Trying to make the entire house a faraday cage would be tough. All of the doors and windows would have to be meshed, along with the roof and walls. It might be easier and cheaper just to build a metal outbuilding on your lot, place it on a non-conductive flooring, and make sure it is grounded to an external rod. Your generator, spare pump, electronics, etc., could be stored safely inside, and removed after the EMP has wreaked its havoc.