Which hydrants have the highest GPM, listed as 1500+?

• A. Red hydrants
• B. Green hydrants
• C. Orange hydrants
• D. Blue hydrants

Answer: (D)

Firefighters use hydrant color coding to quickly gauge water flow capacity. The color shown on a hydrant indicates how much water it can deliver in gallons per minute. The blue color is used to signify the highest category—1500 gallons per minute or more. That’s why blue hydrants have the highest GPM. Other colors (red, orange, green) represent lower flow ranges, though exact thresholds can vary by jurisdiction. In practice, knowing that blue means the largest supply helps teams plan water sources, but you still consider distance, pressure, and available supply from the water system.