For the purposes of this subchapter, unless the context requires otherwise, the following definitions, in addition to those in 75-6-102, MCA, apply:
- (1) "Approved backflow prevention assembly or device" means an assembly or device approved by the department.
- (2) "Back pressure" means any increase of water pressure in the downstream piping system above the supply pressure at a point where backflow could occur.
- (3) "Back siphonage" means a form of backflow caused by a reduction in supply pressure which causes a negative or sub-atmospheric pressure to exist in the water system.
- (4) "Backflow" means the undesirable reversal of water flow or the reversal of water flow containing other liquids, gases or other substances from a connected source that flows into the distribution pipes of the public water supply system.
- (5) "Backflow prevention assembly" means an apparatus that consists of a backflow prevention device, two shutoff valves, and appropriate test ports.
- (6) "Backflow prevention device" means an apparatus designed to prevent backflow.
- (7) "Certified backflow prevention assembly tester" means a person who holds a current certificate issued by a certification program of any state authorizing the person to test backflow prevention assemblies or who holds a current certificate from the American Society of Sanitary Engineers or the American Backflow Prevention Association.
- (8) "Cross-connection" is defined in 75-6-102, MCA.
- (9) "Degree of hazard" means the level of risk created by either a pollutant (non-health hazard) or a contaminant (health hazard), as derived from an assessment of the materials that may come in contact with the distribution system through a cross-connection.
- (10) "Health hazard" means a condition that causes or creates a potential for water contamination that may cause disease or have other physical or toxic effects on humans.
- (11) "Non-health hazard" means a condition that causes or creates a potential for water quality degradation but does not constitute a health hazard.
Authorizing statute(s): 75-6-104, MCA
Implementing statute(s): 75-6-104, MCA
History: NEW, 1998 MAR p. 958, Eff. 4/17/98; AMD, 2012 MAR p. 1141, Eff. 6/8/12; AMD, 2024 MAR p. 253, Eff. 2/10/24.