OSHA Fire Extinguisher Requirements for Workplaces
Reviewed by a licensed fire protection engineer
OSHA 29 CFR 1910.157 requires employers to provide fire extinguishers matched to workplace hazards, mount them within 75 feet of any employee, inspect them monthly, have them professionally serviced annually per NFPA 10, and train employees on proper use. Violations carry penalties starting at $16,131 for serious citations. Compliance with NFPA 10 satisfies OSHA — but local fire codes may add requirements.
OSHA 1910.157 Governs Every Fire Extinguisher in Your Workplace
OSHA 29 CFR 1910.157 is the federal standard for fire extinguishers in workplaces. It specifies what types are needed, where they must be placed, how often they must be maintained, and how employees must be trained. The standard incorporates NFPA 10, so full compliance with NFPA 10 satisfies OSHA — though local fire codes may impose additional requirements. You must comply with whichever standard is most stringent.
According to OSHA, fire extinguisher violations are among the top 10 most frequently cited workplace safety violations. NFPA reports that portable extinguishers are effective in 95% of fire incidents where they are used — but only when properly maintained, correctly placed, and operated by someone who knows the PASS technique.
When Fire Extinguishers Are Required
Most workplaces need fire extinguishers. Only very low-hazard areas with no combustible materials may be exempt. An automatic sprinkler system can substitute for portable extinguishers if the system provides equivalent protection — but most employers maintain both.
The employer must assess whether fire hazards exist that require extinguishers. Nearly all workplaces qualify. If new processes, equipment, or chemicals are introduced, the assessment must be updated.
Selecting the Right Extinguisher for Each Hazard
The employer must identify what types of fires could occur and match extinguishers accordingly:
Class A (ordinary combustibles) — paper, cardboard, wood, fabrics. Required in offices, storage areas, and general workspaces.
Class B (flammable liquids) — solvents, paints, oils, gasoline. Required wherever these materials are used or stored.
Class C (electrical) — electrical equipment and live wiring. Required in electrical rooms, server rooms, and areas with energized equipment.
Class D (combustible metals) — magnesium, sodium, titanium. Required only in facilities handling these metals. Specialized agent required.
Class K (cooking oils) — commercial kitchen cooking equipment. Required under OSHA and NFPA 96. Standard ABC extinguishers are inadequate for oil and grease fires.
If an area has multiple hazard types, a multiclass extinguisher (typically ABC) addresses all present risks. A warehouse with wood storage and electrical equipment needs at minimum an ABC-rated unit.
Placement and Accessibility
Extinguishers must be visible — not hidden behind machinery or inside closed cabinets. Mounting height per NFPA 10: no more than 42 to 60 inches to the top of the unit depending on weight. Access must be unobstructed with nothing stored in front of or on top of the extinguisher.
Maximum travel distance is 75 feet to the nearest extinguisher for Class A hazards. Class B hazards require 50-foot travel distance. Some specific hazards require 40-foot distance. Locations must be marked with signage so employees can find them quickly in an emergency.
The most common placement violation: extinguishers locked in cabinets, blocked by stored materials, or mounted too far from where fires could actually start.
Monthly Inspections
OSHA 1910.157(e) requires monthly inspection of every portable fire extinguisher. Your own staff can perform these — no certification required. The check takes under a minute per unit: verify the pressure gauge reads in the normal range, look for physical damage, confirm the tamper seal is intact, and confirm the unit is in its designated location.
Sign and date the inspection tag on the extinguisher. The dated tag is your compliance record.
Annual Professional Maintenance
OSHA 1910.157(e) requires annual professional inspection and maintenance by a certified NFPA 10 technician. The technician removes the safety pin and handle, inspects internal components, tests pressure against a calibrated gauge, verifies charge weight, and checks for blockage or contamination. They examine the hose, nozzle, valve stem, and all seals.
The technician attaches a dated tag with their signature and certification number. This tag is what the fire marshal checks — overdue tags are cited as a violation. Annual inspections typically cost $15 to $40 per unit as of 2025 depending on region and volume.
