The customer shall, at his own risk and expense, furnish, install and keep in good and safe condition all equipment that may be required for receiving, controlling, applying and utilizing water, and the District shall not be responsible for any loss or damage caused by the improper installation of such water equipment, or the negligence, want of proper care or wrongful act of the customer or of any of his tenants, agents, employees, contractors, licensees or permittees in installing, maintaining, using, operating or interfering with such equipment. The District shall not be responsible for damage to property caused by spigots, faucets, valves and other equipment that are open when water is turned on, either when the water is turned on originally or when turned on after a temporary shutdown.