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From Wikipedia:
"Above ground hydrants are coloured for purely practical criteria or more aesthetic reasons. 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. Class AA hydrants (>1500 gpm) should have their nozzle caps and bonnet colored light blue, Class A hydrants (1000–1499 gpm), green, Class B hydrants (500–999 gpm), orange, Class C hydrants (0–499 gpm), red and inoperable or end-of-system (risking water hammer) black. This aids arriving firefighters in determining how much water is available and whether to call for additional resources, or find another hydrant."
https://en.wikipedia.org/wiki/Fire_hydrant