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New US Marine Fire Extinguister Regulations Effective April 2022

A new law regarding the fire extinguishers that must be carried aboard recreational boats goes into effect April 20, 2022. The new regulation, which can be found in the Federal Register at CFR 33 Part175 subpart E breaks down into three main takeaways and applies to recreational boat less than 65 feet LOA.

These new changes do not include changes to the quantity of fire extinguishers already required on vessels relative to their size, but they do require the adoption of a new rating system going forward.

Any approved fire extinguisher installed before August 22, 2016 can remain on a recreational vessel as long as it is serviceable. Disposable fire extinguishers cannot be older than 12 years from the date stamp on the bottle. Expired disposable extinguishers must be removed from service and taken off the boat by December 31 of their 12th year.

As with the current regulations, all extin­ guishers onboard must be in serviceable working condition. They must have pressure gauge or indication showing the extinguisher is in the operable range, and must have lock pins firmly in place. Discharge nozzles must be clean and free of obstructions, and there should be no signs of damage or corrosion.


The US Coast Guard will now use the Underwriters Laboratory performance-based classification system for portable fire extinguishers. Most extinguishers already in circulation have Coast Guard and UL rating classifications.

The new classification system requires portable and semi-portable extinguishers to be marked with a combined number and letter designation. The letter designates what class of fire the extinguisher

is suitable for. The number indicates the extinguishing potential.


In addition to being onboard and accessible, all semi-portable and portable fire extinguish­ ers must be "Marine Type-USCG Approved" with the correct classification, meaning they must have Coast Guard classification system marking and approval numbers on the label.


Extinguishers UL Classified 5-B:C/10-B:C (or greater) meet carriage requirements for all recreational vessels regardless of vessel age.

Extinguishers rated as Marine Type USCG Type B:C, size I or size II are only acceptable on vessels built in model year 2017 or earlier.

Ratings that include higher numbers or more letters are acceptable.

One 20-B extinguisher may be carried to replace two required 5-B extinguishers. The regulations include special rules for vessels built prior to 1952.

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