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Drain flies — also known as moth flies or sewer flies — are tiny, fuzzy-winged insects that breed in the organic buildup inside drains, pipes, and sewage systems. Though they may look harmless, a drain fly infestation can escalate quickly, turning your kitchen or bathroom into an unsanitary nuisance zone. If you have spotted clusters of small, dark flies hovering near sinks, floor drains, or toilets, it is time to act.
At Technica Pest Solutions, we specialize in fully eliminating drain fly infestations using targeted, professional-grade treatment methods — not temporary fixes.
| Warning Sign | Where to Look |
|---|---|
| Small, moth-like flies near sinks | Kitchen & bathroom drains |
| Flies resting on walls near plumbing | Walls around pipes and sewers |
| Larvae in slow or clogged drains | Inside drain pipes |
| Musty or sewage-like odour | Floor drains and utility rooms |
| Sudden spike in fly population indoors | Entire home, especially lower floors |
While drain flies do not bite, they can carry bacteria from sewage and spread contaminants onto food preparation surfaces. Their shed skins and body parts can also trigger asthma and allergies, especially in children and the elderly. A drain fly problem left untreated can rapidly spread to multiple rooms and neighbouring units in multi-family buildings.
| Treatment Method | How It Works | Best For |
|---|---|---|
| Biological Drain Treatments | Enzyme-based gels break down organic buildup where larvae breed | Mild to moderate infestations |
| Residual Chemical Sprays | Professional-grade insecticides applied to fly resting areas and entry points | Active adult fly populations |
| Drain Pipe Cleaning & Flush | Deep mechanical and chemical flush of drain pipes to eliminate breeding sites | Recurring infestations |
| Crack & Crevice Treatment | Targeted application around pipe gaps, floor drains, and utility entries | Preventing re-entry |
Drain flies breed in the thin layer of organic slime — made up of grease, hair, soap scum, and food debris — that builds up on the inner walls of drains and pipes. Even a clean-looking home can harbour this buildup inside pipes, which is why professional treatment is often necessary.
Drain flies are not known to bite humans, but they can carry and spread bacteria from sewage and decaying matter. Their body parts and shed skins can contribute to respiratory irritation, particularly for individuals with allergies or asthma.
DIY methods like boiling water or bleach may reduce the population temporarily but rarely eliminate the infestation entirely. To fully eradicate drain flies and their breeding sites, professional-grade biological treatments and pipe cleaning are typically required.
A standard treatment visit typically takes 1 to 2 hours, depending on the size of the property and the severity of the infestation. Follow-up visits may be recommended for persistent infestations to ensure complete elimination.
In most cases, treated drains can be used within a few hours after service. Your technician will provide specific post-treatment instructions based on the products used and the areas treated.
If the organic buildup in pipes is completely eliminated and preventive measures are followed, re-infestation is unlikely. We provide detailed post-treatment recommendations to help you maintain a fly-free environment long after our visit.
Yes. We provide drain fly extermination for residential homes, apartments, restaurants, hotels, and commercial properties. Our team has experience dealing with high-volume drain systems common in food service and hospitality environments.
