Normal construction and cleanout debris is welcome: lumber, drywall, roofing, siding, flooring, cabinets, doors, carpet, furniture and household junk.
Hazardous material is out. Paint, solvents, fuel, motor oil, pool chemicals, pesticides, antifreeze and batteries all need a household hazardous waste route rather than a container.
Liquids of any sort are refused, and so is anything still under pressure, including propane and other gas cylinders.
The Dallas County landfill handles tires and electronics on separate terms, and its concession for small resident loads applies only to City of Dallas residents, so a Duncanville homeowner pays the commercial route either way. Pull tires, televisions and computers out before loading.
Asbestos never goes in a standard container. Duncanville has a lot of 1950s and 1960s housing stock, and floor tile, pipe wrap and some siding from that era can contain it. If something looks suspect mid-demolition, stop and call your account manager before the load is touched.