How to Keep Your Workplace Rodent-Free

Close up of rat

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Pests in the workplace have been linked with asthma, rabies, and Lyme disease. One of the most common workplace pests, rodents (including rats, mice, and squirrels), are responsible for the spread of several viruses and parasites. By eliminating their sources of food, water, and shelter, you can stress the pests and create an environment where they don't want to stay.

How do you know if your workplace has rodents, and what steps can you take to make sure they leave and do not come back?

Signs of Infestations

The most common sign of a rodent infestation is actually seeing a mouse or rat, alive or dead. Other than actually seeing a rodent on the premises, the next most common sign that rodents have invaded the worksite is seeing their droppings. These will be found near food sources in cupboards, drawers or bins where food is stored, overhead in attics or drop ceilings, or on pathways such as wall studs or beams. A good place to look in the desk drawers of employees who bring in and keep food in their desks. Mice and rats love to find these often-overlooked areas!

Gnawed or nibbled food and/or its packaging is another sign of rodents, as is gnawing around holes or gaps in the wood of the building, indicating that some rodent has made its way into the workplace.

Prevention and Control

Once you have confirmed that rodents are in your workplace, you can take the following steps to make the uninvited guests leave.

  • Dry up rodent water sources by repairing leaky faucets or pipes indoors and outdoors by eliminating bird feeders and bird baths.
  • Secure rubbish, especially food waste, in metal or hard plastic containers that can resist gnawing.
  • Do not leave cakes and cookies, or other employee-shared snacks, out overnight, as these can be highly attractive to the rodents and other pests.
  • Decrease natural food sources near the property by gathering any tree fruit and nuts promptly when they fall to the ground.
  • Inspect building openings and utility entries for cracks of 1/4-inch or larger.
  • Seal any cracks with concrete, mortar, steel wool or metal flashing.
  • Mount storage sheds on concrete slabs to discourage tunneling.
  • Prune ​shrubs so that six inches of the ground below is visible and trim the height of ground covers to one foot or less.
  • Cut back vines hanging on buildings and tree limbs overhanging roofs to eliminate overhead building entries.
  • Ask employees to keep any food in the kitchen rather than in their desk drawers, or store and food at their desks in pest-resistant, un-gnawable containers.
  • Keep an eye out for signs of re-invasion and continue to manage all the above.