Silver Bullet Pest ControlPreventing Gnats in the Home: What Works, and When to Call a Gnat Exterminator
Tiny flies around the fruit bowl, the sink or your houseplants? “Gnats” is the word most people use for three or four different small flies, and each one breeds somewhere different. Find the breeding spot and the gnats stop. Here is how to tell them apart, how to prevent them, and when it makes sense to bring in a professional.
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How do you prevent gnats in the home?
To prevent gnats in the home, take away the wet, fermenting or rotting material they breed in: keep ripe fruit in the fridge, rinse recycling, empty the trash often, clean the slime out of drains, and let houseplant soil dry between waterings. Traps only catch adults, so the gnats come back until the breeding spot is gone. If they keep returning after two to three weeks of that, a gnat exterminator can find the hidden source — often a drain, a leak or a broken pipe. Silver Bullet Pest Control (NJ License 90568B) gives free quotes across North Jersey; call or text 973-510-2585.
Which “gnat” do you have?
Where you see them is the biggest clue. These are the four small flies behind most gnat calls in North Jersey homes:
Fruit flies
Tan body, often red eyes. They hover around fruit bowls, trash cans, recycling bins and anywhere sugary liquid has spilled — the bottom of a soda can is enough.
Fungus gnats
Small, dark, slender and weak fliers. They walk on the soil of houseplants and drift up when you water. The larvae live in damp potting mix.
Drain flies
Fuzzy, moth-shaped and gray, with wings folded like a roof. They rest on bathroom walls and tub edges and breed in the slime film inside drains.
Phorid flies
Humpbacked flies that run in short bursts. They breed in decaying organic material — sometimes a broken drain line or a sewer leak under a floor slab.
Got flies that are bigger than a gnat? See our guide to getting rid of house flies.
Gnat identification table: where they breed and how to stop them
| Gnat | Where you see them | Where they breed | How to stop them |
|---|---|---|---|
| Fruit fly | Kitchen counters, fruit bowl, trash | Ripe fruit, spilled juice, wine, recycling, damp mops | Refrigerate produce, rinse cans and bottles, empty trash daily |
| Fungus gnat | Around houseplants and windows | Wet potting soil with organic matter | Let soil dry out, water from the bottom, repot heavily infested plants |
| Drain fly | Bathroom walls, sinks, tubs, basement floor drains | The gel-like film inside drains and traps | Scrub drains with a brush, keep rarely used drains wet |
| Phorid fly | Bathrooms, basements, near floor drains | Rotting organic matter, broken pipes, sewage leaks | Find and fix the source — often needs a professional |
Fruit flies are a topic of their own — read how to get rid of fruit flies for more detail.
Gnat prevention checklist for your home
Store ripe produce in the fridge
Bananas, tomatoes, onions and potatoes are the classic starters. One forgotten potato in a pantry bag can produce a lot of fruit flies.
Rinse anything that held a drink
Cans, bottles and juice boxes go into the recycling bin rinsed. Keep the bin lidded and wash it now and then.
Take the trash out often
Especially in summer. Wipe up drips under the can liner, where gnats like to breed unseen.
Clean drains, not just sinks
Run a stiff drain brush down sinks, tubs and floor drains once a week if you've had gnats. Hair and soap scum feed the film drain flies need.
Dry out wet spots
Sponges, mops, dish racks, pet water bowls and plant saucers all hold water. Wring, dry and empty them.
Water plants less
Most houseplants are fine if the top inch or two of soil dries between waterings. Fungus gnat larvae die in dry soil.
These habits handle most gnat problems in one or two breeding cycles. If you see gnats in a room with none of these sources, that's a sign the breeding spot is hidden.
Gnats in houseplants: how to get rid of fungus gnats
Fungus gnats are the gnat most people find hardest to shake, because the adults you see are only part of the story. The larvae live in the top couple of inches of damp potting mix, feeding on fungi and decaying plant material. As long as the soil stays wet, they keep coming.
- Let the soil dry. This one step does most of the work. Skip watering until the top inch or two is dry to the touch.
- Water from the bottom. Set the pot in a tray of water for a short while so the roots drink and the surface stays drier. Empty the tray afterward.
- Use yellow sticky cards. Stick one into each pot to catch adults and show you which plants are the problem.
- Top-dress or repot. A thin layer of coarse sand or fine gravel on top of the soil makes it harder for adults to lay eggs. Badly infested plants may need fresh potting mix.
- Check new plants. Gnats often arrive in the soil of a plant you just brought home. Keep new plants apart for a week or two.
Fungus gnats are a nuisance, not a health risk to people. Still, a heavy infestation can hurt seedlings and young roots. If you're also wondering whether your plants are attracting rodents, see are mice attracted to house plants.
Gnats coming from the drain
If the gnats are in the bathroom or near a basement floor drain, you're probably looking at drain flies. They breed in the slimy film that builds up on the inside of pipes and traps — not in the water itself. That's why pouring cleaner down the drain often doesn't work: the film stays put.
Quick test: tape a clear plastic cup upside down over the drain overnight, or cover it with tape, sticky side down. If you find small fuzzy flies stuck to it in the morning, that drain is the source.
What actually clears a drain: scrub the inside of the pipe with a long, stiff drain brush, then flush it with plenty of hot tap water. Repeat for several days. Don't count on bleach — it runs straight past the film. Floor drains, basement sinks and guest tubs that are rarely used can also dry out and let gases and flies come up; running water in them regularly helps.
