Are you using this well? If you aren't and don't plan to in the future you may want to plug it.
However if you are using the well you may want to divert the excess water outside the pump house.
This raises some more questions. Does the well have a water resistant well cover (no water lines out the top) or does it have a Sanitary Well Seal (pipe or pipes and wires coming out through it).
I suspect it's a Sanitary Well Seal. If this is the case the seal may be leaking from the artesian pressure. There is usually a vent plug (1/4" or 1/2" pipe plug). You may be able to remove the vent plug and install fittings and pipe to divert it outside the pump house.