According to the Milwaukee Fire Department, a "yellow fire hydrant indicates that the mains are actually running perpendicular to the opening of the fire hydrant." A firehouse spokesman from MFD also shared green tops will indicate a hydrant has a "larger, 12" main and will get more water ou...
What the Color of a New York Fire Hydrant Means According to the NFPA, there are four standard colors for fire hydrant caps: red, orange, green, and blue. A red-capped hydrant has the smallest pipe attachment, while a blue-capped hydrant offers the highest flow of gallons per minute (GP...
Rob LudacerJessica Orwig
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The varying colors of fire hydrant caps are referring to the capacity of the water pipes that feed the hydrant. This helps to communicate to firefighters how much water (and how strong of a flow) they can expect when attaching their hoses. The NFPA breaks it down below. ...