Which item is NOT listed as a possible component of a sprinkler system's water supply?

• A. Gravity tank
• B. Fire pump
• C. Reservoir
• D. River water supply

Answer: (D)

Think about what counts as a component of a sprinkler system’s water supply: storage, delivery, and pressurization devices. A gravity tank stores water at height to create pressure without a pump. A fire pump boosts pressure when the available source can’t meet demand. A reservoir stores a larger quantity of water to ensure there’s enough flow for the system during a fire. A river water supply, however, is a source rather than a discrete component of the system. It might feed the system through an intake, pump, and any necessary treatment, but it isn’t itself listed as a separate component. That’s why river water supply isn’t considered a listed component, making it the correct choice.