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What Ontario's cosmetic pesticide ban means for pest control around your Kitchener home
In 2009 Ontario banned many pesticides for cosmetic use on lawns and gardens, and the rule confuses people because it does not stop pest control. It changes what can be used where, and who can use it.
Last updated September 25, 2026 · Reviewed by the Kitchener Exterminator team
What the ban covers
Under the Pesticides Act and Ontario Regulation 63/09, you cannot use certain pesticides to kill weeds and insects on lawns, vegetable and ornamental gardens, patios, driveways, parks and schoolyards. The province lists 2,4-D, diazinon and glyphosate among the banned active ingredients for those uses.
What is allowed for cosmetic use is a short list of lower-risk active ingredients, the Allowable List. The province describes these as having a non-toxic mode of action and not persisting in the environment, and gives examples such as borax, corn gluten meal, soap and sulphur, along with microbial and biochemical products.
In practice this is why the dandelion sprays and grub killers of thirty years ago are gone from Kitchener hardware store shelves, and why weed control on a Forest Heights front lawn now looks different from the way it did.
The exceptions that matter for pest control
The Act sets out exceptions to the ban. The two that matter most around a house are:
- Health or safety. The province allows pesticides for controlling animals that bite, sting, are venomous or carry disease. Its homeowner guidance names wasps and mosquitoes, fleas or ticks that bite pets, and rodents that may spread diseases.
- Structural extermination. Uses integral to a structural extermination are exempt. The province's guidance mentions indoor pests, rodents and pests that can cause structural damage to the home.
There is also a narrow exception for plants that are poisonous to the touch, such as poison ivy and giant hogweed, limited to ready-to-use products containing only glyphosate or glufosinate ammonium and labelled for that purpose. Agriculture, forestry and golf courses have their own exceptions, which is why a farm field in Breslau may be treated with products you cannot use on a lawn in town.
What this means for common Kitchener pest problems
- Wasps and yellowjackets. A nest in a soffit in Stanley Park or a ground nest by a patio fits the health and safety exception, because wasps sting. See wasp and hornet nest removal.
- Mice and rats. Rodent control, indoors and in exterior bait stations, sits under the rodent and structural exceptions. See mice and rat control.
- Ants inside the house. An ant trail in the kitchen is an indoor pest. Carpenter ants damaging wood are a structural pest. See cockroach and ant treatment.
- Ants in the lawn or between patio stones. This is where people get caught. Treating an ant hill in the grass or on a patio just because it looks untidy is the kind of cosmetic use the ban is aimed at.
- Spiders and earwigs. Whether an outdoor treatment fits an exception depends on the pest, where it is and what it is doing. On damp lots near the Grand River and Schneider Creek, a foundation perimeter treatment is planned around the building rather than across the garden, and the reasoning goes in the written plan.
What a homeowner can buy and use
Ontario sorts pesticides into classes. Homeowners can buy Class D domestic products for use at home, following the label. Class C commercial products can only be used by trained people, including licensed exterminators and permit holders. That is one reason a technician can do things a homeowner cannot, and why the product a technician uses is named on the written plan.
A few ground rules keep you on the right side of the law and the label:
- Read the whole label before you buy. The label says where the product may be used and on which pests, and using it anywhere else is off-label.
- Do not use an exception as a loophole. An insecticide bought for a wasp nest does not become legal for a lawn.
- Store products locked away from children and pets, in their original containers.
- Never put leftover pesticides in the garbage or pour them down a drain or storm sewer. Take them to a household hazardous waste drop-off; the province points residents to the Make the Drop program to find one.
Why the ban does not mean doing nothing outdoors
Many outdoor problems are better solved without a pesticide anyway. Ants that nest under patio stones are usually following moisture and loose sand, so relevelling the stones and fixing a downspout that drains onto them does more than any spray. Earwigs and spiders around a foundation respond to less mulch against the siding, trimmed shrubs and lights that do not pull insects to the door. Mice are kept out by sealing gaps, not by treating the lawn. A good technician will tell you where a change to the property does the job on its own.
Reporting a problem
If you see a banned product being used for cosmetic purposes, the province asks that it be reported to the local Ministry of the Environment, Conservation and Parks office, or after hours to the Pollution Hotline at 1-866-663-8477.
How this shapes a treatment plan
Because the first visit is an inspection, the technician can identify the pest, decide whether the job falls under an exception, and choose a product and method that suit it. Everything applied, and where, is written into the plan before the work starts. For planning ranges on one-visit jobs and seasonal perimeter programs, see the Kitchener pest control cost guide. To book an inspection, use the contact page.