Most construction and household debris is fine. The limits come from California's disposal rules and from what the regional landfill accepts.
California bans household hazardous waste from landfills. That includes batteries, fluorescent bulbs, electronics like TVs and computer monitors, paint, motor oil, and antifreeze. Merced County residents can drop many of these items at the Highway 59 Landfill at no cost, but businesses can't.
Standard dumpsters also can't take hazardous waste, liquids, solvents, fuel, or asbestos. The landfill refuses compressed gas cylinders, propane tanks, explosives, and medical waste.
Appliances carry per-item fees at the landfill, and refrigerated units cost more. Set them aside and mention them when you book.
If you're not sure about an item, ask your account manager before you load it.