Everyday building and household debris is welcome. The limits come from Connecticut's statewide rules and from what the facility weighing your load will take.
Connecticut makes recycling mandatory for every resident and every business, and it bans three things outright from disposal: grass clippings, lead-acid and motor vehicle batteries, and household electronics such as televisions, monitors, printers, and computers. A load that shows up carrying a real volume of recyclables can be turned away at the facility, and that cost lands back on the customer.
Paint, mattresses, mercury thermostats, gas cylinders, and tires all run through separate statewide programs, so keep them out of the container and mention them when you book.
Hazardous waste, liquids, solvents, fuel, used oil, and asbestos cannot go in a standard dumpster anywhere in the city. Danbury's own drop-off site also refuses ammunition, fireworks, antifreeze, motor oil, and tires.
Got an item you can't place on either list? Ask your account manager before it goes over the rail.