How often does a fire extinguisher need to be inspected?

Short answer: Fire extinguisher inspection follows three escalating intervals: a monthly visual check by anyone trained, an annual maintenance examination by a qualified servicer, and a hydrostatic pressure test every 5 or 12 years depending on the extinguisher type. OSHA 29 CFR 1910.157(e) and (f) set these duties for employers, and NFPA 10 supplies the detailed schedule. Any extinguisher is recharged after any use, even a partial discharge.

Fire extinguisher inspection: monthly checks, annual service, and hydrostatic testing (2026 Guide)

Every portable fire extinguisher on a wall is a pressure vessel that must stay charged, accessible, and undamaged to work in the seconds it is needed, so the unit is verified on a layered schedule rather than left until it fails. OSHA 29 CFR 1910.157(e) and (f) make the employer responsible for inspection, maintenance, and hydrostatic testing of portable extinguishers, and the agency adopts NFPA 10, Standard for Portable Fire Extinguishers, for the detailed intervals. The three duties are distinct: a frequent visual inspection, a deeper annual maintenance, and a periodic hydrostatic test of the shell.

This guide separates those three obligations, explains who is allowed to perform each one, and shows how the service tag documents the chain. Whether you manage one rechargeable extinguisher in a shop or hundreds across a campus, the fire extinguisher inspection cadence is the same — only the recordkeeping scales. Getting the interval right is what keeps a unit compliant and, more importantly, functional.

Why this matters.
A fire extinguisher that fails the moment it is grabbed is worse than no extinguisher, because it costs the user the seconds they had to escape. OSHA cites employers under 29 CFR 1910.157 when extinguishers are not inspected monthly, not maintained annually, or not hydrostatically tested on schedule, and an under-pressurized or corroded unit can discharge weakly or rupture. The U.S. Fire Administration stresses that an extinguisher only helps on a small, incipient fire — and only if it is fully charged and in its designated place when someone reaches for it.

Part 1 — The three inspection duties, separated

OSHA and NFPA 10 use three different words for three different actions, and conflating them is the most common compliance error. Inspection is a quick monthly look. Maintenance is a thorough annual examination. Hydrostatic testing is a periodic pressure test of the cylinder itself. Each has its own interval and its own qualification requirement.

Inspection vs. maintenance vs. testing

An inspection confirms the extinguisher is present, charged, and undamaged from the outside — it takes under a minute and any trained employee can do it. Maintenance is a hands-on annual teardown-level check by a qualified person. Hydrostatic testing pressurizes the shell with water to prove it can still safely hold its charge. The three build on each other; passing a monthly look does not substitute for the annual service.

Why the layered schedule exists

Frequent visual checks catch the common failures — a discharged gauge, a missing pin, an obstructed unit — while the rarer structural failures, corrosion and metal fatigue, only show up on the deeper annual and multi-year examinations. Stacking short and long intervals means a defect is caught at the cheapest point. A common home unit like a Kidde 2-A:10-B:C home extinguisher sits on the longest, 12-year shell cycle.

Part 2 — The monthly visual inspection

OSHA 29 CFR 1910.157(e)(2) requires a visual inspection at an interval not exceeding 30 days. It is a fast, no-tools check that any trained person can run, and it is the single most valuable habit for keeping extinguishers functional. The point is to confirm the unit is where it should be, is full, and shows no obvious damage.

What to look at every month

Confirm the extinguisher is in its designated place, visible, and unobstructed; that the pressure gauge needle reads in the green operable range; that the pull pin and tamper seal are intact; and that there is no physical damage, corrosion, leakage, or a clogged nozzle. Verify the operating label is legible. Check fullness by lifting the unit to feel its weight — a light cylinder may have leaked. A unit on an ABC dry-chemical extinguisher line that reads low on the gauge comes out of service immediately.

Recording the monthly check

Document each inspection — at minimum the date and the inspector's initials on the attached tag or an equivalent log. The record is both the compliance proof OSHA expects and the trail that shows a unit has not been skipped. A wall-mounted extinguisher cabinet keeps the tag protected and the unit visible for the monthly walk-through.

