How to Stop Drain Flies | With The Sewer Assassin System — The Complete Sewer Assassin System
Because of their persistence, drain flies are among the most frustrating pests for both property owners and pest control professionals. As a result, they often require consistent maintenance and specialized treatment to achieve long-term control. Moreover, these pests don’t just come from “dirty drains.” Instead, they thrive in plumbing, organic buildup, and moisture pockets deep within plumbing lines. Therefore, if you truly want to learn how to stop drain flies, you must go beyond sanitation, foam, and surface treatments. Ultimately, lasting results come from addressing the root of the problem deep inside the plumbing system itself. In the end, this proactive approach ensures both prevention and long-term control.
Step 1: The First Line of Defense — Sewer Assassin Pest Strip Holder with Nuvan®
The fight against drain flies begins with the Sewer Assassin Pest Strip Holder, designed for use in clean-outs, floor drains, and other plumbing access points. When paired with Nuvan® pest strips, it releases a controlled vapor that penetrates deep into the system, targeting adult drain flies and larvae inside the plumbing. As a result, this gives the PMP longer-lasting and more effective control. Moreover, it allows you to be proactive instead of reactive — ultimately, delivering a powerful first strike in the drain fly control process.
Step 2: Sanitation and Treatment — Eliminate the Breeding Grounds
Drain fly larvae thrive in the gelatinous organic matter that builds up along pipe walls and in traps. Once vapor control is established, physical cleaning and targeted treatments are essential.
Using foaming bio-cleaners, microbial digester products, or dust applications (through Sewer Assassin’s removable plug system), professionals can break down that breeding matrix and eliminate the source.
In multi-drain systems, this step ensures the problem doesn’t migrate from one drain to another — a common oversight in commercial and food-service accounts.
Step 3: Detect Hidden Breaches with FogTrace™
When sanitation and treatment don’t fully solve the issue, it’s a sign the plumbing may be compromised — and that’s where FogTrace™ becomes invaluable.
The FogTrace™ system pushes a non-toxic, dense fog through the plumbing lines, allowing pest professionals to see exactly where cracks, faulty connections, broken or dry traps, cross-connections, or open lines exist. These unseen breaks are often the entry points that let drain flies (and other pests) enter from main sewer systems into the building.
Once identified, these defects can be repaired or sealed, eliminating the problem at its source.
Bringing It All Together
The Sewer Assassin™ system, combined with FogTrace™, provides a complete, professional-grade solution to drain fly infestations — from killing and preventing activity to uncovering the plumbing failures that cause recurring issues.
It’s not just pest control — it’s plumbing-based pest elimination, designed specifically for the real-world conditions professionals face every day.
Do you want the best tools for getting rid of drain flies fast?
Shop the Sewer Assassin System products today!
How to Get Rid of Drain Flies
1. What is the fastest way to get rid of drain flies?
The fastest way to eliminate drain flies for good is sanitation, drain cleaning, foam treatments, and to treat the problem inside your plumbing system using the Sewer Assassin Pest Strip Holder for use with Nuvan ProStrips®, which releases vapor to kill adult flies and larvae deep within pipes.
2. Why do drain flies keep coming back after cleaning drains?
Drain flies return because standard cleaning and treatments only reach the surface. They thrive in organic matter deep inside plumbing and sewer lines, which must be treated directly to stop recurring infestations for good.
3. How does the Sewer Assassin System stop drain flies at the source?
The Sewer Assassin System targets drain flies where they live — inside the plumbing system. It combines vapor control, and inspection tools like FogTrace™ to kill pests and identify cracks or leaks that allow re-entry.
4. Can I use the Sewer Assassin System in commercial kitchens or restrooms?
Yes. It’s designed for multi-drain environments such as restaurants, restrooms, and food-service facilities where recurring drain fly infestations are common.
5. Is the Sewer Assassin System safe for plumbing and indoor use?
Yes. All components are engineered for professional-grade use and are safe for plumbing systems when installed and maintained according to directions.