(from Wikipedia – Fire Hydrant) : Hydrant coloring may be due to either purely practical criteria or more artistic. In the United States, the AWWA and NFPA recommend hydrants be colored chrome yellow for rapid identification apart from the bonnet and nozzle caps which should be coded according to their available flow.

These are guidelines and not laws. The service that maintains fire hydrants in a district are not required to paint them in this manner. Estimates are that only half paint hydrants are painted according to this code. Some places the body is painted yellow, red, silver with the bonnet and nozzle caps painted according to the code. In other places the entire fire hydrant is painted according to the code.
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