For the purposes of this sub-chapter,
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
included in the "List of Approved Backflow Prevention Assemblies",
incorporated by reference in ARM 17.38.302.
(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, American backflow
prevention association, foundation for cross-connection control and
hydraulic research, or American water works association.
(8) "Cross-connection"
is defined in 75-6-102, MCA.
(9) "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.
(10) "Water pollution
hazard" means a condition that causes or creates a potential for water
quality degradation but does not constitute a health hazard.