Why are fire hydrants painted different colors?

Fire hydrants are color-coded to provide information to the firefighters. The color represents the size of the water main, which determines the amount of water that flows from the hydrant.

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1. What number should I call if I need the Fire Department?
2. I called for an ambulance, why did the fire truck respond?
3. I'd like to become a Green Bay firefighter, what do I need to do?
4. How can I get a burning permit?
5. Why are fire hydrants painted different colors?
6. Who takes care of the fire hydrants?
7. Why does the fire department inspect buildings?