Fire Extinguisher Inspection Frequency Guide

Fire extinguisher inspection frequency depends on the type of inspection — monthly visual, annual maintenance, 6-year internal, or hydrostatic pressure testing — and the type of extinguisher. Here's every interval, who performs it, and how to stay on schedule.

Complete Inspection Frequency Table

Frequency by Extinguisher Type

Dry Chemical (ABC) — Most Common

• Monthly: Visual inspection every 30 days
• Annual: Full maintenance by certified technician
• 6-Year: Internal examination at 6 years from manufacture date
• 12-Year: Hydrostatic pressure test

Dry chemical ABC extinguishers are the workhorse of commercial fire protection — found in offices, retail, warehouses, and schools. The 6-year internal exam is unique to stored-pressure dry chemical types and is often missed by building owners who think annual inspections cover everything.

CO2 (Carbon Dioxide)

• Monthly: Visual inspection (check weight by lifting — CO2 has no gauge)
• Annual: Full maintenance (weight verification is critical)
• 5-Year: Hydrostatic testing (more frequent than dry chemical)

CO2 extinguishers require hydrostatic testing every 5 years — 7 years sooner than dry chemical types. They also need weight checks during monthly inspections since they have no pressure gauge. A CO2 extinguisher that has lost more than 10% of its charged weight must be recharged.

Wet Chemical (Class K)

• Monthly: Visual inspection
• Annual: Full maintenance
• 5-Year: Hydrostatic testing

Found in commercial kitchens. Class K extinguishers must be within 30 feet of cooking equipment and inspected at the same frequency as CO2 types. The annual maintenance must include verification that the extinguisher is properly matched to the kitchen's suppression system.

What Happens If You Miss an Inspection?

Monthly inspection missed: If you miss one month, perform it immediately and document the gap. A single missed month is unlikely to trigger a fire marshal citation if all previous months are documented. Multiple consecutive missed months is a pattern of non-compliance.

Annual inspection missed: A missed annual is serious. The extinguisher's tag is expired — it is out of compliance with NFPA 10 and OSHA 1910.157. Fire marshals will cite this. Insurance carriers may deny claims if a fire occurs and extinguisher records are not current. The extinguisher must be inspected by a certified technician immediately, and the gap in coverage should be documented.

6-year or hydrostatic test missed: The extinguisher is overdue for critical safety testing. It must be removed from service and either tested or replaced. A cylinder that is overdue for hydrostatic testing may have undetected corrosion or metal fatigue that could cause catastrophic failure during use.

How FireInspected automates inspection scheduling

FireInspected automatically calculates the next inspection due date for every extinguisher based on the last service date and the extinguisher type. You'll get automated reminders at 30, 14, and 7 days before each customer's inspections are due — whether that's a monthly visual, an annual maintenance, a 6-year internal, or a 5- or 12-year hydrostatic test. No more manually counting dates on a calendar or scrolling through spreadsheets.

The dashboard shows you at a glance which customers have inspections due this week, this month, or overdue. Each customer profile has a complete inspection history — every date, every technician, every tag — so you can prove compliance instantly during a fire marshal visit or insurance audit.

For a deeper dive into the complete inspection checklist, see our NFPA 10 inspection requirements guide. For a side-by-side comparison of monthly vs annual procedures, see our monthly vs annual inspection guide. And for the full frequency explanation with FAQ, see our complete inspection frequency blog post.