Connecticut Department of Energy & Environmental Protection

DEEP headquarters at 79 Elm Street in Hartford is currently closed due to recent water damage impacting multiple areas of the building. We are working to remediate the situation and get the building back open to staff and the public as soon as possible. While the building is closed, Staff continue to work either remotely or in alternate locations. We continue to be able to receive documents via U.S. Mail or courier service, and our electronic file submittal protocols remain unchanged. For updates, please click here

Cooling Tower

 All persons using pesticides professionally in Connecticut must possess an up-to-date certificate issued by the Department of Energy and Environmental Protection.

An applicant for the Cooling Tower certificate is expected to possess a working knowledge of the kinds of operations performed by the Cooling Tower applicator and the reasons for performing them. Outlined below are areas in which an applicant should be proficient.

Study Materials

General Supervisory Study Materials ( for all categories) (Click here and review information)

Cooling Tower ( General Information PDF)

Cooling Tower Cornell Manual (Buy here)

Microbial Pest Control Guide (PDF)

Antimicrobial Pest Control Guide (PDF)



Contact information:

Please email deep.pesticideprogram@ct.gov if you have any questions


Content last updated on July 26, 2022