Plumbing Mystery Resolved

Mystery solved.  Thanks to a burst pipe.  In a wall.  Along the only pipe in the Monty Pythonesque plumbing that can't be isolated from the water pump.  So no running water, and the downstairs apartment is flooded.  I expect a nice crop of Peziza domiciliana any day now.

Fortunately I have 5 - 7 days of drinking water stashed away.  And plenty of snow.  It's not the heavy wet stuff, so bringing it to melt will be a pain, but at least I have something to wash with until I can find someone willing to come out here to fix the plumbing.  But I need to deal with the insurance first.  When they open on Monday.  

No matter what, I need to take care of this before all the snow is gone.  With any luck it will keep snowing and I can put this off indefinitely.