Four Years of a Mystery Sewer Smell, Solved in One 45-Minute Test
A Gilbert homeowner had chased an inconsistent sewer odor through their home for years. Here's how a FogTrace smoke test found the real source in under an hour.
An odor that moved around the house and refused to be pinned down
The homeowners had lived with an intermittent sewer-gas smell for almost four years. It never showed up in the same place twice: some days it was in the kitchen, other days the back bedroom, and some days there was no smell at all. Opening a window in the master bedroom seemed to make it fade, which only added to the confusion.
The home had been inspected multiple times before. Every visit ran into the same wall: with no fixed location and no consistent trigger, there was nothing steady to trace back to a source. This is exactly the kind of case our FogTrace plumbing smoke test service was built to solve.
Why FogTrace succeeded where past inspections couldn't
EZ Flow Plumbing recently added a FogTrace machine specifically for hard cases like this one. Smoke testing has been a trusted way to find breaches in plumbing and sewer systems for years, but the smoke bombs traditionally used for the job have become difficult to source since a manufacturer plant fire and closure. FogTrace solves that problem with a high-density, non-toxic fog that does the same diagnostic job: introduce it into the plumbing system and watch for where it escapes.
Fog surfacing near an A/C vent, the first visible clue that pointed the team toward the source.
Reaching the source meant climbing through a tight, difficult section of attic above the addition. What the team found there explained four years of confusion in one look.
A vent that was never finished, and a duct that made it worse
When the addition was built, the kitchen plumbing vent had never been extended through the new roof. Instead, it simply ended inside the attic of the addition, releasing sewer gas directly into that enclosed space.
An HVAC duct in that same area had been pushed up against the plumbing vent, and the vent had actually punctured the ductwork. That created a direct path for sewer gas to enter the home's air conditioning system, which then carried the smell to different rooms depending on which vents were running. It explained the kitchen one day, the master bedroom the next, and nothing at all when the system was off.
The kitchen vent pipe, found ending in the attic insulation instead of running through the roof as it should have.
Fixing the source, not just the symptom
- Corrected the plumbing vent so sewer gas could no longer discharge into the attic space
- Flagged the punctured HVAC ductwork for replacement, since duct repair falls outside our scope and a proper fix meant new ductwork rather than a patch
- Followed up with the homeowners over the following two weeks to confirm the smell was gone for good, not just masked in the short term
Verified result
Nearly two weeks after the repair, the homeowners confirmed on multiple follow-ups that the sewer smell has not returned. After four years of an odor with no clear source, the fix was permanent and confirmed, not assumed.
Chasing a smell you can't pin down?
If your home or business in Gilbert or the surrounding areas has an odor, or slow drains, a FogTrace smoke test can find the real source in one visit.