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Sec. 23-31.  Definitions.
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For the purpose of this article and these regulations, the following definitions shall apply unless the context clearly indicates or requires a different meaning, namely.

Air gap means an unobstructed vertical distance through atmosphere between the discharge end of a pipeline supplied from a public water supply and the overflow rim of the receiving portion of the customer water system.

Backflow means the flow of water or contaminants into the public water supply distribution system from a source other than the public water supply.

Booster pump means a pump installed on a pipeline to increase water pressure or flow.

Commissioner means the commissioner of the Indiana department of environmental management ("IDEM"), or the commissioner's authorized representative.

Cross connection means any physical arrangement, including cross connection control devices not in working order, whereby a public water supply distribution system is directly connected, either continuously or intermittently, with any secondary source of supply, sewer, drain, conduit, pool, piping, storage reservoir, plumbing fixture, or other device which contains, or may contain, and is capable of imparting to the public water supply, contaminants, contaminated water, sewage, or other waste or liquid of unknown or unsafe quality.

Cross connection control device means any device or assembly, approved by the commissioner for construction on or installation in water supply piping, which is capable of preventing contaminants from entering the public water supply distribution system.

Cross connection control device inspector means a person who has:

1. Successfully completed training in testing and inspection of cross connection control devices from a training provider approved by the commissioner;

2. Received a registration number from the commissioner; and

3. Not been notified by the commissioner that the registration number has been revoked.

Cross connection hazard means any customer facility which, because of the nature and extent of activities on the premises or the materials used in connection with the activities or stored on the premises, would present an immediate or potential danger or health hazard to customers of the public water supply should backflow occur.

Customer means any person who receives water from the Town Waterworks District public water supply.

Customer service line means the pipeline from the public water supply to the:

1. First tap, fixture, receptacle, or other point of customer water use; or

2. Secondary source of supply or pipeline branch in a building.

Customer water system means all piping, fixtures, and appurtenances, including secondary sources of supply, used by a customer to convey water on his premises.

Double check valve assembly means a device or assembly composed of two (2) tightly closing shutoff valves surrounding two (2) independently acting check valves, with four (4) test cocks, one upstream of the four (4) valves and one between each of the four (4) check and shutoff valves.

Downstream means the direction of flow when only the public water supply is supplying water through the customer water system and backflow is not occurring.

Pressure vacuum breaker means a device or assembly containing an independently operating internally loaded check valve and an independently operating loaded air inlet valve located on the downstream side of the check valve for relieving a vacuum or partial vacuum in a pipeline.

Private water supply system means the lateral fire and service line to the customer's premises starting at the roundway (buffalo box) on the service line and terminating at the point of usage, whether for fire suppression, irrigation or domestic usage.

Public water supply system means a public water supply for the provision to the public of water for human consumption through pipes or other constructed conveyances and shall consist of the water mains and appurtenances such as fire hydrants and main valves used to distribute the potable water supply to the public, and shall terminate at the roundway (buffalo box) for lateral service to the user. The St. John Waterworks District and department of waterworks is the owner of the public water system.

Reduced pressure principle backflow preventer means a device composed of two (2) tightly closing shutoff valves surrounding two (2) independently acting pressure reducing check valves that, in turn, surround an automatic pressure differential relief valve, and four (4) test cocks, one upstream of the five (5) valves and one between each of the four (4) check and shutoff valves. The check valves effectively divide the structure into three (3) chambers; pressure is reduced in each downstream chamber allowing the pressure differential relief valve to vent the center chamber to atmosphere should either or both check valves malfunction.

Secondary source of supply means any well, spring, cistern, lake, stream, or other water source, intake structure, pumps, piping, treatment units, tanks, and appurtenances used, either continuously or intermittently, to supply water other than from the public water supply to the customer, including tanks used to store water to be used only for firefighting, even though the water contained therein is supplied from the public water supply.

Upstream means the direction of flow opposite to downstream.

Utility means the Town Waterworks District, a municipally owned utility, governed by the board of commissioners of the St. John Waterworks District/department of waterworks.