Ordinary building and cleanout debris is welcome. The limits come from Rhode Island law and from the acceptance rules at the state landfill.
Rhode Island Resource Recovery says plainly that regulated hazardous waste and regulated medical waste are banned from any acceptance at its facilities, along with waste brought in from out of state. Televisions, computers, monitors, laptops, tablets and mercury-added products are banned from landfill disposal, so they have to leave your container before it goes.
That also rules out liquids, paint, solvents, fuel and asbestos, which belong with a hazardous waste program rather than in a roll-off container.
Sorting is not optional here. Resource Recovery requires loads to arrive separated by material, and a mixed load can be charged entirely at the higher rate or refused at the scale. Stumps, long beams and dusty material carry a handling surcharge on top.
Mattresses, tires and appliances all have their own routes in Rhode Island. Flag them with your account manager when you book so the quote is right the first time.