Most construction and cleanout debris can go in. The limits come from Illinois law and from the rules at the disposal site.
Illinois bans televisions, computers, and many other electronics from landfills, so those items need to be recycled. State law also bans used tires from landfills. The Illinois Environmental Protection Agency warns that batteries can start fires in trucks and at landfills, so take them to a drop-off site.
Hazardous waste, liquids, paint, oils, solvents, fuel, and asbestos can't go in a standard dumpster. Hot ash and anything flammable should stay out too.
Appliances also need separate handling. Mention fridges, freezers, or other large appliances when you book.
If you're unsure about something, ask your account manager before you load it.