A leak from a hydro panel can occur from the 4 inch sleeve hole, through the foundation wall to receive the hydro conduit. A leak can occur from outside the hydro conduit and drip down behind and below the panel. Or a leak can occur inside the hydro conduit, and drip into the hydro panel. This can be sealed by a trademarked product provided by "AquaSeal Grout™". If you notice water in the area of the electrical hydro panel, chances are you have a hydro panel leak or a leaking hydro conduit. Due to the danger of electric shock, it’s important a highly trained and experienced technician works on the hydro panel leak.