What is the correct order of hydrant color codes from least to greatest?

The correct order of hydrant color codes from least to greatest based on flow capacity is Red, Orange, Green, Light Blue.

This system is used to provide firefighters with a quick visual reference to the water flow availability from a hydrant. The colors signify the gallons per minute (GPM) that a hydrant can reliably provide. Red indicates a flow of less than 500 GPM, which is considered inadequate for most firefighting operations. Orange represents a flow of 500 to 999 GPM, indicating a moderate capacity. Green indicates a flow of 1,000 to 1,499 GPM, suitable for most firefighting needs. Light Blue signifies a flow of 1,500 GPM or more, representing an excellent water supply for firefighting purposes.

Understanding this color code system allows firefighters to make informed decisions quickly during emergencies, ensuring they can select the hydrants that will provide the necessary water supply for the situation at hand.