Most construction and household debris is fine to load. Texas has a firm list of items no landfill may accept, and the landfill that takes your load may add its own limits.
The Texas Commission on Environmental Quality's prohibited wastes list keeps these out of every municipal landfill in the state: lead-acid batteries, used motor oil from home oil changes, used oil filters, whole tires, refrigerators, freezers, and air conditioners with refrigerant, most liquid waste, regulated hazardous waste, PCB waste, and radioactive material.
Paint, solvents, fuel, propane tanks, and asbestos don't belong in a standard dumpster either. Colleyville residents can schedule door-side pickup of household hazardous waste and electronics through the City's trash service, which is a better route for those items.
When you're not sure about something, ask your account manager before it goes in.