Source: OSHA 29 CFR 1910.157(e)/(f) and NFPA 10. Intervals are by extinguisher type; the hydrostatic-test row is the longest cycle and condemns rather than repairs a failed shell.

Part 3 — The annual maintenance examination

OSHA 29 CFR 1910.157(e)(3) requires an annual maintenance check of every portable extinguisher. Unlike the monthly look, maintenance is a thorough examination of the mechanical parts, the extinguishing agent, and the expelling means, and it must be performed by a trained, qualified person — typically a licensed fire-equipment servicer. The service date is recorded on a durable tag attached to the extinguisher.

Who is qualified to do it

Annual maintenance is not a self-service task for most operations; it requires someone trained on the specific extinguisher type and equipped to open, examine, and recertify it. The servicer dates and signs the tag, which becomes the record that the annual obligation was met. For units worth the recurring service cost, a refillable model such as a Kidde 3-A:40-B:C high-capacity extinguisher is the economical choice over a disposable.

How the tag tells the story

The service tag is the inspection chain in one place: it shows the manufacture date, the last annual maintenance, the last internal examination, and the last hydrostatic test. A facility manager auditing a wall of extinguishers reads the tags first. A missing or outdated tag is the fastest sign a unit is out of compliance.

Part 3.5 — Internal examination by type

Separate from the annual maintenance, NFPA 10 requires a more invasive internal examination on intervals that vary by extinguisher type. For a stored-pressure dry-chemical unit, the internal examination interval is 6 years; other agents and designs carry their own intervals. The internal exam empties and inspects the cylinder from the inside, then recharges it, which is why it is a servicer task rather than an in-house one.

Part 4 — Hydrostatic testing intervals

Hydrostatic testing is the longest-interval duty and the one that proves the pressure shell itself is still sound. OSHA 29 CFR 1910.157(f) and NFPA 10 set the interval by extinguisher type. The test pressurizes the cylinder with water to a specified pressure to confirm it will not rupture; a unit that fails is condemned, not repaired.

The 5-year cylinders

Carbon-dioxide (CO2) extinguishers and water/APW (air-pressurized water) extinguishers require hydrostatic testing every 5 years. These shorter cycles reflect the higher pressures or the corrosion exposure of water-based units. A water-based unit such as a compact water-based extinguisher falls on the 5-year cycle.

The 12-year cylinders

Stored-pressure dry-chemical, wet-chemical, dry-powder, and halon extinguishers require hydrostatic testing every 12 years. Most general-workplace units — multipurpose dry-chemical extinguishers such as the amzboom MSWJ-500C ABCK 3-pack on shop and office walls — sit on this 12-year cycle, as do Class K kitchen extinguishers.

Part 5 — Recharge after any use

An extinguisher is recharged after any use, even a partial discharge — a quick test squeeze counts. A rechargeable unit that has been used is no longer fully charged and will not perform on a second fire, so it goes back to a servicer to be refilled and re-pressurized before it returns to its bracket. Disposable, single-use units cannot be recharged and are replaced after any discharge or when the gauge drops out of the green. This is why higher-traffic facilities standardize on rechargeable models such as the First Alert HOME2PRO rechargeable extinguisher.

Part 6 — Building an inspection program

For a multi-unit site, the program is a calendar plus a map: every extinguisher has a location, a monthly inspector, an annual service vendor, and a known hydrostatic-test due date driven by its type. Pairing the inspection program with hazard-based selection under NFPA 10 — and with the storage controls in OSHA flammable cabinet requirements — closes the loop between having the right extinguisher and keeping it ready. The broader employer duties live in OSHA 1910.157 for portable fire extinguishers.

Part 7 — Worked example: a quarterly facility extinguisher audit

Here is how a facility or safety manager turns the OSHA and NFPA 10 intervals into a repeatable audit for a building of mixed extinguisher types, using units stocked on this site:

1. Inventory every unit and its type. Walk the building and log each extinguisher's location, agent type, and tag dates. Type drives the test cycle: a multipurpose Kidde FA110G ABC extinguisher is a 12-year shell; a CO2 or water unit is a 5-year shell.
2. Run the monthly visual on each. Confirm each unit is in its designated place, unobstructed, with the gauge in the green, pin and seal intact, no corrosion or leakage, and a legible label. Lift each one to verify fullness by heft. Initial and date the tag on the spot.
3. Pull anything that fails the look. Tag out and remove any unit reading low, damaged, or used — even partially. A discharged First Alert HOME1 rechargeable extinguisher goes to the servicer for recharge; a spent single-use unit is swapped for a fresh replacement such as an amzboom 4-pack with mounting brackets.
4. Reconcile annual and hydrostatic dates. Read each tag's last annual maintenance and last hydrostatic test. Flag any unit past its annual date, any dry-chemical shell approaching 12 years, and any CO2 or water shell approaching 5 years, and schedule the servicer.
5. Schedule the qualified servicer. Book the licensed fire-equipment servicer for the flagged annual maintenances, internal examinations, recharges, and hydrostatic tests in one visit. Confirm each returned unit has an updated, dated tag before it goes back on its bracket — for spares, a amzboom 2-pack with mounting brackets keeps replacements staged and mounted.

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Repeating this quarterly keeps the monthly checks honest and surfaces the multi-year tests before they lapse. Match each rated unit to its hazard using the best fire extinguishers guide, then keep it ready with this audit cadence.

Frequently asked questions

How often does a fire extinguisher need to be inspected?

A portable fire extinguisher needs a visual inspection at least monthly — OSHA 29 CFR 1910.157(e)(2) sets an interval not exceeding 30 days — plus an annual maintenance examination and a periodic hydrostatic test. The monthly check is a quick in-house look; the annual and the hydrostatic test are servicer tasks. See the employer duties in our OSHA 1910.157 guide.

What is the difference between inspection and maintenance?

Inspection is the quick monthly visual check that the extinguisher is present, charged, and undamaged — anyone trained can do it in under a minute. Maintenance is the thorough annual examination of the mechanical parts and agent, performed by a qualified servicer who dates the tag. Passing the monthly look does not replace the annual maintenance.

What do you check during a monthly fire extinguisher inspection?

Confirm the unit is in its designated place, visible, and unobstructed; the pressure gauge reads in the green; the pull pin and tamper seal are intact; and there is no physical damage, corrosion, leakage, or clogged nozzle. Verify the label is legible and lift the unit to check fullness by weight. Record the date and your initials on the tag.

Who can perform a monthly fire extinguisher inspection?

Any trained person can perform the monthly visual inspection — it is intended to be an in-house task with no tools required. The deeper annual maintenance, internal examination, and hydrostatic testing must be done by a trained, qualified servicer. Keeping the monthly check in-house is what makes the frequent interval practical for a facility.

How often is annual maintenance required?

OSHA 29 CFR 1910.157(e)(3) requires a maintenance examination of every portable extinguisher once a year. It is a thorough check by a qualified servicer, who records the service date on a durable tag attached to the extinguisher. The annual maintenance is separate from, and in addition to, the monthly visual inspection.

What is hydrostatic testing?

Hydrostatic testing pressurizes the extinguisher cylinder with water to a specified test pressure to prove the shell can still safely hold its charge. It is the longest-interval check and is performed by a certified testing facility. A cylinder that fails the test is condemned and removed from service rather than repaired.

How often does a fire extinguisher need hydrostatic testing?

The interval depends on the extinguisher type under OSHA 1910.157(f) and NFPA 10. Carbon-dioxide (CO2) and water/APW extinguishers are tested every 5 years; stored-pressure dry-chemical, wet-chemical, dry-powder, and halon extinguishers are tested every 12 years. The tag records the last test date.

Which extinguishers are on the 5-year hydrostatic cycle?

CO2 extinguishers and water-based or air-pressurized-water (APW) extinguishers require hydrostatic testing every 5 years. The shorter cycle reflects the high internal pressure of CO2 units and the corrosion exposure of water-based shells. A unit like a compact water-based extinguisher falls on this 5-year cycle.

Which extinguishers are on the 12-year hydrostatic cycle?

Stored-pressure dry-chemical, wet-chemical, dry-powder, and halon extinguishers are tested every 12 years. Most general-workplace units — multipurpose ABC dry-chemical extinguishers and wet-chemical Class K kitchen extinguishers — sit on this longer cycle.

How often is an internal examination required?

NFPA 10 sets the internal examination interval by extinguisher type, separate from the annual maintenance. A stored-pressure dry-chemical extinguisher, for example, gets an internal examination at 6 years. The internal exam empties, inspects, and recharges the cylinder, so it is a qualified-servicer task rather than an in-house one.

Do I need to recharge a fire extinguisher after using it?

Yes. A rechargeable extinguisher is recharged after any use, even a partial discharge or a quick test squeeze, because it is no longer fully charged and will not perform on a second fire. Send it to a qualified servicer for refilling and re-pressurization before it returns to its bracket. Standardizing on a rechargeable extinguisher makes this practical.

What is the difference between a rechargeable and a disposable extinguisher?

A rechargeable extinguisher can be refilled and re-pressurized by a servicer after use or as part of maintenance, while a disposable single-use unit cannot be recharged and is replaced after any discharge or when its gauge drops out of the green. Rechargeable units cost more upfront but are the economical choice where annual service already applies — for example a Kidde 3-A:40-B:C high-capacity extinguisher.

What goes on a fire extinguisher tag?

The service tag records the manufacture date, the last annual maintenance, the last internal examination, and the last hydrostatic test, plus the servicer's identification. Many facilities also record the monthly visual inspections — date and initials — on the same tag or an equivalent log. The tag is the first thing an auditor reads.

What happens if a fire extinguisher fails inspection?

Any unit that is low on the gauge, damaged, corroded, leaking, used, or past a required service date is tagged out and removed from service immediately, with a charged replacement put in its place. A rechargeable unit goes to the servicer; a failed cylinder or spent single-use unit is replaced from the fire extinguishers catalog.

Does OSHA require fire extinguisher inspections?

Yes. OSHA 29 CFR 1910.157(e) requires employers to provide a monthly visual inspection and an annual maintenance check, and 1910.157(f) requires hydrostatic testing on the schedule in NFPA 10. Employers are cited when extinguishers are missing, unmaintained, or untested. The broader rule is covered in our OSHA 1910.157 guide.

How long does a fire extinguisher last?

A well-maintained rechargeable extinguisher can stay in service for many years as long as it passes its annual maintenance, internal examinations, and hydrostatic tests; the hydrostatic test ultimately governs the shell's life. Disposable units carry a shorter usable life and a printed expiration. Match the rated class to your hazard first using our fire extinguisher classes guide.

Can I do fire extinguisher maintenance myself?

You can and should perform the monthly visual inspection yourself, but the annual maintenance, internal examination, recharging, and hydrostatic testing require a trained, qualified servicer with the right equipment and certification. Doing the annual service in-house without that qualification does not satisfy OSHA 1910.157, and it covers the same hazard-assessment logic as the OSHA 1910.132 PPE requirements.

Further reading on this site

• Fire extinguishers — the full catalog, with the unit types that drive different test cycles.
• Rechargeable extinguishers — refillable units that earn back the recurring annual service cost.
• Class K kitchen extinguishers — wet-chemical units on the 12-year hydrostatic cycle.
• OSHA 1910.157 explained — the full employer inspection, maintenance, and testing duties.
• Fire extinguisher classes explained — match the rated class to the hazard before you schedule service.
• How to use a fire extinguisher — the PASS discharge method an inspected unit is kept ready for.
• OSHA 1910.132 PPE requirements — the general hazard-assessment rule that frames extinguisher selection.
• Kidde 3-A:40-B:C high-capacity extinguisher — a higher-capacity rechargeable shell on the 12-year test cycle.