Why are Knoxville hydrants blue and yellow? Let's start with the mechanics. There are two parts of a fire hydrant: the "bonnet," which sits on top, and the "barrel," which is the body that comes ...

It has to do with the flow rate of that fire hydrant. Here's what the colors mean, from best to worst: Light blue (Class AA): 1,500 gallons per minute (GPM) or greater, indicating very good flow.

It has to do with the flow rate of that fire hydrant. Here's what the colors mean, from best to worst: Light blue (Class AA): 1,500 gallons per minute (GPM) or greater, indicating very good flow.

A red fire hydrant sits in downtown Jerseyville on Tuesday, Oct. 15, 2024. Residents will start to see some different colors on the city’s fire hydrants, part of a multi-year program by Illinois ...

Q: There is a fire hydrant in the 2000 block of Ardmore Road that is painted purple with a green top. What is the significance of the colors? — J.P.

What might stick out is the distinct color on the fire hydrant's front steamer port: either light blue, green, orange or red. Advertisement As you could've guessed, the colors mean something.

It has to do with the flow rate of that fire hydrant. Here's what the colors mean, from best to worst: Light blue (Class AA): 1,500 gallons per minute (GPM) or greater, indicating very good flow.