What is defined as a facility containing pumps that move water through the distribution system?

The correct answer is a pump station. A pump station is specifically designed to house pumps that are essential for moving water throughout a distribution system. These facilities play a crucial role in ensuring an adequate water supply reaches various locations by overcoming gravitational or frictional losses within the pipes.

In contrast, a pressure tank serves to maintain water pressure within the system but does not include pumping mechanisms. A water treatment plant is primarily focused on treating and purifying the water supply, preparing it for safe consumption, rather than moving it through the distribution network. A reservoir, on the other hand, is a storage facility for water, allowing for the accumulation and management of water resources, but does not have active pumping capabilities. Each of these alternatives has a unique function within the water distribution and management system, but it is the pump station that is directly associated with the movement of water.