1.5K views | Why are fire Hydrant painted yellow? The main body of a fire hydrant is yellow in color however the tops or “bonnets” are painted green in Fayetteville and a variety of different colors in other cities to gives department personnel a tactical advantage in locating it. Yellow indicates water-flow capacity of 500 to 999 GPM. Fayetteville Fire Department on Sapona road near Kinlaws, doing a fine job | Fayetteville City News | Facebook