PLUMBING
SMOKE TESTING
The Fastest Way to Find Plumbing Defects
Ask any plumber who regularly performs smoke tests and you’ll hear the same thing: it works—and it works exceptionally well. Few diagnostic methods deliver the same combination of speed, clarity, and reliability when it comes to locating plumbing defects.
A properly executed smoke test removes uncertainty from the diagnostic process. Instead of relying on assumptions or time-consuming trial and error, smoke testing provides clear, visual confirmation of exactly where a system is failing. If there’s a path for air to escape, smoke will make the defect immediately visible.
Whether you’re investigating sewer odors, hidden leaks, improper connections, or long-standing issues that have been difficult to pinpoint, smoke testing consistently turns hard-to-diagnose problems into straightforward repairs. For plumbers who adopt it, smoke testing quickly becomes an indispensable diagnostic tool—one that improves accuracy, saves time, and increases profitability by allowing plumbing defects to be identified and resolved quickly and with confidence.
What Is Plumbing Smoke Testing?
Plumbing smoke testing is a diagnostic method in which non-toxic smoke is introduced into a plumbing system to reveal defects. The smoke is delivered using a purpose-built smoke blower that is calibrated to move air and smoke through the system at controlled rates and pressures. This process reveals system defects without disturbing plumbing traps or other system components.
At its core a smoke test is an airflow test. The smoke follows air through the system and escapes through any defect – cracked pipes, failed joints, dry traps, improper connections etc. - If air or odor can get out, smoke will find it.
Smoke testing is widely used across a broad range of applications, from single-family homes and multifamily residential buildings to commercial, institutional, and industrial properties. Blowfish Blowers are designed to test DWV building plumbing systems both large and small and can also be used to test sewer laterals and other systems.
Why Plumbing Smoke Testing
Is So Effective
It Finds Plumbing Defects Fast
Smoke testing eliminates hours of guesswork. Instead of cutting walls, pulling fixtures, or “chasing smells,” you get instant visual feedback that points directly to the source.
It Provides Visual Confirmation
There’s no debating smoke. When smoke is coming out of a fitting or pipe the defect is undeniable—for you and the customer. This builds trust and makes approvals easy.
It Finds Defects No Other Method Can
Many plumbing faults never leak water or fail a pressure test. By visualizing airflow, smoke testing reveals air leaks that cameras and water-based methods can’t detect.
The Equipment Pays for Itself—Fast
Most professional smoke testing equipment pays for itself in one or two jobs. After that, it’s pure upside.
It Makes You a Better, More Profitable Plumber
Smoke testing lets plumbers diagnose problems faster, uncover issues others miss, and present undeniable proof to customers. That leads to faster approvals, fewer headaches, and more work completed—putting more money in your pocket without adding hours to your day.
Why Plumbing Smoke Testing is so Effective
It Finds Plumbing Defects Fast
Smoke testing eliminates hours of guesswork. Instead of cutting walls, pulling fixtures, or “chasing smells,” you get instant visual feedback that points directly to the source.
It Provides Visual Confirmation
There’s no debating smoke. When smoke is coming out of a fitting or pipe the defect is undeniable—for you and the customer. This builds trust and makes approvals easy.
It Finds Defects No Other Method Can
Many plumbing faults never leak water or fail a pressure test. By visualizing airflow, smoke testing reveals air leaks that cameras and water-based methods can’t detect.
The Equipment Pays for Itself—Fast
Most professional smoke testing equipment pays for itself in one or two jobs. After that, it’s pure upside.
It Makes You a Better, More Profitable Plumber
Smoke testing lets plumbers diagnose problems faster, uncover issues others miss, and present undeniable proof to customers. That leads to faster approvals, fewer headaches, and more work completed—putting more money in your pocket without adding hours to your day.
How Can I Make More Money Smoke Testing?
Smoke testing increases profitability in several measurable ways. First, it dramatically reduces diagnostic time. Instead of spending hours chasing sewer odors or guessing at hidden defects, smoke testing reveals the source quickly and visually. Less time per job means more jobs completed each week.
It also reduces costly callbacks. Smoke provides visual confirmation of all plumbing defects - this means the issue is resolved correctly on the first visit - reducing the chances of a customer calling back for additional work at no charge. Callbacks erode profit—smoke testing helps prevent them.
Smoke tests often reveal defects the customer didn’t even know existed, and in many cases these issues are unrelated to the original service call. Missing caps, broken connections, failed traps, and abandoned plumbing are commonly uncovered. These discoveries turn into profitable repair work. Over time, plumbers who offer smoke testing become known as the professionals who solve the jobs others cannot—supporting higher rates and stronger referrals.
Finally, smoke testing itself is a billable service. Some plumbers choose not to charge separately for smoke testing because the time savings alone make it worthwhile. Others charge anywhere from $200 to over $1,000 per smoke test, depending on the market and project. Either approach creates value—whether through faster diagnostics, higher perceived professionalism, or stronger margins—making smoke testing a meaningful revenue driver.
Faster diagnostics. Fewer callbacks. More approved work. Higher margins. Additional billable services.
How to Perform a Plumbing Smoke Test
Plumbing smoke testing is straightforward when performed correctly, but like any professional diagnostic method, the details matter. Controlled airflow, correct smoke formulation, and safe setup procedures are what separate a clean, professional smoke test from a smoky headache.
Blowfish provides the complete support system behind the process—detailed procedures, training videos, real-world case studies, and purpose-built equipment—giving plumbers the tools and guidance to perform smoke testing the right way from day one. Ready to see how it’s done? Check out the resources below:
Gear Selection Matters
When it comes to smoke testing, having the right equipment isn’t just about professionalism—it’s about safety, control, and efficacy. The smoke must be appropriate for plumbing systems, and it must be delivered at a controlled flow rate that reveals defects without blowing past traps, filling finished spaces with smoke, or creating unsafe conditions. Getting this wrong can damage systems and frustrate customers.
Blowfish Smoke Blowers were designed specifically to solve those problems. Built in the USA and engineered for real-world plumbing work, Blowfish equipment is designed to perform cleanly and predictably—especially when your blower is setup in a finished interior space.
Just as importantly, Blowfish Blowers are priced to make sense for working plumbers. Our blower kits offer flexible, complete solutions that scale with the job—providing more capability, more control, and better overall value than anything else in the category.
If you’re ready to add smoke testing to your workflow—or upgrade to equipment that’s built for how plumbers actually work— Blowfish offers a purpose-built solution you can rely on.
Ready to Add Smoke Testing to Your Plumbing Business?
Explore our plumbing smoke testing solutions to see how easy it is to add smoke testingto your workflow—and start turning faster diagnostics into higher profits.
Smoke Blowers
Smoke Pellets
Smoke Fluid
