This building contains the majority of the Yodelin water system components, including the mains pressure pumps, the system controller, the filtration systems, and spare parts. There is an entrance at road level and at the ground floor. The building is locked and only accessible to water system volunteers and plowing volunteers.

In the event that the system is in alarm status, a red light will illuminate to the right of the door.

After 9/11 the federal government mandated that the pump house be secured via a fence to prevent terrorist attacks on water systems. Remnants of the fencing can still be found near and around the pump house.