Drain flies breed in the slimy biofilm inside sinks, showers, and floor drains, and a swarm indoors is a sign of a hidden breeding site. Our expert drain fly control solutions locate and clear these breeding grounds quickly while providing long-term protection for your home or business.
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Drain flies (also called moth flies) are small, fuzzy, moth-like insects often mistaken for fruit flies or gnats. They have broad, hairy wings, a dark compound eye, and a stocky body covered in fine hair, and they are weak fliers usually found resting near sinks, showers, and drains rather than actively flying around fruit bowls.
Unlike fruit flies, which are drawn to ripening produce, drain flies breed in the gelatinous organic film that builds up inside drain pipes, and correctly identifying them is the first step to targeting the right breeding site.
The clearest sign of drain flies is small, fuzzy flies resting on walls, mirrors, or tiles near a sink, shower, or floor drain, especially in the morning when they are least active. You may also notice them emerging from a drain when water is run after sitting unused.
Inside the pipe itself, a dark, slimy biofilm coats the walls of the drain, and this gelatinous residue is where drain fly larvae feed and develop. A persistent, unexplained musty odour near a drain can also point to a build-up of this organic film.
We begin with a thorough inspection of sinks, showers, floor drains, and any other moisture-prone fixtures to locate every active breeding site. Rather than simply killing adult flies, our treatment targets the biofilm layer inside the pipe where larvae develop.
We apply professional-grade enzymatic and residual treatments directly into affected drains to break down organic build-up and eliminate flies at every life stage, then follow up to confirm the breeding cycle has been fully disrupted.
Keeping drains clean is the most effective way to prevent drain flies. Regularly scrub sink, shower, and floor drains with a stiff brush to remove hair, soap scum, and organic buildup before it can become a breeding ground.
Fix dripping pipes and standing water promptly, fit drains with fine mesh covers to stop adult flies entering or exiting, and consider periodic use of an enzyme-based biological drain cleaner to break down residue deep inside the pipe.
If left untreated, drain fly populations can multiply quickly because each generation develops in as little as one to two weeks in a moist, food-rich drain. Severe infestations often involve multiple drains throughout a property and can spread to nearby fixtures.
A heavy infestation is a strong indicator of significant organic build-up or a plumbing issue that needs professional attention, and DIY sprays alone rarely resolve the underlying breeding site. Our technicians identify and clear every affected drain to stop the cycle for good.
Do drain flies bite?
No. Drain flies do not bite people or pets. They are a nuisance and hygiene concern rather than a health risk, though heavy infestations can trigger allergies or asthma symptoms in sensitive individuals.
Why do I keep seeing drain flies even after cleaning?
Surface cleaning often only removes flies you can see, not the biofilm layer deep inside the pipe where larvae live. Professional treatment targets this hidden breeding site directly.
Can I get rid of drain flies myself?
DIY methods like pouring boiling water or bleach down the drain may kill some adult flies but rarely eliminate the full breeding colony. Ongoing infestations usually need a targeted enzymatic treatment.
How long does it take to get rid of drain flies?
Most infestations clear within one to two weeks of professional treatment, though heavily affected properties with multiple breeding sites may take a little longer to fully resolve.
Our drain fly control services remove active infestations and apply preventative measures to keep them from returning, giving you a clean, fly-free home or business.
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