Hydrostatic Testing at 6 and 12 Years
NFPA 10, incorporated by OSHA, mandates hydrostatic testing at intervals determined by extinguisher type. Stored-pressure units require internal examination at 6 years and hydrostatic pressure testing at 12 years. If the 12-year test fails, the cylinder is condemned and replaced.
Hydrostatic testing costs $30 to $75 per unit plus recharge. For small extinguishers, replacement is often more economical than testing. Track manufacture dates in a spreadsheet with calendar reminders — missing these deadlines is one of the most common compliance failures.
Recharge After Any Use
If an extinguisher is discharged — even partially — it must be immediately recharged or replaced. A partially used unit is not compliant. Recharge costs $30 to $60 per unit. Do not leave a discharged extinguisher in its cabinet. It creates a false sense of protection and is a code violation until recharged.
Employee Training Requirements
Under 29 CFR 1910.157(g), any employee who may use a fire extinguisher must be trained. Training covers the PASS technique (Pull pin, Aim at base, Squeeze handle, Sweep side to side), extinguisher limitations, fire class identification, and when to evacuate instead of fighting a fire.
Training happens when first assigned and annually thereafter. Document training with attendance records, dates, and topics. Both written/online and hands-on training meet OSHA requirements, though hands-on practice with a training extinguisher is more effective.
The critical training message: extinguishers are for small, contained fires only. If the fire is spreading, smoke is heavy, or the escape route is threatened, evacuation is the correct response.
Documentation and Compliance Tracking
Build a facility inventory: every extinguisher listed with location, type, size, manufacture date, last inspection date, last professional service date, and 6-year and 12-year test due dates. Set calendar alerts when any maintenance is due. Maintain records of all inspections, maintenance, and training in a location accessible during OSHA inspection.
If using a service contractor, verify their NFPA 10 certification covers your extinguisher types.
OSHA Violations and Penalties
Common citations include missing extinguishers in hazardous areas, overdue inspection tags, undocumented training, inaccessible placement, and extinguishers mounted too high. Serious violations carry penalties of $16,131 or more per violation. Repeated violations (same citation within 5 years) carry penalties up to $161,323. Willful violations carry the same maximum.
Documentation violations — no training records, no inspection evidence, illegible tags — are cited at the same severity as missing equipment.
Coordination with Local Fire Code
OSHA incorporates NFPA 10. Local fire codes also adopt NFPA 10. Compliance with one typically satisfies the other — but some jurisdictions are stricter. Restaurants in some areas require semi-annual inspections rather than OSHA's annual requirement. The restaurant must meet the more stringent standard.
Your fire protection contractor should understand both OSHA and local fire code requirements and ensure your program satisfies both.
Frequently Asked Questions
Can an automatic sprinkler system replace portable fire extinguishers?
OSHA allows automatic sprinkler systems to substitute for portable extinguishers if the system provides equivalent protection. However, most employers maintain both — sprinklers and portable extinguishers serve different response functions.
How far apart should fire extinguishers be in a workplace?
Maximum travel distance is 75 feet for Class A hazards and 50 feet for Class B hazards. This means extinguishers must be spaced so no employee is more than 75 feet from the nearest unit in any direction.
What is the penalty for not having fire extinguishers at work?
OSHA serious violation penalties start at $16,131 per violation. Repeated violations within 5 years jump to $161,323 maximum. If a fire occurs in a workplace without extinguishers and an employee is injured, liability exposure is substantial.
Who can perform monthly fire extinguisher inspections?
Any facility staff member can perform monthly visual inspections — no certification required. The check covers pressure gauge reading, physical damage, tamper seal integrity, and proper placement. Sign and date the inspection tag.
Does OSHA require hands-on fire extinguisher training?
No. OSHA 29 CFR 1910.157(g) accepts both written/online and hands-on training. However, hands-on practice with a training extinguisher is more effective and is recommended by fire safety professionals.
What should I do if an extinguisher is partially discharged?
Replace or recharge it immediately. A partially discharged extinguisher is non-compliant and unreliable. Do not return it to its cabinet. Contact your vendor for recharge service or install a replacement unit while the discharged unit is serviced.