Most construction and cleanout debris is fine to load. Connecticut's recycling law and the usual hazardous waste rules set the limits.
Recycling is mandatory in Connecticut. The Department of Energy and Environmental Protection says everyone must recycle, from homes to businesses. That covers glass and metal food containers, plastic bottles and jugs, corrugated cardboard, boxboard, newspaper, magazines, and office paper. Scrap metal, appliances, car batteries, rechargeable batteries, used oil, and leaves have their own recycling programs too.
In practice, flatten and recycle your cardboard instead of tossing it in the container, and set aside metal and batteries.
Hazardous waste, liquids, paint, solvents, fuel, and asbestos can't go in a standard dumpster. Bloomfield residents can bring oil-based paint, pool chemicals, fluorescent bulbs, and similar items to the household hazardous waste collection days run by the Metropolitan District Commission. Call its hotline at 860-278-3809 for dates.
If you're not sure about an item, ask your account manager before it goes in the container.