Stars and Bars RestorationWe get some version of this call a lot: "We had the fire damage cleaned up months ago, but the smoke smell keeps coming back." Or, "We had a sewage backup, everything got cleaned, but the basement still smells wrong every time it rains." Almost every time, the answer is the same — whoever did the original work masked the smell instead of actually removing what was causing it. That's exactly the gap the IICRC's Odor Control Technician (OCT) certification exists to close, and it's worth explaining because most homeowners have never heard of it.
Odor Isn't a Smell Problem — It's a Contamination Problem
This is the core idea behind OCT training, and it changes how you think about odor entirely. A bad smell after fire, sewage, or mold damage isn't really the problem itself — it's a symptom of contamination that's still physically present somewhere in the structure. Smoke odor comes from microscopic soot particles embedded in porous materials like drywall, insulation, and subflooring. Sewage odor comes from bacteria and organic contamination that soaked into flooring, wall cavities, or the wood framing itself. Musty mold odor comes from microbial volatile organic compounds (MVOCs) being actively produced by mold colonies that are still growing somewhere out of sight.
Spray an air freshener or run an ozone machine over any of that, and you might not smell it for a few days. But the source is still there, and the smell comes back — often worse, and often confusing everyone involved because "it was already cleaned."
What OCT Certification Actually Trains Technicians to Do
The IICRC's OCT course (usually built on top of the foundational WRT, FSRT, or AMRT certifications we've written about before) trains technicians in a specific, methodical approach:
Source identification first. Before any deodorizing product touches a surface, an OCT-trained technician is trained to find where the odor is actually coming from — which wall cavity, which section of subfloor, which piece of ductwork — rather than treating the whole room as one generic problem.
Matching the removal method to the contamination type. Smoke odor, sewage odor, and mold odor each require different chemistry and different equipment. A technician trained in OCT knows the difference between thermal fogging (used for smoke odor because it mimics how the smoke penetrated in the first place), hydroxyl generators (safer for occupied spaces than ozone), and enzymatic treatments (used specifically for organic and biological odors like sewage or pet contamination).
Sealing and encapsulation when removal alone isn't enough. Sometimes a material has absorbed contamination so deeply that full odor removal isn't realistic without demolition. In those cases, OCT training covers when and how to properly seal a surface with an odor-blocking encapsulant — a very different (and more honest) approach than just spraying something that smells nice over the top.
Verification, not guesswork. Properly trained technicians confirm the odor source is actually gone before calling a job finished, instead of relying on "it smells fine right now" — which, as anyone who's had odor come back after the first cleanup already knows, isn't the same thing as actually gone.
Why This Matters More Than People Expect
We've walked into more than one Pueblo or Colorado Springs home where a previous cleanup crew ran an ozone machine for a day, called it done, and moved on. The homeowner felt reassured for a week or two, then the smell crept back — usually because the actual contaminated material was never removed, just temporarily overwhelmed by a stronger smell.
This isn't a minor inconvenience. Lingering odor after a fire, sewage backup, or mold remediation is one of the most common reasons we hear from homeowners who feel like they got shortchanged on their original restoration work, sometimes paid for out of an insurance claim that's now closed. It's also a real problem if you're trying to sell a house — buyers and inspectors notice smoke and mildew odors fast, and it can tank a sale or a home inspection even after "the damage was fixed."
How This Connects to the Rest of Restoration Work
Odor control rarely stands alone — it's almost always the final step after the actual water extraction, fire and smoke cleanup, or sewage remediation is finished. We've written about the certifications that cover those earlier stages: our FSRT certification explainer covers fire and smoke restoration specifically, our AMRT certification piece covers microbial remediation, and our WRT-ASD certification explainer covers water damage and applied structural drying. OCT is the layer that comes after those, specifically targeting what's left behind when the visible damage is gone but the smell isn't.
If you're evaluating a restoration company for smoke, sewage, or mold odor — whether that's for a job we're bidding on or one of our competitors — it's a fair question to ask directly: "Is your technician OCT certified, or are we just getting an air freshener treatment?" It's one of the questions we suggested in our questions to ask before hiring a restoration company post, and odor control is exactly the kind of service where the gap between "properly trained" and "not" shows up fastest — usually a couple of weeks after the invoice is paid.
What We Do Differently
Stars & Bars is IICRC-certified across water, fire, and mold restoration, and odor control is something we build into the job rather than treat as an afterthought. When we're finishing a fire and smoke job, a sewage cleanup, or a mold remediation anywhere from Pueblo to Colorado Springs to Trinidad, part of our process is confirming the actual source of any lingering odor is gone — not just masked — before we consider the job complete.
We're a veteran-owned company (our founder Robert served in the Marine Corps), and we built our process around doing the job right the first time, because we've seen too many homeowners pay twice for the same problem after a rushed cleanup.
If you've got a smell that keeps coming back after a fire, flood, or sewage backup — even one that "already got cleaned" by someone else — give us a call at (719) 676-2456. We'll walk through what's actually going on, and if it turns out the original job just needs proper odor source removal rather than a whole new remediation, we'll tell you that too. Same number for emergencies: (719) 676-2456, 24/7.