Of all the things on a home-maintenance list, testing a smoke alarm is the one that takes the least time and matters the most. It's also the one most households have quietly stopped doing.
That's not a guess. In September 2024, the U.S. Consumer Product Safety Commission, working with NIST and the Fire Protection Research Foundation, ran the largest nationwide survey of its kind on smoke and carbon monoxide alarms. Ninety-nine percent of households reported having at least one smoke alarm, up from 88% in 1994. That part's good news. What isn't: 61% of households test their alarms less often than recommended, and a third never test them at all. When researchers actually checked, 16% of households that believed every alarm in their home was working had at least one that wasn't. Only 84% of households turned out to have even a single fully functional smoke alarm.
The reason testing matters this much is straightforward: a smoke alarm that isn't working is functionally the same as no alarm at all. The data on that gap is old but consistent. NFPA's long-running research on home fires has repeatedly found the death rate in fires is more than twice as high in homes with no working smoke alarm compared to homes where one actually functioned. The alarm doesn't help if a battery died two years ago and nobody noticed.
The actual guidance, from FEMA's U.S. Fire Administration: test every smoke alarm monthly, using the test button. Replace standard 9-volt batteries at least once a year (hardwired alarms with battery backup included). If your alarms use a sealed 10-year lithium battery, you don't replace the battery — you replace the whole unit when it reaches the end of that window, per the manufacturer's instructions. And regardless of battery type, replace the entire smoke alarm every 10 years from its manufacture date (it's usually printed on the back); the sensor itself degrades over time, not just the power source.
A trick that actually works for remembering: the CPSC ties its annual battery-replacement reminder to the twice-yearly daylight saving time change. Same weekend you change your clocks, you change your batteries. It's not a coincidence; it's designed to be one of the only home-safety tasks most people already have a built-in trigger for.
One caveat worth being upfront about: exactly how many alarms you need and where (interconnected so one going off sets them all off, inside every bedroom, outside sleeping areas, one per floor) traces back to NFPA 72, the national fire alarm code. Whether that applies to your specific home depends on which code edition your state or city has adopted, and whether it's enforced retroactively on existing homes or only new construction. Check your local requirements rather than assuming a national default.
This is exactly the kind of task that's easy to mean to do and never actually get around to, which is part of why we built recurring tasks with a specific day-of-month or day-of-week anchor into ProReside's work orders. Set "Test smoke alarms" to repeat on the 1st of every month once, and it's back on your board automatically from then on, not something you have to remember to re-add.