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 do the firefighters take the fire trucks to the grocery store?
6. Why are fire hydrants painted different colors?
7. Who takes care of the fire hydrants?
8. Why does the fire department inspect buildings?