(1) “Air gap” means a physical separation between the free-flowing end of a potable water supply pipeline and the overflow rim of an open or nonpressure-receiving vessel. To be an “approved air gap,” the separation must be at least twice the diameter of the inlet piping (supply pipe) measured vertically, and never be less than one inch.

(2) “Approved backflow prevention assembly” or “backflow assembly” or “assembly” means an assembly to counteract back pressures or prevent backsiphonage. This assembly must appear on the list of approved assemblies issued by the Washington State Department of Health.

(3) “Auxiliary supply” means any water source or system other than the town of Cathlamet water.

(4) “Backflow” means the flow of water or other liquids, gases or solids from any source back into the distribution system. The flow of water in the opposite direction of its intended flow.

(5) “Backflow assembly tester” means a person holding a valid BAT certificate issued in accordance with the WAC.

(6) “Backpressure” means a pressure caused by a pump, elevated tank or piping, boiler, or other means that is greater than the pressure provided by the public water system and which may cause backflow.

(7) “Backsiphonage” shall mean backflow due to a reduction in system pressure in the purveyor’s distribution system and/or consumer’s water system.

(8) “Building inspector” shall mean the building inspector for the town of Cathlamet.

(9) “Cathlamet” shall mean the town of Cathlamet.

(10) “Closed system” means any water system or portion of a water system in which water is transferred to a higher pressure zone closed to atmosphere.

(11) “Contamination” means the entry into or presence in a public water supply system of any substance which may be deleterious to health and/or quality of the water.

(12) “Cross connection” means any physical arrangement where a public water system is connected, directly or indirectly (actual or potential), with any other nondrinkable water system or auxiliary system, sewer, drain conduit, swimming pool, storage reservoir, plumbing fixture, swamp coolers, or any other device which contains, or may contain, contaminated water, sewage, or other liquid of unknown or unsafe quality which may be capable of imparting contamination to the public water system as a result of backflow. Bypass arrangements, jumper connections, removable sections, swivel or changeover devices, or other temporary or permanent devices through which, or because of which, backflow may occur are considered to be cross connections.

(13) “Cross connection specialist” or “CCS” shall mean a person holding a valid CCS certificate issued in accordance with the WAC.

(14) “Cross connection control manager” means a person or his/her designee appointed to manage the cross connection control program for the town.

(15) “Degree of hazard” means the low or high hazard classification that shall be attached to all actual or potential cross connections.

(16) “DOH” means Washington Department of Health.

(17) “Double check detector assembly” or “DCDA” means an assembly which consists of two independently operating check valves which are spring-loaded or weighted. The assembly comes complete with a shut-off valve on each side of the checks, as well as test cocks to test the checks for tightness. It shall also be provided with a factory bypass feature of a minimum of an approved double check assembly.

(18) “Double check valve backflow prevention assembly” or “double check assembly” or “double check” or “DCVA” or “DC” means an assembly which consists of two independently operating check valves which are spring-loaded or weighted. The assembly comes complete with a shut-off valve on each side of the checks, as well as test cocks to test the checks for tightness.

(19) “Health hazard” means an actual or potential threat of contamination of a physical, toxic or biological nature that would be a danger to health.

(20) “High hazard” means the classification assigned to an actual or potential cross connection that potentially could allow a substance that may cause illness or death to backflow into the potable water supply.

(21) “In-premises protection” means a method of protecting the health of consumers served by the customer’s plumbing system (i.e., located within the property lines of the customer’s premises) by the installation of an approved air gap or backflow prevention assembly at the point of hazard.

(22) “Inspector” or “surveyor” shall mean a person holding a valid CCS certificate issued in accordance with the WAC, who meets the stipulations in this title and the most recent edition of the town’s SOP manual.

(23) “Local administrative authority” means the local official, board, department or agency authorized to administer and enforce the provisions of the Uniform Plumbing Code and all other plumbing codes recognized by the state of Washington.

(24) “Low hazard” means the classification assigned to an actual or potential cross connection that potentially could allow a substance that may be objectionable, but not hazardous to one’s health, to backflow into the potable water supply.

(25) “Mobile unit” shall mean units connecting to the water system through a hydrant, hose bib, or other appurtenance of a permanent nature that is part of the town water system or a permanent water service to a premises. Examples can include but are not limited to the following: water trucks, pesticide applicator vehicles, chemical mixing units or tanks, waste or septage haulers, trucks or units, sewer cleaning equipment, carpet or steam cleaning equipment other than homeowner use, rock quarry or asphalt/concrete batch plants, or any other mobile equipment or vessel. Uses that are excluded from this definition are recreational vehicles at assigned sites or parked in accordance with other town ordinances pertaining to recreational vehicles, and homeowner devices that are used by the property owner in accordance with other provisions of this, or other, town of Cathlamet ordinances pertaining to provision of water service to premises.

(26) “Person” means a natural person (individual), corporation, company, association, partnership, firm, limited liability company, joint venture company or association, and other such entity.

(27) “Plumbing hazard” means an internal or plumbing-type cross connection in a consumer’s potable water system that may be either a pollutional or a contamination-type hazard. This includes, but is not limited to, cross connections to toilets, sinks, lavatories, wash trays, domestic washing machines and lawn sprinkling systems. Plumbing-type cross connections can be located in all types of structures including but not limited to homes, apartment houses, hotels and commercial or industrial establishments.

(28) “Point-of-use isolation” shall mean the same as “in-premises protection.”

(29) “Pollutional hazard” means an actual or potential threat to the physical properties of the water system or the potability of the public or the consumer’s potable water system but which would not constitute a health or system hazard, as defined. The maximum degree of intensity of pollution to which the potable water system could be degraded under this definition would cause a nuisance or be aesthetically objectionable or could cause minor damage to the system or its appurtenances.

(30) “Potable water supply” means any system of water supply intended or used for human consumption or other domestic use.

(31) “Premises” means any piece of property to which water is provided including, but not limited to, all improvements, mobile structures and structures located on it.

(32) “Premises isolation” means a method of protecting a public water system by installation of an approved air gap or approved backflow prevention assembly at the point of service (end of purveyor’s service pipe) to separate the customer’s plumbing system from the purveyor’s distribution system.

(33) “Reduced pressure principle backflow prevention assembly” or “reduced pressure principle assembly” or “RP assembly” shall mean an assembly containing two independently acting approved check valves together with a hydraulically operated, mechanically independent pressure differential relief valve located between the check valves and at the same time below the first check valve. The assembly shall include properly located test cocks and tightly closing shut-off valves at each end of the assembly.

(34) “SOP” means the most recent edition of the town of Cathlamet’s standard operating procedures manual.

(35) “Superintendent” means public works superintendent of the town of Cathlamet or his/her designee.

(36) “System hazard” means an actual or potential threat of severe danger to the physical properties of the public or consumer’s potable water system or of a pollution or contamination which would have a detrimental effect on the quality of the potable water in the system.

(37) “Thermal expansion” means the pressure created in piping, when water is heated.

(38) “Town” or “the town” shall mean the town of Cathlamet, Washington.

(39) “UPC” means Uniform Plumbing Code.

(40) “Used water” means any water supplied by the town to a customer’s property after it has passed through the service connection and is no longer under the control of the town.

(41) “WAC” means all regulations and amendments found in the most recent edition of the Washington Administrative Code which pertain to backflow and cross connections. (Ord. 550 § 2, 2012)