Take extinguisher to hazardous waste disposal facility. If your local fire department is not accepting drop-offs, you can take the extinguisher to a hazardous waste disposal facility. Most cities and counties have their own local center for hazardous waste disposal. Look up centers in your area and schedule a drop off.
The first thing you should do is squeeze the handle to make sure as much of the extinguishing agent as possible gets discharged. Next, remove the head from your fire extinguisher – this will let anyone who sees it know that it has been fully discharged. Finally, recycle the steel fire extinguisher shell – most community recycling centers should accept it.
Fire Extinguisher Disposal or Recycling – First Alert
Although you can’t place an extinguisher in a regular household recycle bin, you can take it to a fire extinguisher service company or recycling facility. Check your local fire extinguisher company listings or earth911.com to find a recycling facility near you. If recycling isn’t a possibility, it is also acceptable to empty the extinguisher and discard it in your regular …
Prepare the fire extinguisher for disposal. According to the San Mateo Consolidated Fire Department, the first step in getting rid of a used fire extinguisher is to determine how much of the contents are still inside the container. The pressure gauge on the side of the canister usually indicates if the canister is charged, overcharged, or empty.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher