How Often Do Fire Extinguishers Need to Be Inspected?

Quick Answer

• Monthly: Visual inspection every 30 days — no certification required (NFPA 10 §7.2)
• Annually: Full maintenance inspection every 12 months — certified technician required (NFPA 10 §7.3)
• 6-year: Internal examination for stored-pressure dry chemical types (NFPA 10 §7.3.3.1)
• 12-year: Hydrostatic pressure test for most dry chemical types (NFPA 10 §8.3)
• 5-year: Hydrostatic testing for CO2 and wet chemical (Class K) extinguishers

Fire extinguisher inspection frequency is set by NFPA 10 (Standard for Portable Fire Extinguishers) and reinforced by OSHA 1910.157. There are four distinct inspection and service events, each with different frequency requirements, different qualified personnel, and different documentation requirements.

The four inspection levels and their frequency

Inspection Type	Frequency	Who Performs It	NFPA 10 Reference
Monthly visual inspection	Every 30 days	Building owner or designated employee	§7.2
Annual maintenance inspection	Every 12 months	Certified fire extinguisher technician	§7.3
6-year internal examination	Every 6 years	Certified technician	§7.3.3.1
Hydrostatic testing (dry chemical)	Every 12 years	DOT-certified testing facility	§8.3
Hydrostatic testing (CO2, wet chemical)	Every 5 years	DOT-certified testing facility	§8.3

Monthly visual inspection — every 30 days

NFPA 10 §7.2 requires that every portable fire extinguisher be visually inspected once per month. This does not require a certified technician — the building owner, a designated maintenance employee, or a trained facility staff member can perform it.

The monthly check verifies:

The extinguisher is in its designated, accessible location and not blocked
Operating instructions on the nameplate are legible and facing outward
The safety seal and tamper indicator are intact
No visible physical damage, corrosion, or clogged nozzle
The pressure gauge is in the operable (green) range
For non-gauge types: fullness confirmed by weighing or hefting

Monthly inspections must be documented. The date and initials of the inspector must be recorded either on the tag or in an electronic log. See our free monthly inspection checklist for a printable form.

Annual maintenance inspection — every 12 months

NFPA 10 §7.3 requires a full maintenance inspection annually. This must be performed by a certified fire extinguisher technician. Annual maintenance goes significantly beyond the monthly visual check:

Remove the extinguisher from its bracket or cabinet
Verify the date of manufacture and confirm the 6-year and 12-year service windows
Check weight against the nameplate-stamped weight
Inspect the hose, nozzle, and discharge lever for proper operation
Verify the extinguisher type matches the fire hazard classification of the area
Confirm the mounting bracket is secure and at the correct height (NFPA 10 §6.1.3)
Attach a new annual maintenance tag with all required documentation fields

The annual maintenance tag must show: the month and year maintenance was performed, the person or company that performed the work, and identification of the extinguisher serviced. See our NFPA 10 inspection requirements guide for the complete annual checklist.

6-year internal examination

For stored-pressure dry chemical extinguishers that are on a 12-year hydrostatic test cycle, NFPA 10 §7.3.3.1 requires an internal examination at the 6-year mark from the date of manufacture. This is not a pressure test — it's a visual internal inspection where the extinguisher is discharged, the valve is removed, and the cylinder interior is checked for corrosion, pitting, or chemical caking. If it passes, it's reassembled, recharged, and a 6-year maintenance label is attached.

Hydrostatic testing — every 5 or 12 years

Hydrostatic testing verifies that the cylinder can safely hold its rated pressure. The interval depends on the extinguisher type:

Dry chemical (stored-pressure): Every 12 years
CO2: Every 5 years
Wet chemical (Class K): Every 5 years
Clean agent: Every 12 years

Hydrostatic testing must be performed at a DOT-certified facility with calibrated equipment. It cannot be done in the field. See our full hydrostatic testing guide for costs ($25–$60/unit) and procedure details.

What OSHA says about inspection frequency

OSHA 1910.157(e)(3) requires employers to perform maintenance inspections and tests on portable fire extinguishers at intervals specified in NFPA 10. OSHA does not set independent frequencies — it defers entirely to the NFPA 10 standard. Monthly and annual inspections are therefore both an OSHA and NFPA 10 requirement for commercial properties. See our OSHA fire extinguisher requirements guide for employer obligations in detail.

Related guides

NFPA 10 Inspection Requirements — Complete Guide — Monthly, annual, and internal maintenance requirements with NFPA code references.
Hydrostatic Testing: Costs, Intervals & NFPA Requirements — What hydrostatic testing costs and which extinguisher types need it when.
Fire Extinguisher Inspection Cost (2026 Pricing Guide) — What to charge for monthly, annual, and hydrostatic inspection services.
Free Monthly Inspection Checklist — Printable NFPA 10-compliant monthly inspection checklist.
Printable Inspection Tag Templates — Monthly and annual inspection tag templates, free PDF download.
OSHA Fire Extinguisher Requirements (1910.157) — Employer obligations for inspection, maintenance, and employee training.

Frequently asked questions

How often do fire extinguishers need to be inspected?

Fire extinguishers require a monthly visual inspection (every 30 days) and a full annual maintenance inspection every 12 months per NFPA 10. Additionally, most dry chemical extinguishers need a 6-year internal examination and a 12-year hydrostatic pressure test. CO2 and wet chemical extinguishers require hydrostatic testing every 5 years.

Who can perform monthly fire extinguisher inspections?

Monthly visual inspections can be performed by the building owner, a designated employee, or maintenance staff. No certification is required for monthly visual checks. However, annual maintenance inspections must be performed by a certified fire extinguisher technician.

How often must a fire extinguisher be inspected per OSHA?

OSHA 1910.157(e) requires employers to inspect, maintain, and test all portable fire extinguishers at intervals required by NFPA 10. This means monthly visual inspections and annual maintenance performed by a certified technician. OSHA does not set its own independent inspection frequency — it defers to NFPA 10 standards.

Do fire extinguishers need monthly inspections?

Yes. NFPA 10 §7.2 requires that every portable fire extinguisher be inspected monthly (every 30 days). The monthly inspection is a visual check — it confirms the extinguisher is in place, accessible, the gauge is in the green zone, the seal is intact, and there is no visible damage. It does not require a certified technician.

How often do fire extinguishers need to be serviced (not just inspected)?

Full annual maintenance service is required every 12 months. This goes beyond a visual check — the technician removes the extinguisher from its bracket, verifies weight, checks the hose and valve, verifies hydrostatic test dates, and attaches a new annual tag. For dry chemical types, a 6-year internal exam (discharge and internal inspection) is also required.

How long is a fire extinguisher inspection valid?

A fire extinguisher inspection tag is valid until the next required inspection interval — typically 1 month for monthly checks and 12 months for annual maintenance. An annual maintenance tag does not replace monthly inspections; both are ongoing requirements. The annual tag shows the most recent full-service date.

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