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Leak too quiet to find?
Tracer gas finds what microphones can't hear. Call to reach a provider.
(813) 303-9621Free call connection · Open 24/7 · Plant City, Brandon, Valrico, Seffner & DoverTracer gas leak detection introduces a safe, non-toxic gas mixture, typically mostly nitrogen with a small amount of hydrogen, into a drained or isolated line at low pressure. The gas escapes through the leak, rises through soil, concrete or pavers, and a sensitive detector moved along the pipe route picks it up. The highest reading marks the leak.
When Is Tracer Gas Used?
- Quiet leaks too small to make an audible sound
- Plastic pipe (PEX, PVC, CPVC), which carries sound poorly
- Deep lines or lines under thick slabs, pavers or asphalt
- Noisy environments where traffic or equipment drowns out acoustic listening
- Pool lines under decks where acoustic readings are unclear
- Confirming an acoustic or thermal finding before cutting
It's often the next step when acoustic leak detection can't get a clear peak.
How a Tracer Gas Test Works
- Isolate the line and confirm the leak with a pressure test.
- Drain or push out the water where needed so gas can move through the pipe.
- Introduce the gas at low pressure through a fitting or test port.
- Give it time to migrate out of the leak and up through the ground or slab.
- Sniff the surface along the pipe route with the detector, including cracks, joints and drill-free test points.
- Mark the strongest reading.
Pro tip: Gas escapes most easily through cracks, expansion joints and grout lines, so the detector is run along those first. The first reading may be at a joint near the leak rather than right over it, and the technician narrows from there.
Is Tracer Gas Safe?
Yes, when used as intended. The common leak-detection mixture is mostly nitrogen, the main gas in the air we breathe, with a small amount of hydrogen at a concentration that isn't flammable. It's non-toxic, doesn't affect drinking water once the line is flushed, and disperses quickly. Some providers use helium instead for certain applications.
Tracer Gas vs. Air Injection
| Method | How it finds the leak | Best for |
|---|---|---|
| Air injection | Air bubbling out through wet soil makes a sound picked up acoustically | Service lines and pool lines in soil |
| Tracer gas | Gas rises to the surface and is detected chemically | Quiet leaks, under concrete, plastic pipe |
Tracer Gas in Plant City
Many newer Plant City homes use PEX or CPVC supply lines, which carry sound less well than copper, and many lots have pavers, thick driveways and pool decks over buried lines. Both make tracer gas especially useful here. It's also helpful on longer rural service lines where saturated sandy soil after summer rain dampens sound.
What Should You Expect on the Day?
Because tracer gas needs the line drained or isolated, water to part or all of the house is usually off for part of the visit. The technician will explain which fixtures can't be used and for how long. Gas takes time to migrate through soil and concrete, so there may be a waiting period between injecting it and scanning. Expect the detector to be run slowly along floors, joints, the edges of slabs, and the ground over buried lines. After the leak is found, the line is flushed and refilled, and you may hear air sputtering from faucets briefly as the system clears. If the leak is under a slab, the same marked spot guides the slab leak repair plan.
After the Leak Is Found
The marked spot guides a small, targeted repair, then the line is refilled, flushed and pressure tested. Call (813) 303-9621 for a free quote through our Plant City, FL leak detection services.
Warning: Tracer gas testing should only be done by trained technicians with proper regulators and detectors. Never pressurize household water lines with compressed gas yourself.
Tracer Gas Leak Detection FAQs
What is tracer gas leak detection?
A safe gas mixture is put into the isolated line. It escapes through the leak and rises to the surface, where a detector finds it and marks the spot.
Is tracer gas safe for my home?
Yes. The mixture used is non-toxic and non-flammable at the concentrations used, and it disperses quickly.
Can tracer gas find leaks under concrete?
Yes. Gas works its way up through concrete, joints and cracks, making it useful for slab and paver leaks.
Why not just use acoustic detection?
Acoustic works well for loud leaks in metal pipe. Tracer gas is better for quiet leaks, plastic pipe and noisy or deep locations.
How do I get a quote for tracer gas leak detection?
Call (813) 303-9621 and describe the leak and pipe type if you know it. A local provider can give you a free quote.