Most household and construction debris loads without trouble. The limits come from Missouri's landfill rules, which are strict about a handful of items.
Missouri keeps five things out of its landfills: major appliances, whole tires, waste oil, lead-acid batteries and yard waste. Major appliances means refrigerators, freezers, washers, dryers, stoves, ovens, dishwashers, water heaters and similar white goods. Microwaves came off that list years ago and can go in the container.
Tires and car batteries both have take-back routes. Missouri tire retailers have to accept the tires they replace, and battery sellers have to take your old battery when you buy a new one. St. Charles County also accepts automotive batteries at its recycling sites.
Yard waste needs its own path too. The county's advice is to keep grass, leaves and clippings on the property where they grew, and to compost or mulch rather than bury them.
Hazardous waste, liquids, paint, solvents, fuel and asbestos can't go in a standard container either. If you're holding something and you're not sure, ask your account manager before it goes in.