient noise can mask leaks |
Why precise marking matters
Each extra foot of trench adds labor, restoration and risk of hitting other utilities. Marking within a small radius keeps the repair small. Washington law requires an 811 call before digging.
Customer reviews
Frequently asked questions
Can you find a leak under concrete?
Yes, acoustic and correlation methods work through slabs, driveways and patios, and thermal imaging helps on hot lines.
What if the ground looks dry?
Dry ground does not rule out a leak. Sandy or well-drained soil can hide it, which is why we start with a meter and pressure test.
Could the leak be my sprinkler system?
Possibly. If the meter only moves while irrigation runs, the leak is likely in that zone, not the service line.