Most household junk and building debris is fine to load. The limits come from Virginia's landfill rules and from what the receiving landfill accepts.
Hazardous waste, liquids, paint, solvents, fuel, and asbestos can't go in a standard dumpster. Older buildings can hide asbestos in pipe wrap, tile, and siding, so have suspect material checked before a big tear-out.
Brush and yard debris are handled apart from regular trash at the county landfill. If your job includes tree limbs or yard cleanup, tell us so they can be kept separate.
Tires, batteries, and appliances that hold refrigerant usually need special handling too. Mention them when you book so there are no surprises.
When in doubt about an item, ask your account manager before you load it.