The
following definitions shall apply in the interpretation and enforcement
of this Chapter:
AIR-GAP SEPARATION
An unobstructed gap between the supply pipe or faucet and the receiving tank, plumbing fixture or other device and which meets the requirements of the Department. The gap shall be at least two (2) times the diameter of the supply pipe measured vertically above the overflow rim level of the receptacle, but in no case less than one (1) inch. (See Section
710.060 Backflow Prevention Assembly Standards.)
AUXILIARY WATER SUPPLY
Any water source or system, other than the water distribution
system, that may be available in the building or premises.
BACKFLOW
The flow, other than in the intended direction of flow, of
any foreign liquids, gases or substances into the water distribution
system.
BACKFLOW HAZARD
Any hazard which could occur due to either an existing or
potential backflow of contaminated water or non-potable water into
the water distribution system.
1.
Class I Backflow Hazard — A backflow
hazard which presents an immediate or potential health hazard to customers
of the water distribution system should backflow occur.
2.
Class II Backflow Hazard — A backflow
hazard which would threaten to degrade the water quality of the water
distribution system should backflow occur.
BACKFLOW PREVENTION ASSEMBLY
Any device, method or type of construction intended to prevent backflow into a potable water system, and which meets the requirements of the Department. (See Section
710.060 Backflow Prevention Assembly Standards.)
BACKFLOW PREVENTION ASSEMBLY TESTER — CERTIFIED
A person who has proven his/her competency to the satisfaction
of the Department. Each person who is certified to make competent
tests or to repair, overhaul and make reports on backflow prevention
assemblies shall be conversant with applicable laws, rules and regulations
and have had experience in plumbing or pipe fitting or have other
qualifications which, in the opinion of the Department, are equivalent.
BYPASS
Any system or arrangement of piping whereby the water may
be diverted around all or any part of a backflow prevention assembly.
CONTAINMENT
Protection of the water distribution system, by installing
a Department approved backflow prevention assembly or air-gap separation
on the main service line to a facility.
CONTAMINATION
An impairment of the quality of the water by sewage, wastes,
process fluids, chemicals or substances to a degree which could create
an actual hazard to the public health through poisoning or through
spread of disease by exposure.
CROSS-CONNECTION
Any physical link, actual or potential, between a potable
water supply and any other substance, fluid or source, which makes
possible contamination of the potable water supply due to the reversal
of flow of the water in the piping or distribution system. Bypass
arrangements, jumper connections, removable sections, swivel or changeover
devices and other temporary or permanent devices through which or
because of which backflow can or may occur are considered to be cross-connections.
CUSTOMER
The owner or person in control of any facility supplied by
or in any manner connected to the water distribution system.
DEPARTMENT
The Missouri Department of Natural Resources, its employees
or authorized representatives.
DOUBLE-CHECK-DETECTOR CHECK ASSEMBLY
An assembly, approved by the Department, which includes a main line assembly composed of two (2) single, independently acting, internally loaded check valves, including tightly closing shut-off valves located at each end of the assembly and fitted with properly located test cocks. In addition, the bypass line assembly shall be composed of a water meter in series with a double-check valve assembly. The meter, nominally three-fourths (¾) inch size, is for detection of leaks and unauthorized water uses and will accurately register flows of between one (1) and twenty (20) gpm flow rates. The double-check valve assembly located in the bypass line has a static pressure drop which is approximately two (2) psi less than the mainline check valves, resulting in all flows up to about ten (10) gpm to be registered by the meter. The meter installed on the assembly shall only be one that has been specifically approved and matched with the assembly, by the Department, for this use. (See Section
710.060 Backflow Prevention Assembly Standards.)
DOUBLE-CHECK VALVE ASSEMBLY
An assembly, approved by the Department, which is composed of two (2) single, independently acting, internally loaded check valves, including tightly closing shut-off valves located at each end of the assembly and fitted with properly located test cocks. (See Section
710.060 Backflow Prevention Assembly Standards.)
FACILITY
Any structure, building, hydrant, piping system or other
device, owned by a customer, which is supplied potable water from
the Water Purveyor.
