: : We have a well pump and pressure tank that are 4 years old. Just recently, whenever the pump tums off there is a loud double "thunk" and if you watch the pipe, it seems to jump. What could be causing this and how serious is it?

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: Seems to be a bit tough using this.But it sounds like one of a number of things have happened, to narrow it down more information about your system would be nice to have. Such as the system type and how old the system is. This looks like your check valve most likely in the well is not closing fast enough. A hole in the pipe could be your trouble. Ben

Ben,
Your web site is quite nice. Anyone interested in pumps and well water should check out the link below. Terry

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