Everyday household and construction debris is fine. The limits come from Texas rules and from the landfill's own refusal list, which is longer than most.
Texas keeps hazardous waste out of municipal landfills entirely, and it treats industrial and special wastes as separate categories that need state approval before a landfill can take them. Whole tires are out as well. The state allows tires only after they've been split, quartered, or shredded, so tires in a roll-off container are a problem.
The Garland landfill also turns away ammunition, closed drums, fuel tanks, friable asbestos, liquids, motor oil and used oil filters, lead acid batteries, sandblast grit, septic tank waste, and infectious or hospital waste. Anything with freon in it, including refrigerators and air conditioners, is refused. So are commercial loads of electronics such as televisions, office machines, and computer equipment.
Household chemicals from Dallas County homes go to the county's Home Chemical Collection Center, reachable at 214-553-1765, and large appliances go to the City's recycling center on Commerce Street instead.
Holding something you can't classify? Describe it to your account manager before it goes in the container.