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 as an additional source by the Water
Purveyor and is satisfactory to the public health agency having jurisdiction
with regard to quality and safety or the auxiliary water supply is properly
abandoned.
[Amended 5-13-1991 by L.L.
No. 8-1991]
B.
Each service connection from a public water system for
supplying water to premises, on which any substance other than the supplied
water 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.
[Amended 5-13-1991 by L.L.
No. 8-1991]
C.
Each service connection from a public water system for
supplying water to premises on which any substance that is unusually toxic
or a danger to human health is or may be handled in liquid form, or in solid
or gaseous form if such substance is intended to be used after conversion
to liquid form, even if such substance is not under pressure, shall be protected
against backflow of the water from the premises into the public water system.
Examples of such premises include, but are not limited to, plating factories,
premises on which cyanide is handled and hospitals. This subsection is not
intended to apply to normal residential installations.
[Amended 5-13-1991 by L.L.
No. 8-1991]
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.
It shall be the responsibility of the water user to provide
and maintain these protective devices, and each one must be of a type acceptable
to the State Health Department.
The protective device required shall depend on the degree of hazard
as tabulated below:
A.
At the service connection to any premises where there
is an approved auxiliary water supply handled in a separate piping system
with no known cross-connection, the public water supply shall be protected
by an approved double check valve assembly.
[Amended 5-13-1991 by L.L.
No. 8-1991]
B.
At the service connection to any premises on which there
is an auxiliary water supply where cross-connections are known to exist which
cannot be presently eliminated, or where the auxiliary water supply is not
approved, the public water supply system shall be protected by an air gap
separation or an approved reduced pressure principle backflow prevention device.
[Amended 5-13-1991 by L.L.
No. 8-1991]
C.
At the service connection to any premise on which a substance
that would be objectionable (but not necessarily 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 each service connection from a public water system
for supplying water to premises on which any substance that is unusually toxic
or a danger to human health is or may be handled in liquid form, or in solid
or gaseous form if such substance is intended to be used after conversion
to liquid form, even if it is 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.
[Amended 5-13-1991 by L.L.
No. 8-1991]
E.
At each service connection from a public water system
for supplying water to premises on which any substance that is unusually toxic
or dangerous to human health is or may be handled under pressure, the public
water supply shall be protected by an air-gap separation or an approved reduced
pressure principle backflow prevention device. The air gap shall be located
as close as practicable to the water meter, and 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 an approved
reduced pressure principle backflow prevention device, providing the alternative
is acceptable to the Water Purveyor.
[Amended 5-13-1991 by L.L.
No. 8-1991]
F.
At the service connection to any sewage treatment plant
or sewage pumping station, 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 be reasonably met, the
public water supply shall be protected with an approved reduced pressure principle
backflow prevention device.
