Bring non-empty fire extinguishers to either Seattle HHW location.
Empty CO2 and halon (bromo difluoromethane) extinguishers can also be recycled. Look in the yellow pages of the phone book under "Fire Extinguishers" for companies that recycle them. See Local Hazardous Waste Management Program for more information.
In Seattle and King County, empty fire extinguishers can go in the garbage.
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