Pest control in Colorado

What to know about pest control in Colorado

Colorado's pest problems follow the seasons. Miller moths get into homes in late spring, mosquitoes carry West Nile virus through the summer, and deer mice can carry hantavirus. Some of these pests carry real health risks, so it helps to know when to clean up yourself and when to call a licensed company.

Common pests in Colorado

Colorado's public health department, Colorado State University Extension and the CDC all publish guidance on these pests.

• Deer mice. Deer mice spread the most common hantavirus in the US. People usually catch it by breathing in dust from mouse urine, droppings or nests. Don't sweep or vacuum droppings. Spray them with disinfectant until very wet first, and air out closed spaces such as cabins and sheds before you clean. See our page on rodents.
• Miller moths. CSU Extension says these moths can be very annoying when they get into homes and cars, usually in May or June. They pose no danger to people, plants or clothing, and they don't feed or lay eggs indoors.
• Mosquitoes. Colorado has had cases of West Nile virus every year since 2002, and the risk runs mainly from June through early September. Drain standing water around your house often, from flowerpots, clogged gutters, birdbaths and toys. See our page on mosquitoes.

Who licenses pest control companies in Colorado

The Colorado Department of Agriculture licenses pest control businesses through its Pesticide Applicator Certification and Licensing Program. Any business that applies pesticides for hire must hold a commercial applicator license, and staff who evaluate pest problems and recommend treatments on their own must be licensed as qualified supervisors. Read more on the department's licensing program page, and verify a business or applicator with its pesticide applicator search. The search shows only current licenses.

How to check a company before you hire

1. Search for the company on the business tab of the state's applicator search, and ask for the name of the licensed supervisor on your job.
2. Ask what pest they found and how they'll handle it. For mice, ask how they'll find and seal the places mice are getting in.
3. Get the treatment plan, the number of visits and any guarantee in writing.
4. Read reviews from other Colorado customers. If you've used a company, you can write a review, and you can read how reviews work.