No plumbing fixture or other device which provides a connection between a drinking water supply and a drainage, soil, waste or other sewer pipe so as to make possible the backflow of sewage or wastewater into the water system, shall be installed or be permitted to remain installed. Water which has been used for cooling or for any other purpose shall not be returned to the system. All plumbing shall conform to the local plumbing code. Where no local plumbing code is in effect, plumbing shall conform to the Standard Plumbing Code, ASA A 40-8 1955. Drains and overflows from food and drink equipment shall not be connected directly to a sewer.
178 Neb. Admin. Code, ch. 1, § 004