Ordinary household and building debris is fine. The limits come from California law and from the county landfill's own list at the gate.
California groups several common items as universal waste and keeps them out of the trash entirely. The state names eight categories: batteries, electronic waste, picture tubes and tube glass, lamps, mercury waste, aerosol cans that aren't empty, and solar panels. The state's own guidance says these cannot go in household trash or into landfills and have to reach a proper handler or recycler.
The county landfill list goes further. Asbestos, batteries, brake linings, chemicals, fuel tanks, mufflers, paints, poisons, hazardous waste, medical waste, explosives, pesticides, contaminated soil, and wet liquid waste are all turned away. So is chemically treated wood, meaning railroad ties, utility poles, and lumber used for fences, decks, or play structures.
Tires are a separate problem in Orange County. The county no longer takes them at any of its landfills, so they have to go to a tire recycler instead. Set them aside and tell us about them when you book.
Clean concrete, brick, and soil are welcome, and a load kept clean usually costs less to dispose of. If you're not sure where an item lands, ask your account manager before it goes in the container.