Wow. Never saw this reply until today. This isn’t a construction contractor’s license which you don’t need. It’s a license from the Oregon department of agriculture to perform the service of applying a pesticide to treat moss. They classify anything that has the action of killing moss as a pesticide whether that be bleach/copper/zinc etc.
Also, as of Jan 1, 2018 any company providing janitorial service with employees must be state licensed as a Property Services Contractor. BOLI : Welcome Page : For Workers : State of Oregon
