Mice Control in Waterloo Region
House mice slip through gaps the size of a dime and reproduce fast. Harnet uses an inspection-first approach — trap, seal and prevent — so mice don't just leave, they can't come back.
Homeowners, cottagers, restaurant operators, warehouse managers and property managers across Waterloo Region hearing scratching in the walls, spotting droppings, or seeing chewed food packaging or wiring.
House mice are the most common rodent in Ontario homes — and one of the most damaging. A single pair can produce dozens of offspring in a season, contaminate stored food, chew through wiring, and leave droppings that trigger allergies and asthma.
Harnet Pest Control treats mice with a structured, inspection-first program across Kitchener, Waterloo, Cambridge, Guelph and surrounding communities. We don't just drop a couple of snap traps and call it done — we identify how the mice are getting in, where they're travelling and what they're feeding on, then build a program around that.
Every mouse job is handled by a Licensed Ontario Pesticide Applicator, and every treatment is designed to remove the current population and reduce the chance of re-entry.
How to know you have a mice problem
- Small dark droppings (rice-grain size) in cupboards, drawers or basements
- Scratching or scurrying in walls or ceilings at night
- Chewed food packaging, wiring or insulation
- Greasy rub marks along baseboards and beams
- Nesting material — shredded paper, fabric or insulation
- A musky ammonia-like odour in enclosed spaces
Safe & Licensed Treatment
Bait is placed only in tamper-resistant stations and inaccessible voids. All products are Health Canada registered and applied according to label directions by a Licensed Ontario Pesticide Applicator, keeping children and pets in mind.
- Licensed Ontario Pesticide Applicator — owner-operated and fully insured
- Health Canada registered products applied according to label directions
- Local Waterloo Region service — Kitchener, Waterloo, Cambridge, Guelph & surrounding communities
- Honest quotes, no long-term contracts, warranty follow-up when applicable
Why professional mice treatment matters
Mice are neophobic — they're cautious around new objects in their environment, including traps and bait stations. Placement, product selection and timing matter more than most people realize.
Consumer bait products used incorrectly can end up killing non-target wildlife or being carried into inaccessible voids where dead mice cause odour and secondary pest problems. Professional treatment uses tamper-resistant stations placed on active runways, monitored across multiple visits.
A proper mouse program also includes exclusion recommendations — identifying the exact gaps mice are using to enter — because without sealing entry points, new mice replace the ones you remove.
How Harnet treats mice problems
Full Inspection
We identify activity zones, entry points and food/water sources inside and outside the building.
Trapping & Baiting
Strategically placed snap traps and tamper-resistant bait stations where mice actually travel.
Exclusion & Sealing Advice
We identify gaps, vents and pipe penetrations that need sealing to keep new mice out.
Follow-up Monitoring
We return to check stations, remove captures and verify the property is mouse-free.
How to prevent mices from coming back
- Seal gaps around dryer vents, AC lines, gas meters and utility penetrations with copper mesh and sealant
- Store pet food, birdseed and dry goods in sealed metal or hard plastic containers
- Keep firewood, compost and long grass away from the foundation
- Trim tree branches away from the roofline — mice climb
- Replace worn weatherstripping under garage and exterior doors
- Address moisture issues — mice, like most pests, follow water
Local relevance in Waterloo Region
Mice are the number-one rodent call across Waterloo Region, particularly in fall as temperatures drop and mice move indoors. In Guelph and Kitchener we see this most in older neighbourhoods with mature trees and stone foundations, and in newer subdivisions with attached garages that connect directly to the living space.
In Cambridge and rural areas around Ayr, Baden and New Hamburg, field mice and deer mice add to the mix — especially in properties near open fields or ravines. Our exclusion-first approach is designed for exactly these environments.
Mice control questions
Other pests we treat across Waterloo Region
Ready to end your mice problem?
Get a fast, honest quote from a Licensed Ontario Pesticide Applicator serving Waterloo Region.