Smoke Detector Disposal: How to Get Rid of Old Smoke Alarms [2026]

Yes — knowing which type you have determines your best disposal option.

Ionization smoke detectors contain a small amount of Americium-241 (Am-241), a radioactive isotope. A typical household unit contains about 0.9 microcuries — an extremely small amount that poses no health risk during normal use or disposal. The EPA confirms that individual household ionization detectors can legally go in regular trash. However, some states and municipalities encourage or require returning them to the manufacturer or taking them to a hazardous waste facility.

Photoelectric smoke detectors use a light sensor instead of radioactive material. These have no special disposal requirements and can always go in regular trash. They can also be recycled as electronic waste in many areas.

How to tell which type you have: check the back of the detector. Ionization models will have a label stating "contains radioactive material" or "Americium-241." If there is no such label, you have a photoelectric or combination unit.

Dual-sensor (combination) detectors contain both technologies. Treat these the same as ionization detectors for disposal purposes.

Return to the manufacturer. First Alert and Kidde both offer take-back programs for their smoke detectors. First Alert provides recycling instructions on their support site. Kidde offers a mail-back program for some models. You pay shipping, but the manufacturer handles proper disposal and recycling of all components. This is the most environmentally responsible option for ionization detectors.

Take to household hazardous waste. Most county HHW facilities accept ionization smoke detectors. Colorado's CDPHE specifically notes that community recycling programs for ionization smoke detectors exist statewide. CuyahogaRecycles in Ohio lists dedicated disposal for smoke detectors. Search "[your county] household hazardous waste smoke detector" to find your local option.

Put in regular garbage. The EPA and multiple state agencies confirm that individual household smoke detectors can go in regular trash. The Wisconsin DNR and New Hampshire DES both state this explicitly. The tiny amount of Americium-241 in a single detector is well below any regulatory threshold for household waste.

Recycle as e-waste (photoelectric only). Photoelectric smoke detectors contain circuit boards and batteries that can be recycled through e-waste programs. Do not put ionization detectors in e-waste recycling — the radioactive component requires separate handling.

NFPA guidelines recommend replacing smoke detectors on this schedule:

• •Smoke detectors (ionization or photoelectric): Every 10 years from the manufacture date

• •Carbon monoxide detectors: Every 5–7 years

• •Combination smoke/CO detectors: Every 7–10 years (check manufacturer guidelines)

The manufacture date is printed on the back of the unit. An estimated 30% of installed smoke detectors in US homes are past their replacement date. Expired detectors may not trigger reliably — the sensors degrade over time regardless of battery replacement.

When you replace detectors, consider upgrading to photoelectric models. They respond faster to smoldering fires (the most common type in home fires) and avoid the ionization disposal complications. Dual-sensor models offer the best protection by combining both technologies.

Before disposing of any smoke detector:

1. 1.Remove the battery. Batteries should be recycled separately — most hardware stores and electronics retailers accept used batteries for free.

1. 1.Do not disassemble the unit. The EPA warns against tampering with ionization detectors, as this could damage the shielding around the radioactive source.

1. 1.If returning to manufacturer, keep the unit intact and package securely. Follow their specific shipping instructions.

1. 1.If putting in regular trash, wrap in a plastic bag to keep the unit contained. No special labeling is required for individual household units.

1. 1.For large quantities (10+), contact your local HHW facility or a private disposal company. Building managers replacing detectors across an entire property should not put large numbers of ionization units in regular trash — the aggregate radioactive material may exceed household waste thresholds.

Most states follow EPA guidance allowing household smoke detectors in regular trash. A few states have stricter rules:

Colorado: The CDPHE encourages using community recycling programs for ionization detectors. Scrap metal recyclers that collect ionization detectors may transfer them to NRC-licensed facilities for proper disposal.

New Hampshire: Recommends returning ionization detectors to the manufacturer for recycling. Notes it is still legal to dispose of them in a landfill.

Wisconsin: DNR guidance allows household smoke detector disposal in regular garbage but encourages manufacturer return.

California: Ionization smoke detectors can go in household trash, but the state encourages using HHW facilities for electronic waste components.

New York City: Accepts smoke detectors in regular trash. DSNY does not list them as requiring special disposal.