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.
When you have one or two fire extinguishers which need disposing of, we always advise our customers to contact their nearest refuse recycling centre. A free option, they have the capacity to dispose of a few cylinders. Failing that, your local scrap metal centre may be able to help.
How to Safely Dispose of Expired Fire Extinguishers
Instead the disposal depends on the condition of the fire extinguisher. If it still has charge, the local fire protection professional should be able to help dispose of it in an appropriate manner. If it is empty, the local recycling facility will provide directions for recycling the steel canister. To make sure there is no pressure remaining …
If you need assistance, you can bring your fire extinguisher to your local fire department to safely do it for you. They may take it for recycling while you’re there. If not, you can bring your canister to any recycling facility that recycles steel. Check before you go. Where to Dispose of Old Fire Extinguishers
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Disposal Process for Used, Expired Fire Extinguishers Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher