Do fire extinguishers expire?
Fire extinguishers do not expire on a date. OSHA sets a maintenance and hydrostatic-test schedule, and lists specific damage that takes a unit out of service permanently.
The word people are reaching for is not expiry, it is service life, and the difference matters because it changes what you do about it. A carton of milk has a date on it and then it is finished. A fire extinguisher has a schedule, and a unit that is kept on that schedule can stay in service far longer than it might appear, while a unit that has been dropped or has begun to corrode is finished today regardless of its age.
This page is general information, not professional advice, and it is not legal advice. Fire code is adopted locally, so the schedule that governs your building comes from your own fire marshal and your insurer.
The schedule OSHA actually writes
OSHA requires stored pressure dry chemical extinguishers that need a twelve-year hydrostatic test to be emptied and put through the applicable maintenance procedures every six years. Dry chemical extinguishers with non-refillable disposable containers are exempt from that. And when a recharge or a hydrostatic test is performed, the six-year clock starts again from that date.
Source: OSHA, 29 CFR 1910.157
So the two numbers a building owner hears — six and twelve — are a maintenance interval and a pressure-test interval, not a shelf life. Between them sits the annual check, which is a different visit again.
What retires an extinguisher early
OSHA lists the conditions that take an extinguisher out of the ordinary hydrostatic test schedule: repair by soldering, welding, brazing or a patching compound; damaged cylinder or shell threads; corrosion that has caused pitting, including corrosion hidden under a removable name plate; the unit having been burned in a fire; and a calcium chloride extinguishing agent having been used in a stainless steel shell.
Source: OSHA, 29 CFR 1910.157
Any one of those means the unit is done, whatever the tag says. It is also why the corrosion point is worth taking seriously — the pitting that condemns a cylinder is often underneath the label, where nobody looks.
Is a twenty-five-year-old fire extinguisher still good?
Only a technician with the unit in their hands can answer that, and the answer turns on three things rather than on the year: whether the shell passes an internal and external examination, whether it still holds pressure, and whether anyone can produce a record of the maintenance it was supposed to have had. A very old extinguisher with an unbroken service history is a different object from a very old extinguisher found in a cupboard.
There is a cost floor under this decision too. HomeGuide puts a recharge at $10 to $60 and a replacement extinguisher at $40 to $200, so on a small unit the arithmetic often says replace and stop paying to keep an old shell alive.
Source: HomeGuide
What to do with the old one
Do not put a pressurized cylinder in a household bin, and do not assume it is empty because it feels light. Three routes are usually open, and which one applies is a local question: your fire protection company will normally take the old unit away when it installs the replacement, many household hazardous waste sites accept extinguishers, and some fire departments will take them. Call before you drive anywhere — collection rules differ from town to town and a wasted trip with a pressure vessel in the back seat is worth avoiding.
If the unit is genuinely empty and the head has been removed so it can be seen to be empty, scrap metal recycling is usually straightforward. That last step is one to leave to the company servicing it rather than to a hacksaw.
Questions people ask next
- Do fire extinguishers expire?
- Not on a date. OSHA sets a maintenance and hydrostatic-test schedule instead — including a six-year maintenance for stored pressure dry chemical units that require a twelve-year hydrostatic test.
- How long does a fire extinguisher last?
- As long as it keeps passing its schedule. What ends it early is damage: OSHA names shell repairs, damaged threads, pitting corrosion, fire exposure and calcium chloride in a stainless shell.
- Does recharging reset the clock?
- On the six-year maintenance, yes. OSHA states that when recharging or hydrostatic testing is performed, the six-year requirement begins again from that date.
- How do I dispose of an old fire extinguisher?
- Not in a household bin. Your fire protection company will usually take it when it installs the replacement, and many household hazardous waste sites accept them. Call ahead — collection rules are local.
Written for building owners by Most Recommended Fire Protection, which measures which fire protection companies AI assistants actually recommend. Nobody can pay to be on those lists. How we measure.