Check if the house is provided with any whole house GFCI or if the house is part of any multi-apartment building, check every house is provided with such GFCI.
One tragic incident happened here due to non-provision of GFCI in such type of buildings. A lady, after sending her children to school,went to the bath room to take a shower. When she went under the water spray from the shower, she felt a shock and was electrocuted. Before that, a fellow in an upper apartment was using a defective iron. It had a partial ground fault. The criminal found an ingenious way to use the defective iron. He placed the iron on a wooden table and plugged it into a power socket and after the iron get hot, he would unplug it and use it. But during the time the iron was plugged into the power socket, ground fault current flowed through all parts of the building and also through the shower water in the lower apartment which killed the lady.