Most household and construction debris is fine. The Solid Waste Agency's landfill has a longer banned list than many, and Iowa law adds its own rules.
The Agency's restrictions page bans hazardous liquids and paints, ammunition, pressurized cylinders, tires, appliances, TVs and computer monitors, fluorescent bulbs, solar panels, and car batteries. Corrugated cardboard, yard waste, free-flowing liquids, and improperly packaged asbestos are also refused. Many of these items can be recycled at the Agency for a fee.
Iowa law bans yard waste from landfills and allows tires only after they've been processed. That's why grass, leaves, and branches go to the Agency's compost site instead of a dumpster.
If the landfill finds a banned item in your load, the whole load is subject to a surcharge. Pull out boxes, tires, appliances, and screens before loading.
When you're unsure about an item, ask your account manager before it goes in.