Most household junk and building debris can go in a roll-off. The limits come from Maine's waste rules and from the waste plant that takes your load.
Maine Waste to Energy won't accept hazardous waste as defined by federal and Maine rules, or the special wastes Maine regulates separately. Its facility rules also turn away explosives, ashes, loose liquids, and vehicles. The plant doesn't take fluorescent bulbs either.
Hazardous waste, liquids, paint, solvents, fuel, and asbestos can't go in a standard dumpster. For household hazardous waste, the City points residents to collection days run by its regional partner, AVCOG.
Some items go to a separate area at the plant instead of the main pit. These include large appliances, car batteries, stumps, wooden pallets, and construction debris that won't burn. Tell your account manager about any of these before you load.