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Drain Fly Identification and Control in Utah

Correct identification is an important first step in pest control.


Drain flies are small, only about 1/8th of an inch long. They are very hairy and their wings are covered in fine hairs-almost moth like.

Drain flies develop in the scum lining drains and sewer lines or in decaying organic material. Larvae hide behind the scum, so treatments like boiling water, pesticides or other chemicals are ineffective. They can breed around broken pipes/drains beneath slabs or in crawl spaces. They can also enter buildings through floor cracks, etc.

Need help controlling flies?

Thorn Pest Services Identify the pest with our Drain Fly gallery

Where do they lay their eggs
Where do they lay their eggs

Drain flies lay their eggs in scum lining drains and sewer lines or in decaying organic material. Larvae hide behind this scum.

Our drain cleaning services can help eliminate this problem.


Psychoda phalaenoides




Yes, they are attracted to light

Thorn Pest Services Tips for keeping drain flies away

How To Prevent Flies From Entering Your Home
Pest control experts
  • If flies are coming from voids, crawl spaces or slabs, fix the moisture issue causing the problem and seal.

How To Get Rid Of Flies Around Your Home
Pest control experts
  • Locate the breeding site and remove, if possible.

  • Remove larval habitat by using a hard bristle brush to remove the scum film from inside drains.

  • Use an enzyme drain cleanser to maintain drains free of organic film.

Don't let flies take over.
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Thorn Pest Solutions

How thorn can help

Pests can be difficult to control, but that’s what we are here for. We create a strategic plan to gain control of your problem and make sure we get results.

Thorn's Approach

We take a scientific approach to pest control. We start with an inspection and assessment to help us identify the pest, locate where they are, and create a specific plan for your property. Every home and business is different and requires a unique strategy.

Black Beetle. Thorn Diagram.

Thorn Pest Services

Driven by science.
Led by service.

Proper pest management starts with a detailed inspection and assessment from an expert pest professional before treatment. Thorn Pest Solutions uses a three-step process rooted in science to eliminate pests with long-term results.

Assess Situation

First, we identify the root problem(s) with a site assessment. Pests are almost always an indicator of an environmental condition. This will determine the best actions to provide short and your long-term results against pests.

Execute Action Plan

Next, we develop a plan to fix the problems we discovered. This includes solving current pest issues, eliminating conducive conditions, and monitoring for future pest activity. Good pest management starts with a good plan.

Track Success

Lastly, we implement the solutions we developed including inspection, monitoring, and preventing future pest infestations. Good pest control requires a good offense and not just defense. Prevention is key.

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