A.
Each service connection from a public water system for
supplying water to premises having an auxiliary water supply shall be protected
against backflow of water from the premises into the public water system,
unless the auxiliary water supply is approved and monitored as an additional
source by the water purveyor and is satisfactory to the public health agency
having jurisdiction with regard to quality and safety.
B.
Each service connection from a public water system for
supplying water to premises, on which any substance is handled under pressure
in such fashion as to permit entry into the water system, shall be protected
against backflow of the water from the premises into the public system. This
shall include the handling of process waters and waters originating from the
public water supply system which may have been subject to deterioration in
sanitary or chemical quality.
C.
Each service connection from a public water system for
supplying water to premises on which a substance of unusually toxic concentration
or danger to health is handled in liquid form, even though it is not under
pressure, shall be protected against backflow of the water from premises into
the public system. Examples may include plating factories using cyanide and
hospitals. This is not intended to apply to normal household installations.
D.
Backflow prevention devices shall be installed on the
service connection to any premises that have internal cross-connections, unless
such cross-connections are abated to the satisfaction of the water purveyor.
E.
All fires occurring and requiring fire-fighting apparatus
to be connected to fire hydrants must use soft suction hose to make the connection.
F.
It shall be the responsibility of the water user to provide
and maintain these protective devices, and each one must be of a type and
installation acceptable to the State Health Department.
The protective device required shall depend on the degree of hazard
as indicated below:
A.
At the service connection to any premises where there
is an auxiliary water supply handled in a separate piping system with no cross-connection,
the public water supply shall be protected by an approved backflow prevention
device.
B.
At the service connection on any premises on which there
is an auxiliary water supply where cross-connections are known to exist which
cannot be presently eliminated, the public water supply system shall be protected
by an air-gap separation or an approved reduced pressure principle backflow
prevention device.
C.
At the service connection to any premises on which a
substance that would be objectionable (but not hazardous to health if introduced
into the public water supply) is handled so as to constitute a cross-connection,
the public water supply shall be protected by an approved double check valve
assembly.
D.
At the service connection to any premises on which a
substance of unusual toxic concentration or danger to health is or may be
handled, but not under pressure, the public water supply shall be protected
by an air-gap separation or an approved reduced pressure principle backflow
prevention device. This device shall be located as close as practicable to
the water meter, and all piping between the water meter and receiving tanks
shall be entirely visible.
E.
At the service connection to any premises on which any
material dangerous to health, or toxic substance in toxic concentration, is
or may be handled under pressure, the public water supply shall be protected
by an air-gap separation. The air-gap shall be located as close as practicable
to the water meter, and all piping between the water meter and receiving tanks
shall be entirely visible. If these conditions cannot reasonably be met, the
public water supply shall be protected with a reduced pressure principle backflow
prevention device, providing the alternative is acceptable to the water purveyor.
F.
At the service connection to any sewage treatment plant
or sewage pumping station, the public water supply shall be protected with
an approved reduced pressure principle backflow prevention device.
A.
It shall be the duty of the water user on any premises
on account of which backflow protective devices are installed, to have competent
inspections made at least once a year, or more often in those instances where
successive inspections indicate repeated failure. These devices shall be repaired,
overhauled or replaced at the expense of the water user whenever they are
found to be defective. These tests shall be performed by a qualified backflow
prevention device tester, and all test results will be provided to the water
purveyor within 72 hours after the test is made.
B.
Records of such test, repairs, and overhaul shall also
be kept and made available to the water purveyor and the local Health Department
upon request.
