If someone has ever looked at a fire hydrant, they may have noticed that the caps on them can be different colors.
These different colors are actually for a reason and in a release, the De Pere Public Works broke down what each color means. The hydrant cap color is there to tell firefighters, water/maintenance workers, and other emergency responders the flow rate of the water inside. Knowing the flow rate of the water inside the hydrant can be vital in allowing emergency responders to quickly determine the capacity of the hydrant and make plans quickly and effectively in times of emergencies.