To determine if a product is hazardous, look for the words POISON, DANGER, WARNING, or CAUTION on the label. 

Please bring waste in five-gallon containers or smaller. 
 

The following items are accepted:

• Automotive products (brake fluid, oil filters).
• Antifreeze. Limit: 5 gallons per vehicle per day
• All batteries EXCEPT standard alkaline. Place each battery in an individual plastic baggie. Batteries must weigh less than 2 pounds each.
• Cleaning supplies.
• Fluorescent lights, compact fluorescent lights (CFL), High Intensity Discharge (HID) lights, yard light bulbs, and their ballasts. Limit: 10 per vehicle per day. NO broken bulbs or light tubes taped together. Transport them in their original boxes if possible. Ballasts labeled as “no PCBs” should be disposed of as garbage.
• Glues and adhesives.
• Liquid fuels. Limit: 5 gallons per vehicle per day.
• Motor oil. Limit: 5 gallons per vehicle per day
• Oil-based and latex paint. Limit: 10 gallons per vehicle per day.
• Pesticides.
• Pool and hobby chemicals.
• Propane containers (5 gallons or smaller). Limit: 3 propane tanks per vehicle per day.
  • Accepted tanks include:
    • Standard barbecue tanks.
    • Compact camp stove propane canisters (such as the green Coleman single-use fuel canisters).
    • Small, narrow propane cylinders used by plumbers and other contractors.
• Products containing mercury. Place thermometers in their original containers or in two plastic sealable bags.
• Thinners and solvents.

See here for items not accepted at HazoHouse. For a full list of restrictions, see here.