Mosquito questions, answered
Does NJ Spray for Mosquitoes?
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Who does the spraying in New Jersey?
Every one of New Jersey’s 21 counties runs its own mosquito control program. Most are county mosquito control commissions or departments, funded locally and staffed year round, with extra crews hired for the April to October season. They trap and count mosquitoes, test them for West Nile virus and Eastern equine encephalitis, and treat breeding sites before adult mosquitoes emerge.
The New Jersey Department of Environmental Protection oversees the whole system through its Office of Mosquito Control Coordination. Pesticide applications for mosquito control must follow N.J.A.C. Title 7, Chapter 30, the state’s pesticide rules. That means county programs cannot just spray wherever they want. Treatments are tied to surveillance data, and the products and methods they use are reviewed at the state level.
If you want to know who handles your town, look up your county’s mosquito control commission or department. Each one publishes its own plans and contact information.
What the trucks are actually spraying
When counties spray for adult mosquitoes, they use a method called ultra-low volume, or ULV, application. A truck-mounted sprayer puts out an extremely fine mist of insecticide as it drives slowly through neighborhoods. The droplets are sized to hit flying mosquitoes while using very small amounts of product per acre.
The products vary by county and year. In 2026, Bergen County listed four adulticides for its program: Duet, which contains sumithrin and prallethrin; Fyfanon, which uses malathion; Zenivex, based on etofenprox; and ReMoa Tri, a mix of abamectin and fenpropathrin. All are EPA-registered products approved for mosquito control.
Counties also treat water where mosquitoes breed, a practice called larviciding. Crews apply bacterial products like Bti or mineral-oil films to standing water to stop larvae before they become biting adults. Larviciding is the backbone of most programs, since it stops mosquitoes before they ever take flight.
When and where the spraying happens
County spraying is driven by surveillance, not the calendar. Crews set traps, count mosquitoes, and test them for disease. When trap counts spike or mosquitoes test positive for West Nile virus, the county schedules adulticide treatments in the affected areas. In September 2026, for example, Monmouth County sprayed parts of Manasquan after mosquitoes there tested positive for West Nile.
Spraying almost always happens overnight, typically between 1 and 6 in the morning. Bergen County runs its program from April 30 through October 31, spraying towns like Mahwah, Teaneck, and Hackensack in the 3 to 6 a.m. window. Camden County sprayed seven towns in a single July night between 1 and 5 a.m.
State law requires counties to post notice of spraying on their websites at least 12 hours before it starts, and applications must be done before dawn or after dusk. Check your county mosquito control website for the current schedule and sign up for alerts if they offer them.
What county spraying cannot do for your yard
County spraying is built for streets and neighborhoods, not your backyard. The ULV mist from a truck drifts over roads and open areas, but it does not push deep into the dense shrubs, hedges, and shady corners where mosquitoes spend their days. A mosquito resting under your deck never meets a droplet.
The effect is also short lived. A spray night knocks down the adults flying that night, but new mosquitoes keep emerging from standing water nearby. If your yard has clogged gutters, a kiddie pool, or saucers under flower pots, you are manufacturing fresh mosquitoes all week long.
That gap is exactly where a company like Bite Back fits. While the county handles the big picture, our technicians treat the vegetation and resting sites on your specific property, the places the truck mist never reaches. County spraying plus a treated yard is the combination that actually lets you enjoy summer evenings.
How to stay informed and protect your family
Start with your county mosquito control website. Schedules, spray maps, and product fact sheets are posted there, and many counties offer email or text alerts before spray nights. The NJDEP Office of Mosquito Control Coordination at 609-292-3649 can point you to your county program if you are not sure where to look.
On spray nights, the standard advice is simple. Close your windows, bring pet bowls and toys inside, and cover vegetable gardens. The products break down quickly outdoors, and by morning the application is over.
Beekeepers get extra protection under state law. If you keep bees, register your apiary with the New Jersey Department of Agriculture. County commissions must notify registered beekeepers at least 24 hours before spraying within three miles of their hives. If you have health concerns about spraying, call your county program directly and ask what options they offer.
Quick answers
Does NJ spray for mosquitoes?
Yes. All 21 New Jersey counties run mosquito control programs, and most use truck-mounted ULV sprayers to treat adult mosquitoes during the summer, usually between 1 and 6 a.m. Treatments target areas where trap counts are high or mosquitoes test positive for West Nile virus. The NJDEP regulates every application under the state's pesticide rules.
Is mosquito spraying in NJ safe for people and pets?
The products counties use are EPA-registered and applied at very low volumes, and the NJDEP oversees every program. Risk to people and pets is considered minimal when applications follow the label. Still, on spray nights it is smart to close windows, bring pet bowls and toys indoors, and cover garden vegetables. By morning, the application is finished and residues break down quickly.
How do I find out when my street will be sprayed?
Check your county mosquito control website, where spray schedules and maps must be posted at least 12 hours before treatment. Many counties also offer email or text alerts. Spraying usually happens between 1 and 6 a.m., so most residents sleep through it. If you cannot find your county's schedule, the NJDEP Office of Mosquito Control Coordination at 609-292-3649 can direct you.
Do I still need mosquito control at home if the county sprays?
Yes, if you want real relief in your yard. County spraying covers streets and open areas with a short-lived mist that does not reach the shrubs and shady spots where mosquitoes rest on your property. Dumping standing water weekly and treating your yard's vegetation, either yourself or with a professional service, is what makes evenings bite-free.
County spraying covers the street. We cover your yard.
County trucks do important work, but they drive past your property line. Bite Back treats the shrubs, shady spots, and water edges where mosquitoes actually rest and breed on your land, so your yard stays comfortable between spray nights. Get a free quote and take your summer evenings back.
Serving backyards across New Jersey.
Main photo via Pexels
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