Here in Tucson, AZ, the water is hard with minerals and this causes problems for our water-using appliances. Clothes washers can have minerals contaminate the water inlet valves causing them to not turn off completely and fill the tub when the machine is off. The hard water also can affect the outcome of your laundry. You may need to add a water softener like baking soda to assist in cleaning and reducing the amount of soap needed. Annually it is good to have your clothes washer inspected by a qualified appliance repair company to make sure it is functioning properly. Tub seals can start to leak and not be noticed until it is too late.