[devodave]

Sorry, got focused on solution and not your setup. Not sure how the piping setup is, but each user would have to electrically power the pump unless there is a common pressure tank and main that splits off for the two homes. If that is the case, the two of you may want to build a pump house to house the holding tank(s) and any treatment equipment, etc. Each residence would most likely require its own supply pump in holding tank(s) and a pressure tank/switch to supply each residence when needed.