Antifreeze is primarily composed of ethylene glycol, a sweet and poisonous compound which can kill or injure pets, birds, fish, and other wildlife when carelessly disposed into the environment.

It can also contain heavy metal contaminants picked up from vehicle engines during use.


  • Repair any leaks in your vehicle's radiator system.
  • If available in your community, take your used antifreeze to an antifreeze recycling center.
  • If recycling is not an option, contact your local wastewater treatment plant to determine if you can dispose of the antifreeze down a drain connected to the wastewater treatment plant. Never pour antifreeze into a septic system or lagoon.
  • If no options are available, antifreeze must be saved for a household hazardous waste collection. Do not mix antifreeze with any other substance.