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Fire Extinguisher Inspection Requirements: NFPA 10 & OSHA Explained

Fire extinguisher inspection requirements under NFPA 10 mandate monthly visual checks by building owners, annual maintenance by certified technicians, a 6-year internal examination for dry-chemical units, and hydrostatic pressure testing every 5 or 12 years depending on type. OSHA 29 CFR 1910.157 independently requires monthly and annual inspections in all workplaces.

The Four Levels of Fire Extinguisher Inspection

NFPA 10 Standard for Portable Fire Extinguishers establishes four distinct inspection and service tiers, each with a different frequency and qualified-person requirement.

1. Monthly Visual Inspection (Owner/Occupant)

The monthly check is an owner or occupant responsibility — no certified technician is required. Per NFPA 10 §7.2.1 and OSHA 1910.157(e)(1), check:

  • Extinguisher is in its designated location and accessible
  • Gauge reads in the green/operable range (typically 100–175 PSI for stored-pressure dry chemical)
  • Pull pin is in place and tamper seal is intact
  • No visible physical damage, corrosion, leakage, or clogged nozzle
  • Operating instructions label is legible and facing outward
  • Hose and nozzle are free of obstructions

Document monthly checks with date and initials on the inspection tag attached to the unit or in an electronic record.

2. Annual Maintenance (Certified Technician Required)

Annual maintenance must be performed by a qualified, certified fire extinguisher technician — most states require a state license. This covers everything in the monthly check plus:

  • Verification of full charge by weight or pressure gauge
  • Test of operating mechanism
  • Inspection of seals, O-rings, and gaskets
  • Examination of dry powder for caking or clumping
  • Replacement of tamper seal and inspection tag with current date
  • Confirmation of correct agent type, weight, and pressure for the unit

OSHA 1910.157(e)(2) requires the employer to retain annual maintenance records for at least one year after the last entry or the life of the shell, whichever is less.

3. 6-Year Internal Examination (Dry-Chemical Units)

Every 6 years, stored-pressure dry-chemical extinguishers — the common red ABC units — must be:

  • Completely emptied and depressurized
  • Internally examined for corrosion, damage, or contaminated agent
  • Recharged with new agent if required
  • Labeled with the examination date

This applies specifically to extinguishers that require a 12-year hydrostatic test. CO2, water, wet-chemical, and Halon extinguishers follow different schedules.

4. Hydrostatic Testing (Pressure Vessel Testing)

Extinguisher TypeTest Interval
Water (APW)Every 5 years
Carbon dioxide (CO2)Every 5 years
Wet chemical (Class K, kitchen)Every 5 years
Water mistEvery 5 years
Dry chemical (stored pressure)Every 12 years
Halon (where still in service)Every 12 years

Hydrostatic testing pressurizes the cylinder to 1.5–2x its service pressure to verify structural integrity. It must be performed by a facility with proper test equipment and documented with a permanent stamp or label on the cylinder.

NFPA 10 vs. OSHA 1910.157

Both standards require monthly visual checks and annual maintenance — but they differ in scope and additional requirements:

RequirementNFPA 10OSHA 1910.157
Monthly visual inspectionYesYes
Annual maintenanceYesYes
6-year internal examinationYes (stored-pressure types)No
Hydrostatic testingYesNo
Applies toCommercial/multi-family buildingsAll general industry workplaces
Disposable extinguishersReplace at 12 yearsNo specific rule

OSHA 1910.157 does not include the 6-year internal examination — that is a NFPA 10-only requirement. Where both standards apply (most commercial workplaces), the more stringent rule governs.

Disposable vs. Rechargeable Extinguishers

Disposable (non-rechargeable) extinguishers cannot be recharged or hydrostatically tested. They must be replaced when discharged or when they reach 12 years old. Always check the manufacture date stamped on the bottom of the cylinder before performing annual maintenance — a unit past its useful life must be replaced, not serviced.

Record-Keeping Requirements

  • Monthly inspection: Date and initials on the tag attached to the unit (or electronic record)
  • Annual maintenance: Service tag with technician name, company, date, and next service date; plus a separate written record retained per OSHA
  • Hydrostatic test: Permanent stamp or collar label on the cylinder itself
  • IFC §901.6: Where adopted, requires all fire protection records to be kept on the premises for a minimum of three years

How Software Handles Extinguisher Compliance

High-volume extinguisher accounts — a hospital with 200 units, a warehouse with 80 — need software that tracks service due dates per unit, not per account. Look for platforms where the 6-year and 12-year service intervals are automatically calculated from the last service date captured during scanning, and where technicians are alerted when any individual unit is overdue. See Best Fire Extinguisher Inspection Software for a comparison.

This guide is for informational purposes. Always consult the current edition of NFPA 10 and your local AHJ for authoritative requirements. Last updated: June 2026.

Frequently Asked Questions

How often do fire extinguishers need to be inspected?
Fire extinguishers require four levels of inspection under NFPA 10: a monthly visual check by the building owner or occupant, an annual maintenance check by a certified technician, an internal 6-year examination for stored-pressure dry-chemical units, and hydrostatic pressure testing every 5 or 12 years depending on extinguisher type. OSHA 29 CFR 1910.157 independently mandates the monthly and annual requirements for all workplaces.
Can a building owner perform fire extinguisher inspections themselves?
Building owners or designated employees may perform the required monthly visual inspection — checking placement, gauge reading, pin and seal, and visible condition. However, the annual maintenance inspection must be performed by a qualified, certified fire extinguisher technician. Most states require technicians to hold a state license for annual service work.
What is the 6-year fire extinguisher inspection requirement?
Every 6 years, stored-pressure dry-chemical fire extinguishers must be completely emptied, internally examined for corrosion or contaminated agent, and refilled. This is required because dry-chemical extinguishers undergo a 12-year hydrostatic test, so NFPA 10 mandates a mid-cycle internal check. CO2, water, and wet-chemical extinguishers do not follow this 6-year rule.
How often does a fire extinguisher need to be hydrostatically tested?
CO2, water (APW), wet-chemical (Class K), and water mist extinguishers require hydrostatic testing every 5 years. Standard dry-chemical extinguishers require testing every 12 years. Testing must be performed by a facility with proper pressure test equipment and documented with a permanent label on the cylinder.
What happens if a fire extinguisher fails its annual inspection?
A failed extinguisher must be immediately removed from service, tagged out-of-service, and either repaired or replaced. Under OSHA 1910.157, employers must ensure extinguishers are fully charged in their designated places. A failed extinguisher left in service is a citation risk. Local fire codes typically require a replacement to be in place before the failed unit is removed.
Are fire extinguisher inspections required in residential homes?
NFPA 10 and OSHA 1910.157 do not apply to single-family residences — these are commercial and workplace standards. Multi-family residential buildings are typically regulated as commercial occupancies and must comply with NFPA 10. Single-family homeowners are strongly advised to follow the NFPA 10 schedule voluntarily.

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This guide is for informational purposes. Always consult the current NFPA standard and your local AHJ. About our content.