Fruit Fly and Drain Fly Control in York Region

Kitchen flies are a source problem, not a spraying problem. Fruit flies breed in fermenting produce, spills, and the film inside a recycling bin; drain flies breed in the organic sludge coating your sink and floor drains. Find that one breeding site, remove it, and the flies are gone in a few days. Spray the air and leave the source alone and you kill the flies you can see while the next batch hatches behind you. This page tells you how to tell the two apart, how to hunt down the source in your own York Region kitchen, and the honest short list of times a Markham or Richmond Hill home or restaurant actually needs a pro.

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What is the difference between fruit flies and drain flies?

Fruit flies are tan or brown with red eyes and hover around fruit bowls, the green bin, and open drinks. Drain flies are darker, fuzzy, and shaped like tiny moths, and they sit dead still on the wall right beside a drain. People mix them up constantly because both show up in the same kitchen in the same warm weeks, but they breed in different places, so the fix is different for each. Get the identification right before you do anything else, because chasing the wrong source is exactly why a fly problem drags on for weeks.

Fruit flies breed in food. Drain flies breed in the drain. Kill the breeding site and the adults die off on their own.

The fastest way to tell them apart is to watch where they rest. Fruit flies swarm and hover over ripe or fermenting food; drain flies barely fly, land on vertical surfaces near a drain, and leave a dark smudge if you squash one. If they are moth-like and stuck to the wall or backsplash, you have drain flies, and no amount of throwing out fruit will touch them.

Where do fruit flies come from if I have no fruit on the counter?

Fruit flies come from anything fermenting, not just a fruit bowl. The forgotten onion or potato at the back of the pantry, a splash of wine or beer left in a recycling bottle, the sticky film under the toaster, a damp mop head in the laundry room, the sludge in the bottom of a green bin, an unrinsed pop can, even the wet soil of an overwatered houseplant. They breed in the yeast of fermentation and run a full egg-to-adult cycle in about a week at a warm York Region summer kitchen temperature, so a single overripe banana skin in the bin keeps a swarm topped up. Here is the part most exterminators skip: if you have fruit flies, there is a fermenting source in that room, and removing it is the whole job.

How do I find the source in my kitchen?

Work through the kitchen in this order and remove what you find:

1. Produce. Check every potato, onion, tomato, and piece of fruit, including the ones at the back of a cupboard or the bottom of a basket. Throw out anything soft, bruised, or sprouting.
2. Bins. Empty and rinse the garbage, the blue recycling, and the green organics bin. York Region collects organics weekly, but a green bin sits warm under the sink between pickups and the liquid pooling in the bottom and lid rim is a breeding site on its own. Wash it, do not just re-line it.
3. Spills and residue. Wipe under and behind the toaster, microwave, fridge, and small appliances, and look for a sticky drip running down the side of a cabinet.
4. Wet items. A damp mop, a sponge, a wet dishcloth, and a recycling bag with juice in it all breed flies. Dry them or bin them.
5. Drinks and houseplants. Rinse every bottle, can, and glass before it goes in the bin, and let overwatered plant soil dry out, since it grows near-identical fungus gnats.

Remove the source and the visible adults die off within a few days on their own. A bowl of apple cider vinegar with a drop of dish soap, covered with pierced plastic wrap, traps the stragglers while the cleanup does the real work. The trap is not the cure. The cleanup is.

How do I stop drain flies?

Drain flies stop when you clean the organic film inside the drain they are breeding in, not by pouring bleach down it. The larvae live in the gelatinous gunk coating the pipe wall just below the drain opening, and bleach runs straight past it without touching the film. Physically scrub the drain with a stiff bottle brush, then use an enzyme or biological drain cleaner that digests the organic matter the larvae feed on. Repeat over several days, because the cleaner needs contact time to break the film down.

To confirm which drain is the source, run the tape test: lay a strip of clear packing tape sticky-side-down across the drain opening overnight, leaving a small gap so air still moves. In the morning, any adults that hatched and tried to fly out are stuck to the tape. The drain with flies on it is your breeding site. Test the kitchen sink, the bathroom sinks, the floor drain in a finished basement or laundry room, and any rarely-used drain in one of those large Markham, Vaughan, or Richmond Hill homes where a basement wet-bar or bathroom sink sits unused for weeks and the film builds up undisturbed.

Can I get rid of them myself, or do I need a pro?

Most home fruit fly and drain fly problems you can solve yourself in a few days by finding and removing the source, because that genuinely is all it takes. Call a professional when the source stays hidden after a thorough search, when the flies keep coming back after you have cleaned everything you can reach, when the breeding site is inside the drain line or under equipment you cannot move, or when it is a commercial kitchen with a York Region Public Health inspection on the line. In those cases we locate the source, treat the breeding sites directly with drain treatments and biological cleaners, and reach for a Health Canada PMRA-registered product only where one is actually warranted. Inspection is free, and if the fix is sanitation and you do not need us, we will tell you and leave. That no-upsell posture is the point.

Why York Region kitchens see this so often

The dense restaurant corridors along Highway 7 through Markham and Richmond Hill, and the food courts around Pacific Mall, are the hardest cases, because floor drains, grease traps, and high summer volume give kitchen flies constant breeding sites, and a single missed drain keeps a health inspector's fly count up. The condo garbage and recycling rooms in the Vaughan Metropolitan Centre and the Richmond Hill towers are the residential version: one warm shared bin room can seed flies through a whole floor. And in an ordinary detached home in Aurora, Newmarket, or Woodbridge, summer produce ripens fast on the counter and the green bin sits warm under the sink. The pattern never changes: a source is breeding them, and closing it ends it.

For a restaurant or food-service kitchen, our commercial pest control program covers drains, traps, and the documentation a York Region Public Health inspection asks for. If the flies come alongside roaches, that is the other kitchen pest with a moisture-and-food source, and the cockroach control page covers it. Pricing for any treatment is on the cost page.

By town: kitchen flies in Markham, Richmond Hill, Vaughan, Newmarket and Aurora

Fruit flies and drain flies follow the breeding source, so restaurants and food plants see them year round and homes mostly in late summer and fall.

• Markham: the restaurant strip and food shops along Highway 7, and recycling bins in the Markham Centre condos.
• Richmond Hill: restaurants along Yonge Street, and condo garbage and recycling rooms in the Yonge corridor towers.
• Vaughan: food processing and distribution in Concord, where fly control at the docks is part of a scheduled program, and basement floor drains in large homes.
• Newmarket: restaurants near Main Street, and floor drains in the older basements near the core.
• Aurora: restaurants in the Yonge and Wellington core, and basement floor drains and laundry sinks in older homes.

Common questions

Reviewed October 2026.

(888) 885-3070