Inspection, testing, and maintenance. According to NFPA 25, a fire hydrant must be inspected annually and after each operation. The flow must be tested each year and maintenance must be performed annually as well.
4.13.1 Public fire hydrants should be flow tested every 5 years to verify capacity and marking of the hydrant. In the explanation that accompanies the section ( …
How often do fire hydrants need to be tested? – AskingLot.com
Regarding this, how often do you inspect a fire hydrant? Hydrants should be inspected on a regular basis at least once a year. Dry-barrel fire hydrants may require two inspections per year, in the spring and fall. Every hydrant inspection should be documented, and problems with a hydrant should be reported immediately.
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AWWA Field Guide: Hydrant Flow Tests Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher