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House Flies
Musca domestica
Updated May 2026 · Boise, ID
House flies are medium-sized gray flies, about 6-7mm long, with four dark stripes running down the thorax. They have large reddish-brown eyes and sponging mouthparts (so they don't bite), plus clear w...
Quick Facts
Size6-7mm long
ColorGray with four dark stripes on thorax
Lifespan15-30 days
Active SeasonsPeak in summer, Year-round in homes
Common LocationsKitchens, Garbage areas, Near food
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Identification
How to Identify House Flies
Quick Answer
House flies are medium-sized gray flies, about 6-7mm long, with four dark stripes running down the thorax. They have large reddish-brown eyes and sponging mouthparts (so they don't bite), plus clear wings.
House flies are medium-sized gray flies, about 6-7mm long, with four dark stripes running down the thorax. They have large reddish-brown eyes and sponging mouthparts (so they don't bite), plus clear wings. They're the most common fly people find indoors across the Treasure Valley.
Behavior
House Flies Behavior & Habits
Understanding how house flies behave helps prevent infestations
House flies eat by vomiting digestive juice onto food and sucking the mix back up. That same fly may have just landed on garbage, dog waste, or a dairy lot, which is how they move bacteria onto your kitchen counter. Females lay eggs in rotting organic matter, and maggots can hatch into adults in about a week during Boise summers.
Dangers
House Flies Risks & Dangers
What house flies can do to your health and property
Health Risks
House flies are real disease vectors, not just a nuisance. They carry Salmonella, E. coli, and over 100 other pathogens picked up from manure, garbage, and animal waste. A single fly landing on a cutting board is enough to contaminate it.
Property Damage
House flies don't chew or damage your home, but a heavy indoor population almost always points to a sanitation or entry-point problem worth fixing before it gets worse.
Warning Signs
Signs of House Flies Infestation
Look for these indicators in your home
Flies buzzing around the kitchen sink, dining table, or trash can
Clusters of flies on south-facing windows or ceiling light fixtures
Maggots in the garbage can, compost bin, or pet waste outside
Dark fly specks (regurgitation and feces) on walls, blinds, and counters
A sour, rotting smell near a trash area or drain where flies linger
House Flies in Boise & the Treasure Valley
Boise summers and Treasure Valley irrigation ditches keep house fly pressure high from June through September, with peaks near dairies. Across our 2,500+ Treasure Valley homes, the worst kitchen and trash fly calls cluster in Garden City, the Boise Bench, Meridian, and along the Boise River corridor. Homes within a few miles of farms, dairies, or backyard chicken coops get hit hardest, which is why we like to start exterior barrier treatments before Memorial Day for just $49.
Our Solution
How We Eliminate House Flies
Professional treatment for complete elimination
We tackle house flies with integrated pest management: find and remove the breeding source, seal up entry points, and add a perimeter barrier so flies stop coming back. New customers start service for $49, and our quarterly plan at $119 keeps summer fly pressure down all season.
Prevention
How to Prevent House Flies
Steps you can take to reduce the risk of infestation
1
Bag your garbage and keep cans tightly sealed, especially June through September2
Pick up pet waste from the yard daily3
Cover food on the counter and don't leave dirty dishes out overnight4
Repair torn window screens and add a door sweep if light leaks under your door5
Wash out garbage cans and recycling bins every few weeks6
Move compost piles and backyard chicken coops as far from the house as you canFAQ
House Flies Questions Answered
Common questions about identification, prevention, and treatment
Why are there so many flies in my Boise kitchen?
Flies need rotting organic material to breed, so check for uncovered garbage, pet waste in the yard, compost piles close to the house, and torn window screens. In the Treasure Valley, late-summer kitchen flies often drift in from nearby farm fields, chicken coops, or dairy lots, so an outdoor barrier treatment matters as much as cleaning indoors.
Are house flies actually dangerous, or just gross?
Both. House flies carry over 100 pathogens including Salmonella and E. coli, and they spread bacteria every time they land on food, a counter, or a cutting board. They don't bite, but the contamination risk is real, especially around kids and pets in the kitchen.
Do bug zappers actually work on house flies?
Not well, and they can make things worse. Zappers pull flies in from a wider area and can spray bacteria-laden particles when they kill them, which is the last thing you want over a patio table. Sealed indoor light traps plus a Green Guard exterior barrier are a cleaner fix. Call us at (208) 297-7947 to set one up.
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