HAZARD, DEGREE OF
An evaluation of the potential risk to public health and
the adverse effect of the hazard upon the potable water system.
1.
Hazard, Health: Any condition, device or practice
in the water supply system and its operation which could or may create
a danger to the health and well-being of any customer.
2.
Hazard, Plumbing: A plumbing type cross-connection
in a customer's potable water system that has not been properly protected
by a vacuum breaker, air-gap separation or backflow prevention device.
3.
Hazard, Pollutional: An actual or potential
threat to the physical properties of the water distribution system
or the potability of the Water Purveyor's or the customer's potable
water system, but which would constitute a nuisance or be aesthetically
objectionable or could cause damage to the system or its appurtenances,
but would not be dangerous to health.
4.
Hazard, System: An actual or potential threat
of severe damage to the physical properties of the potable water system
of the Water Purveyor or the customer, or of a pollution or contamination
which would have a protracted effect on the quality of the potable
water in the system.
INDUSTRIAL PROCESS SYSTEM
Any system containing a fluid or solution which may be chemically,
biologically or otherwise contaminated or polluted in a form or concentration
such as would constitute a health, system, pollutional or plumbing
hazard if introduced into a potable water supply.
ISOLATION
Protection of a customer's potable water system, within his/her
premises, by installing a Department approved backflow prevention
assembly or air-gap separation on an individual fixture, appurtenance
or system.
PERSON
Any individual, partnership, co-partnership, firm, company,
public or private corporation, association, homeowners' association,
joint stock company, trust, estate, political subdivision, or any
agency, board, department or bureau of the State or Federal Government,
or any other legal entity whatever which is recognized by law as the
subject of rights and duties.
POLLUTION
The presence of any foreign substance (organic, inorganic
or biological) in water which tends to degrade its quality so as to
constitute a hazard or impair the usefulness of the water to a degree
which does not create an actual hazard to the public health but which
does adversely and unreasonably affect such waters for domestic use.
POTABLE
Any water which is satisfactory for drinking, culinary and
domestic purposes and which meets the requirements of the Department.
For the purposes of this Chapter, all water supplied by the Water
Purveyor meets these requirements.
PREMISES
The land, real estate or building, owned or occupied by a
customer, having any facility which is supplied water from the Water
Purveyor.
PRESSURE TYPE VACUUM BREAKER ASSEMBLY
A device, approved by the Department, which is composed of
a spring loaded check valve which closes tightly when the pressure
of the device drops below one (1) psi or when zero (0) flow occurs.
An air inlet port that opens to break a siphon when the pressure in
the device drops to one (1) psi is located above the line check valve.
This device shall only be installed where back pressure will not occur
and shall be installed above the highest fixture served.
REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTION ASSEMBLY
A device, approved by the Department, containing two (2) independently acting, internally loaded check valves together with a hydraulically operating, mechanically independent pressure relief valve located between the check valves and at the same time below the first (1st) check valve. The unit shall include properly located test cocks and tightly closing shut-off valves at each end of the assembly. (See Section
710.060 Backflow Prevention Assembly Standards.)
SERVICE CONNECTION
The terminal end of a water service line or pipe which is
connected to the Water Purveyor's water distribution system, for the
purpose of conveying water to a point of use, for potable and/or fire
protection purposes.
WATER DISTRIBUTION SYSTEM
All piping, conduits, valves, hydrants, storage facilities,
pumps and other appurtenances, excluding service connections, which
serve to deliver water from a water treatment plant or water supply
source to the public. For the purposes of this Chapter, only that
system which is owned and/or operated by the Water Purveyor shall
be considered as the water distribution system.
WATER PURVEYOR
The owner, operator or individual in responsible charge of
a public water system.