As used in this article, the following definitions
shall apply:
AGENCY
The Department of Public Works.
AIRGAP
The unobstructed vertical distance through the free atmosphere
between the lowest opening from any pipe or faucet supplying water
to a tank, plumbing fixture or other device and the flood-level rim
of the receptacle.
APPROVED
Accepted by the agency as meeting an applicable specification
stated or cited in this article, or as suitable for the proposed use.
AUXILIARY SUPPLY
Any water source or system other than the potable water supply
that may be available in the building or premises.
BACKFLOW
The flow of water or other liquids, mixtures or substances
into the distributing pipes of a potable supply of water from any
source or sources other than its intended source. Backsiphonage is
one type of backflow.
BACKSIPHONAGE
Backflow resulting from negative pressures in the distributing
pipes of a potable water supply.
BAROMETRIC LOOP
A loop of pipe rising at least 35 feet, at its topmost point,
above the highest fixture it supplies.
CHECK VALUE
A self-closing device which is designed to permit the flow
of fluids in one direction and to close if there is a reversal of
flow.
CROSS-CONNECTION
Any physical connection between a potable water supply and
any waste pipe, soil pipe, sewer, drain or any unapproved source or
system. Furthermore, it is any potable water supply outlet which is
submerged or can be submerged in wastewater and/or any other source
of contamination. (See "backflow" and "backsiphonage.")
DRAIN
Any pipe that carries wastewater or waterborne wastes in
a building drainage system.
FIXTURE, PLUMBING
Installed receptacles, devices or appliances supplied with
water or that receive or discharge liquids or liquidborne wastes.
HAZARD, HEALTH
Any conditions, devices or practices in the water supply
system and its operation which create, or, in the judgment of the
Director, may create a danger to the health and well-being of the
water consumer. An example of a health hazard is a structural defect
in the water supply system, whether of location, design or construction,
that regularly or occasionally may prevent satisfactory purification
of the water supply or cause it to be polluted from extraneous sources.
HAZARD, PLUMBING
Any arrangement of plumbing, including piping and fixtures
whereby a cross-connection is created.
HYDROPNEUMATIC TANK
A pressure vessel in which air pressure acts upon the surface
of the water contained within the vessel, pressurizing the water distribution
piping connected to the vessel.
INLET
The open end of the water supply pipe through which the water
is discharged into the plumbing fixture.
PLUMBING SYSTEM
Includes the water supply and distribution pipes, plumbing
fixtures and traps; soil, waste and vent pipes; building drains and
building sewers, including their respective connections, devices and
appurtenances within the property lines of the premises; and water-treating
or water-using equipment.
POLLUTION
The presence of any foreign substance (organic, inorganic,
radiological or biological) in water that tends to degrade its quality
so as to constitute a hazard or impair the usefulness of the water.
SURGE TANK
The receiving, nonpressure vessel forming part of the airgap
separation between a potable and an auxiliary supply.
VACUUM
Any pressure less than that exerted by the atmosphere.
WATER, POTABLE
Water free from impurities in amounts sufficient to cause
disease or harmful physiological effects. Its bacteriological and
chemical quality shall conform to the requirements of the Public Health
Service Drinking Water Standards or to the regulations of the public
health authority having jurisdiction.
WATER, NONPOTABLE
Water that is not safe for human consumption or that is of
questionable potability.