Take old smoke detectors to a hazardous waste facility or your local fire department
Smoke detectors contain radioactive material (americium-241) that makes them hazardous waste. You cannot throw them in the trash or curbside recycling. The safest route is your county or city hazardous waste collection site, which accepts them free and handles disposal correctly. If you do not know where yours is, call your local solid waste management office or search "[your city] hazardous waste" online — most sites list drop-off hours and what to bring.
Your local fire department is often a second option. Many fire departments collect old detectors as part of community safety programs, though not all do. Call ahead to confirm they take them and whether you need an appointment. Some fire departments also offer free battery replacement or detector testing while you are there.
A third option is a retailer that sells smoke detectors. Home Depot and Lowe's both accept old detectors at customer service desks in many locations, though policies vary by store. Call your nearest location to confirm before you go.
Key Takeaways
- Smoke detectors contain radioactive material and must go to a hazardous waste facility, not the trash or recycling bin.
- Your county or city hazardous waste collection site is the most reliable option and costs nothing.
- Local fire departments often collect old detectors, but you should call first to confirm they accept them.
- Some retailers like Home Depot accept old smoke detectors at customer service, though availability varies by location.
- Never disassemble a smoke detector or remove the radioactive source yourself.
How to find your nearest hazardous waste facility
Start by calling your city or county solid waste management department. They maintain a list of collection sites and can tell you hours, what to bring, and whether there is a fee (there usually is not). If you do not have the number, search "[your city name] solid waste" or "[your county name] hazardous waste" online.
Many areas also use Earth911.org, a national database of recycling and hazardous waste drop-off locations. Enter your zip code and "smoke detector" to see what is near you, including hours and what each site accepts. Some sites are open only certain days, so check before you make the trip.
If your area has no dedicated hazardous waste facility, ask the solid waste department whether the fire department, police department, or a local waste transfer station accepts detectors. Some smaller towns route hazardous items through one central location.
What to do before you drop off an old detector
Remove the batteries and dispose of them separately at a battery recycling program or hazardous waste site. Most facilities accept batteries alongside other hazardous items. Do not leave batteries inside the detector when you drop it off.
Put the detector in a bag or box so it does not break during transport. If the detector is damaged or the cover is cracked, wrap it carefully and let the facility staff know when you arrive. Do not attempt to open or disassemble the detector yourself — the radioactive source must stay sealed.
Bring your detector as-is. You do not need to clean it, test it, or prepare it in any special way beyond removing the batteries. If you have more than one old detector, bring them all at once — most facilities have no limit on the number you can drop off.
Why smoke detectors are hazardous waste
Ionization smoke detectors (the most common type) contain a tiny amount of americium-241, a radioactive element. This material allows the detector to sense smoke particles in the air. The amount is small and safe when the detector is sealed and working correctly, but it must be handled as hazardous waste once the detector is no longer in use.
Throwing a detector in the trash can expose sanitation workers and contaminate landfills. Putting it in curbside recycling can damage sorting equipment and expose recycling facility workers. Hazardous waste facilities have the equipment and training to handle radioactive material safely and dispose of it according to federal regulations.
Photoelectric smoke detectors (which use light rather than radiation to sense smoke) do not contain radioactive material, but most facilities accept both types together. If you are unsure which type you have, check the label on the back or bring it to the facility and ask.
Smoke detectors with sealed batteries
Some newer smoke detectors have batteries sealed inside and cannot be removed. These still go to a hazardous waste facility or fire department — do not try to pry the battery out. The facility will handle the entire unit as one piece.
Hardwired smoke detectors (connected to your home's electrical system) also contain batteries as backup power. When you replace a hardwired detector, the old one goes to hazardous waste the same way. Turn off power at the breaker before you remove it, and bring it to the facility with the batteries still inside.
What happens after you drop off your detector
The facility logs your drop-off and stores the detector in a find area. Hazardous waste is then transported to a licensed disposal facility where the radioactive material is separated from the rest of the detector. The americium-241 is stored safely or sent to a facility licensed by the Nuclear Regulatory Commission for long-term management.
The rest of the detector — the plastic housing, circuit board, and metal parts — may be recycled or disposed of separately depending on the facility's process. You do not need to track what happens after you leave; the facility is responsible for proper handling from that point forward.
Frequently Asked Questions
Can I throw a smoke detector in the trash if I wrap it up?
No. Wrapping does not make it safe for landfills or trash collection. The radioactive material inside must be handled by a licensed hazardous waste facility. Putting it in the trash puts sanitation workers at risk and can contaminate the landfill.
Is it safe to keep an old smoke detector in my garage or basement?
It is safe to store an old detector for a short time while you arrange drop-off, but do not keep it long-term. The detector is sealed and poses no when ready danger, but it should be disposed of properly rather than left in storage indefinitely. Drop it off at your earliest opportunity.
Do I have to pay to drop off a smoke detector?
Most hazardous waste facilities accept smoke detectors free of charge. Some facilities charge a small fee for certain items, but detectors are usually included in free collection. Call ahead to confirm your local facility's policy.
What if my smoke detector is still working but I want to replace it?
A working detector still goes to hazardous waste once you remove it from service. Do not donate it or give it away — it must be disposed of through a hazardous waste program. The radioactive source is the issue, not whether the detector still functions.
Can I mail an old smoke detector to a recycling company?
No. Radioactive materials cannot be shipped through the mail or by courier. You must take the detector to a local hazardous waste facility, fire department, or retailer in person. This is a federal requirement enforced by the Department of Transportation.