A. “Backflow” means a flow, other than the intended direction of flow, of any foreign liquids, gases or substances into the distribution system of the public water supply.

B. “Backflow prevention device” means a device approved by the State of Washington, Department of Social and Health Services or such other state department as has jurisdiction over the subject matter and by the American Water Works Association, used to counteract back pressure or prevent siphonage into the distribution system of a public water supply.

C. “Cross-connection” means any physical arrangement whereby a public water supply is connected, directly or indirectly, with any other water supply system, sewer, drain, conduit, pool, storage reservoir, plumbing fixture or other device which contains or may contain contaminated water, sewage or other wastes or liquids of unknown or unsafe quality, which may be capable of imparting contamination to a public water supply as a result of backflow. (Ord. 1116 § 2, 1983).