The purpose of this chapter is to:
A. Protect the public potable water supply of the Village of Dansville,
Livingston County, New York, from 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; and
B. Comply
with the requirements of the New York State Sanitary Code 5-1.31.
The Village of Dansville Water Superintendent shall be responsible
for the protection of the Village of Dansville distribution system
from contamination due to the backflow of contaminants through the
water service connection. If in the judgment of said Superintendent,
an acceptable backflow prevention device is required at the Village's
water service connection to any customer's premises for the safety
of the water system, the Superintendent or his 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 chapter, 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 device 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 good-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 supple pipe, measured vertically, above the top of the rim
of the vessel; and, in no case less than one inch.
APPROVED
Accepted by the Village of Dansville Superintendent as meeting
an applicable specification stated or cited in this chapter, or as
suitable for the purposed use.
AUXILIARY WATER SUPPLY
Any water supply on or available to the premises other than
the Village of Dansville's approved public water supply. These
auxiliary waters may include water from another purveyor's public
potable water supply or any natural source(s) such as a well, spring,
river, stream, harbor, etc., or used 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 pipes of the Village of Dansville 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 Village of
Dansville supply system throughout a customer's facility. The
system shall include all those parts of the piping beyond the control
point of the Village water systems. The control point is either the
curb value or the main valve located in the public right-of-way that
isolates the customer's facilities from the Village 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
water tightness of each 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: laboratories,
sewage treatment plant, chemical plants, hospitals, mortuaries.
NONHAZARDOUS FACILITY
One which does not require the installation of an acceptable
backflow prevention device.
PUBLIC WATER SUPPLY SYSTEM
The entire Village of Dansville water system including the
source, treatment works, 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
checks 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 device shall be fitted with properly located
test cocks.
SUPERINTENDENT
The Superintendent of Public Works of the Village of Dansville.