By national electric code (assuming you are in the us) the washer must
be on its own "Laundry" Circuit. If you have a fairly new panel, with
some extra space, it wouldnt be too hard to add mor plugs in the
basement. You should also check the sump pump isnt on a 30 amp
circuit. If anyone has a sump pump THAT big, the house should be
equiped with life preservers :