Hello,
I would check the service at the house first. Check the ground and the neutral/messenger at the house. It could be bad and all current running to the water. I put in ser and and 150amp diconnect/meter in my parents place a couple of years back. I cut free the service drop with gloves. When I reconnected the bare messenger first I got spark. When I finished my work, I looked at the neigbors house. Her messenger was broke and all the current was traveling through her water main and back through mine, out my messenger. Current loves the lowest resistance path home and just because the main is off in the house you are fed by, doesnt mean current can not come from a neighbors service. This is just some personal experience.
