Which NFPA standard requires three dump valves to be installed on all MWS apparatus?

The correct answer is based on NFPA 1901, which specifically addresses the requirements for automotive fire apparatus. This standard includes various specifications to ensure the effective and safe operation of fire service equipment. One critical requirement outlined in NFPA 1901 is the installation of three dump valves on Mobile Water Supply (MWS) apparatus. These dump valves are essential for the efficient and rapid discharge of water, allowing for quick operations during emergency situations and facilitating safer fireground activities.

The three dump valves help in minimizing time spent on water supply tasks, enabling firefighters to focus on their core responsibilities during an emergency. The presence of multiple dump valves provides redundancy and improves the overall efficiency of water management in hazardous situations. In contrast, the other standards listed do not specifically mandate this feature for MWS apparatus, making NFPA 1901 the correct choice for this requirement.