[Adopted 1-5-1995 by L.L.
No. 1-1995]
The purpose of this article is to:
A. Protect the public potable water supply of the Town of
Livonia, Livingston County, New York from the possibility of contamination
by isolating within its customers' internal distribution system(s) or its
customers' private water system(s) such contaminations or pollutants which
could backflow into the public water system.
B. Comply with the requirements of the New York State Sanitary
Code 5-1.31.
The Town of Livonia Water Department shall be responsible for the protection
of the Town of Livonia distribution system from contamination due to the backflow
of contaminants through the water service connection. If, in the judgment
of said Water Department, an acceptable backflow prevention device is required
at the town's water service connection to any customer's premises for the
safety of the water system, the Water Department or their designated agent
shall give notice, in writing, to said customer to install such an acceptable
backflow prevention device at each service connection to this premises. The
customer shall immediately install such approved device or devices at his
own expense; and failure, refusal or inability on the part of the customer
to install said device or devices immediately shall constitute a ground for
discontinuing water service to the premises until such device or devices have
been properly installed.
As used in this article, the following terms shall have the meanings
indicated:
ACCEPTABLE BACKFLOW PREVENTION DEVICE
An acceptable air gap, reduced pressure zone device or double check
valve assembly as used to contain potential contamination within a facility.
In order for the reduced pressure zone or the double check valve assembly
to be acceptable, it must be listed on the most current version of the New
York State Department of Health List of Acceptable Devices.
AESTHETICALLY OBJECTIONABLE FACILITY
One in which substances are present which, if introduced into the
public water supply system, could be a nuisance to other water customers but
would not adversely affect human health. Typical examples of such substances
are food-grade dyes, hot water, stagnant water from fire lines in which no
chemical additives are used, etc.
AIR GAP
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 said vessel. An approved
air gap shall be at least double the diameter of the supply pipe, measured
vertically, above the top of the rim of the vessel and in no case less than
one inch.
APPROVED
Accepted by the Town of Livonia Water Department as meeting an applicable
specification stated or cited in this article or as suitable for the proposed
use.
AUXILIARY WATER SUPPLY
Any water supply on or available to the premises other than the Town
of Livonia's approved public water supply. These auxiliary waters may include
water from another purveyor's potable water supply or any natural source(s),
such as a well, spring, river, stream, lake or pond, etc., or use waters.
These waters may be contaminated or they may be objectionable and constitute
an unacceptable water source over which the water purveyor does not have sanitary
control.
BACKFLOW
A flow condition, induced by a differential in pressure, that causes
the flow of water or other liquids and/or gases into the distribution pipe
of the Town of Livonia supply system from any source other than its intended
source.
CERTIFIED TESTER
That individual or firm approved to accomplish the necessary inspections
and operational tests of backflow prevention devices.
CONTAMINATION
The presence in water of a substance that tends to degrade its quality.
CUSTOMER
A water user served by the supply system.
CUSTOMER'S WATER SYSTEM
The piping used to convey water supplied by the Town of Livonia's
supply system throughout a customer's facility. The system shall include all
those parts of the piping beyond the control point of the Town Water Systems.
The control point is either the curb valve or the main valve located in the
public right of way that isolates the customer's facilities from the town
distribution system.
DEGREE OF HAZARD
Whether a facility is rated as hazardous, aesthetically objectionable
or nonhazardous.
DOUBLE CHECK VALVE ASSEMBLY, ACCEPTABLE
An assembly composed of two single, independently acting check valves,
including tightly closing shutoff valves located at each end of the assembly,
and suitable connections for testing the watertightness of each check valve.
HAZARDOUS FACILITY
One in which substances may be present which, if introduced into
the public water system, would or may endanger or have an adverse effect on
the health of other water customers. Typical examples include laboratories,
sewage treatment plants, chemical plants, hospitals and mortuaries.
NONHAZARDOUS FACILITY
One which does not require the installation of an acceptable backflow
prevention device.
PUBLIC WATER SUPPLY SYSTEM
The entire Town of Livonia system (Hemlock, Livonia Center, South
Livonia, Lakeville Water Districts), including the source, transmission mains,
distribution system and storage facilities serving the public. This includes
the distribution system up to its connection with the customer's water system.
REDUCED PRESSURE ZONE DEVICE, ACCEPTABLE
A device containing a minimum of two independently acting check valves,
together with an automatically operated pressure differential relief valve
located between the two check valves. During normal flow and at the cessation
of normal flow, the pressure between these two check valves shall be less
than the supply pressure. In case of leakage of either check valve, the differential
relief valve, by discharging to the atmosphere, shall operate to maintain
the pressure. The unit must include tightly closing shutoff valves located
at each end of the device, and each device shall be fitted with properly located
test cocks.
WATER DEPARTMENT
Licensed water operators or Town Engineer of the Town of Livonia.