18-25 cm – Greyish brown
Rodent – High risk
Norway Rat
The Norway rat (Rattus norvegicus), also known as the brown rat or sewer rat, is the most problematic rodent for homes in Quebec. An excellent burrower, it digs complex galleries under foundations and can cause major damage to structures, electrical cables and plumbing. It is also a major health hazard.
§1Distinctive features
How to identify it
Large rodent, 18 to 25 cm long with a 15 to 20 cm tail. Grayish-brown coat on back, lighter under belly. Rounded muzzle, small ears. Larger and more robust than the black rat.
§2Habitat
Where to find it
It lives in sewers, under foundations, in compost heaps, under terraces and in basements. It prefers the lower levels of buildings and underground areas.
§3Reproduction
Lifecycle
Without intervention, an infestation can double in size in just a few weeks.
§4What to look out for
Signs of infestation
- Elongated droppings (1-2 cm) along walls and in closets
- Corrosion marks on cables, packaging and structures
- Paw prints in dust and dirt
- Scraping and running noises in walls or ceilings at night
- Strong, musky urine odor
§5Why act fast
Risks
- Disease transmission: leptospirosis, salmonellosis, hantavirus
- Damage to electrical cables (fire hazard)
- Food and surface contamination
- Structural damage (foundations, piping)
- Spread of fleas and other parasites
§6Prevention
How to avoid it
- Close food containers tightly
- Eliminate sources of stagnant water
- Plug any opening greater than 6 mm in the foundation
- Keep wood and compost piles away from foundations
- Regularly clean waste garbage cans and disposal areas
§7Pro method
How MW works
Inspection
Home location and assessment.
Preparation
Customized plan – pre-intervention measurements.
Treatment
Locate main and satellite nests, treat with non-repellent baits.
Follow-up
Inspection visit – written guarantee.
§8We answer you
Frequently asked questions
How do I know if I have rats or mice?
Rats produce larger droppings (1-2 cm vs. 0.5 cm) and make more noise. Gnawing damage is also greater.
Do rats enter through sewers?
Yes, Norway rats can enter through toilets and drains in the event of heavy sewer infestations.
Can you get rid of rats on your own?
Mechanical traps can help with a few individuals, but an established infestation requires professional intervention.
React quickly, sleep well.
The longer the infestation lasts, the more expensive it becomes.