In firefighting, a nonfunctional hydrant is commonly indicated by which color?

In firefighting, a nonfunctional hydrant is commonly indicated by which color?

• A. Blue
• B. Red
• C. Green
• D. Black

Answer: (D)

Visual hydrant status coding is used so firefighters can quickly tell which water sources will actually supply water. In this system, the color black marks a hydrant as nonfunctional, meaning it is out of service and should not be used. This helps crews avoid wasting precious time trying to operate a hydrant that cannot deliver water, and instead they look for a nearby in-service hydrant or switch to an alternative water supply. Other colors in the scheme convey different service or flow statuses, but the key point is that black indicates the hydrant cannot be relied on at the moment.