Gnats and a sewer smell together? That can point to a cracked drain pipe or a sewer leak under the floor, where phorid flies breed. Cleaning won't fix that. Call a plumber to check the line, and call or text us at 973-510-2585 if the flies stay after the repair.
DIY gnat traps: what they can and can't do
| Method | Works on | Honest verdict |
|---|---|---|
| Cider vinegar + a drop of dish soap in a cup | Fruit flies | Catches adults well; does nothing about the breeding spot |
| Paper cone over a jar with a bit of overripe fruit | Fruit flies | Same idea as vinegar; good for monitoring |
| Yellow sticky cards in pots | Fungus gnats | Catches adults and shows which plants are infested |
| Letting soil dry out | Fungus gnats | The most effective step for houseplant gnats |
| Drain brush + hot water | Drain flies | Effective when repeated; pouring cleaner alone usually isn't |
| Bug zappers and room sprays | Most gnats | Kill a few adults; the next batch hatches anyway |
Think of traps as a scoreboard: if the count keeps dropping, your prevention is working. If it holds steady after two to three weeks, there's a source you haven't found.
When to call a gnat exterminator
Most gnat problems are a cleaning job. These are the times a professional visit pays off:
They keep coming back
You've cleaned, dried and trapped for two to three weeks and the numbers aren't dropping.
No obvious source
Gnats in a bedroom, closet or basement with no fruit, plants or drain nearby — something hidden is wet or rotting.
Restaurants and food businesses
Fruit flies and drain flies in a kitchen or bar can cause inspection problems. Floor drains, ice machines and soda lines are common sources.
Multi-unit buildings
In apartment buildings and two-family homes, gnats can breed in a shared line or another unit, so treating one kitchen doesn't solve it.
Food businesses can read more on restaurant pest control and commercial pest control.
What a professional gnat visit looks like
A good gnat exterminator spends most of the visit finding where the flies breed, because that's what decides the fix. When Silver Bullet Pest Control comes out for gnats or small flies, the visit usually looks like this:
- Identify the fly. Fruit fly, fungus gnat, drain fly or phorid fly — each points to a different kind of source.
- Find the breeding site. We check drains, garbage areas, under appliances, plant pots, damp basements and wall areas around leaks.
- Tell you what to clean or fix. Often the answer is a drain that needs scrubbing, a leak that needs a plumber, or produce storage that needs to change.
- Treat where it makes sense. Where a treatment will help, we use products labeled for that fly and that location, and we explain any precautions before we start.
We're based in Garfield and serve Bergen, Passaic, Essex and Hudson counties. Same-day appointments are often available. For ongoing protection against gnats, ants, roaches and other pests, ask about our recurring home pest control, which comes with a 100% satisfaction guarantee.
Get a Free Quote for Gnat Control
Tell us where you see the gnats and send a photo if you can. We'll tell you what they are and what it will take.
Why people call us about gnats
- Gnats keep coming back after weeks of traps
- Small flies in the bathroom or basement
- Fruit flies in a restaurant or bar
- Gnats with a sewer smell
- Not sure what kind of fly it is
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Gnat Questions
What causes gnats in the house?
Gnats are caused by a wet, fermenting or rotting breeding spot: ripe fruit, sugary spills, damp potting soil, the slime inside drains, or a leak. Find and remove that spot and the gnats stop, because adults only live a short time.
How long does it take to get rid of gnats?
With the breeding source removed, most gnat problems drop off within one to three weeks as the remaining eggs and larvae finish their cycle. If you still see steady numbers after three weeks, the real source probably hasn't been found yet.
Are gnats harmful to people?
Fruit flies, fungus gnats and drain flies don't bite or sting. Fruit flies and drain flies can carry germs from trash and drains onto food and counters, so they're a sanitation problem, especially in kitchens and food businesses.
Why do I have gnats in my bathroom?
Gnats in the bathroom are usually drain flies breeding in the film inside a sink, tub or shower drain. Tape over each drain overnight to find the one they come from, then scrub it with a drain brush and hot water for several days.
Does vinegar get rid of gnats?
A cup of cider vinegar with a drop of dish soap traps fruit flies, but it doesn't get rid of them by itself. It catches adults while more hatch from the fruit or spill they came from, so you still need to remove that source.
How do I get rid of gnats in my plants without killing them?
Let the top inch or two of soil dry out between waterings, water from the bottom, and use yellow sticky cards to catch adults. Fungus gnat larvae need damp soil, so drier soil breaks the cycle without hurting most houseplants.
Can bleach kill drain flies?
Bleach usually doesn't stop drain flies because it flows past the slime film they breed in. Scrubbing the inside of the pipe with a stiff drain brush and flushing with hot water works much better.
When should I call an exterminator for gnats?
Call when gnats keep coming back after two to three weeks of cleaning, when you can't find a source, when there's a sewer smell, or when it's a restaurant or apartment building. Those cases usually mean a hidden source that needs an inspection.
Do gnats come back in winter?
Fruit flies and drain flies can breed indoors all year, and houseplant gnats often get worse in winter when plants sit in damp soil near warm windows. Outdoors they slow down in the cold, but an indoor source keeps going.
Do you treat gnats in restaurants?
Yes, we handle small fly problems for food businesses in Bergen, Passaic, Essex and Hudson counties. Call or text 973-510-2585 for a free quote.
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Gnat and fly help across North Jersey
We're based in Garfield and serve Bergen, Passaic, Essex and Hudson counties.
Updated November 2026 by the Silver Bullet Pest Control team, Garfield, NJ • NJ License 90568B