Maybe I'm paranoid, but I never leave the house with the dishwasher, clothes washer or dryer in operation. If I take a whiz before leaving, I even make sure the water to the toilet has stopped flowing before I go out the door. (in warm weather I pee after I go out the door) If I am going to be away overnight I even shut off the breaker to the well pump just in case there is a problem and something springs a leak while I'm gone. A few years ago my oldest brother and his wife left the washing machine running while they went to church and a late breakfast. They came home and a connection to the washer had blown a gasket...ruined their hardwood floor and sub flooring in the kitchen and laundry room and made a mess in the cellar. Do you leave the household machines running when you aren't home??