How Smoke Testing Detects Pest Entry Points into Buildings
What Is Smoke Testing?
Smoke testing is a diagnostic process used to trace leaks or defects in plumbing systems. It involves introducing non-toxic, artificial smoke into the sewer lines using a powerful fogger and fan system, like the FogTrace. As the smoke pressurizes the system, it seeks the path of least resistance. Wherever there’s a hole, crack, opening, uncapped pipe, or degraded seal, the smoke escapes.
And that’s your entry point.
Why Pest Control Pros Are Using Smoke Test Machines
Pest management professionals (PMPs) are now turning to smoke testing as a way to visually identify where rodents and insects are entering structures originating from the sewer system. Here’s how it works in real-world pest control scenarios:
- Uncovering Hidden Gaps
Sewer-connected pests can use even the smallest gaps at plumbing connections, vent stacks, clean-outs, or pipe junctions to infiltrate a building. A visual inspection might miss these (especially if it’s an inaccessible void) . But when smoke starts pouring from a baseboard, wall void, toilet seal, or drain, it’s undeniable proof that pests have a path—and that path leads inside.
- Detecting Dry Traps and Open Pipes
A dry P-trap or abandoned pipe can act like an open door for pests. With smoke testing, PMPs can quickly confirm whether traps are working or if open plumbing is creating access from the sewer to the living space.
- Pinpointing Rodent Pathways
Rats follow plumbing like a subway map. If they’re coming up through the floor or wall, smoke testing can often show the exact route—helping you find it fast, before further damage or infestation occurs.
Benefits Of Smoke Testing Over Traditional Methods
- Faster diagnosis: Skip the weeks (or months) of trial-and-error that come with traditional exclusion and monitoring.
- No guesswork: Smoke makes entry points visible—no speculation needed.
- Comprehensive: Reaches vents, lateral lines, and vertical stacks all at once.
- Safe and efficient: The fog used in professional-grade smoke tests is safe, non-toxic, and dissipates quickly.
Why The Sewer Assassin An Added Advantage ?
When paired with the Sewer Assassin monitoring system, PMPs can know on Day One whether pests are using or inside the plumbing. And when smoke testing confirms an active breach, targeted treatment and repairs can begin immediately. Before these tools, it could take multiple visits, continuous treatments, or extensive trapping to even suspect sewer involvement. Read more about how the Sewer Assassin pest and rodent bait station works alongside the Fogtrace.
Final Thoughts: Smoke Testing as the Future of Pest Inspections
Smoke testing isn’t just a plumbing tool anymore it’s become one of the most valuable resources in modern pest management. If you’re dealing with elusive rodents, roaches, or drain flies, especially those coming back again and again, it might be time to smoke them out—literally.
For PMPs ready to level up their inspections, smoke testing turns invisible pest highways into visible evidence, saving time, reducing callbacks, and increasing customer trust.Need help detecting hidden pest entry points? Learn more about how the Sewer Assassin + FogTrace smoke test machine for plumbing can redefine your inspections and elevate your pest control strategy.
Frequently Asked Questions About
Plumbing Smoke Testing in Pest Control
What is plumbing smoke testing in pest control?
It’s a diagnostic method that introduces non-toxic smoke (fog) into plumbing lines; smoke escapes at defects, revealing the exact entry points pests are using.
Why is smoke testing valuable to PMPs?
It makes hidden pathways visible, identifies dry traps or open lines, and confirms rodent and insect routes that inspections might miss, speeding accurate diagnosis. Why pay a plumber to conduct this test when you can keep the revenue in house?
What tools are used for pest-oriented smoke tests?
Systems like FogTrace are designed for PMPs, combining powerful fogger & fan to send pressurized fog into the plumbing and visualize leaks and entry points efficiently.
How do smoke tests and Sewer Assassin work together?
Sewer Assassin monitors and controls sewer-based pests inside plumbing; if activity is detected, FogTrace smoke testing confirms the breach location to guide repairs and targeted treatments.
What common defects does smoke testing expose?
Dry or failed traps, broken, deteriorating, uncapped or abandoned lines, degraded seals at toilets or vanities, and cracks at pipe junctions will show visible smoke.
When should smoke testing be deployed?
Use it early when exterior routes are ruled out, when activity is persistent without clear entry points, or in multi-unit and aging buildings with complex plumbing.
