[Ord. No. 1308 §3-1, 3-19-2001]
A. The
purpose of this Section is to:
1. Protect the public potable water supply from contamination or pollution
by containing within the consumer's internal distribution system(s)
or private water system(s) such contaminants or pollutants which could
backflow through the service connection into the public potable water
supply system.
2. Promote the elimination, containment, isolation or control of existing
cross-connections, actual or potential, between the public or consumer's
potable water system and non-potable water systems, plumbing fixtures
and industrial-process systems.
3. Provide for the maintenance of a continuing program of cross-connection
control which will systematically and effectively prevent the contamination
or pollution of all potable water systems.
[Ord. No. 1308 §3-2, 3-19-2001]
The following words, terms and phrases, when used in this Article,
shall have the meanings ascribed to them in this Section, except where
the context clearly indicates a different meaning:
AUXILIARY WATER SUPPLY
Any water source or system, other than the City's approved
public water supply, that may be available in the building or premises.
BACKFLOW
The flow, other than the intended direction of flow, of any
foreign liquids, gases or substances into the distribution system
of a public water supply.
BACKFLOW PREVENTION ASSEMBLY
An assembly or means assigned to prevent backflow and shall
be of a model or construction approved by the City and the Missouri
Department of Natural Resources. Four (4) common types of backflow
prevention assemblies are:
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AIR-GAP SEPARATION — The unobstructed vertical distance
through the free atmosphere between the lowest opening from any pipe
or faucet conveying water or waste to a tank, plumbing fixture, receptor
or other assembly and the flood level rim of the receptacle. These
vertical, physical separations must be at least twice the diameter
of the water supply outlet but never less than one (1) inch (twenty-five
(25) mm).
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DOUBLE-CHECK VALVE ASSEMBLY — An assembly consisting of
two (2) internally spring loaded check valves, installed as a unit
between two (2) tightly closing resilient-seated shut-off valves and
fittings with properly located resilient-seated test cocks.
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DOUBLE-DETECTOR CHECK VALVE ASSEMBLY — A double-check
valve assembly with a water meter and double check in the by-pass
line.
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REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTION ASSEMBLY —
An assembly consisting of two (2) independently acting approved check
valves together with a hydraulically operating, mechanically independent
pressure differential relief valve located between the check valves
and below the first (1st) check valve. These units are located between
two (2) tightly closing resilient-seated shut-off valves as an assembly
and equipped with properly located resilient-seated test cocks.
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CITY
The City of Oak Grove, Missouri.
CONSUMER
The owner or person in control of any premises supplied by
or in any manner connected to a public water system.
CONTAINMENT
Protection of the public water supply by installing a backflow
prevention assembly on the main service line to a facility.
CONTAMINATION
An impairment of the quality of the water by any foreign
substance that degrades the quality of the potable water supply or
creates a health hazard.
CROSS-CONNECTION
Any physical link 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.
HAZARD, DEGREE OF
An evaluation of the potential risk to public health and
the adverse effect of the hazard upon the potable water system.
HAZARD, HEALTH
Any condition, device or practice in the water supply system
and its operation that could create or may create a danger to the
health and well-being of the water consumer.
HAZARD, PLUMBING
A plumbing type cross-connection in a consumer's potable
water system that has not been properly protected by a vacuum breaker,
air-gap separation or backflow prevention assembly.
HAZARD, POLLUTIONAL
An actual or potential threat to the physical properties
of the water system or to the potability of the public or the consumer'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.
HAZARD, SYSTEM
An actual or potential threat of severe damage to the physical
properties of the public potable water system or the consumer's potable
water system 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 facility's internal plumbing system by installing
a backflow prevention assembly, air-gap separation, or other backflow
prevention device on an individual fixture, appurtenance or system.
POLLUTION
Such contamination or other alteration of the physical, chemical
or biological properties of any waters of the State, including change
in temperature, taste, color, turbidity, or odor of the waters, or
such discharge of any liquid, gaseous, solid, radioactive, or other
substance into any waters of the State as will or is reasonably certain
to create a nuisance or render such waters harmful, detrimental or
injurious to public health, safety or welfare, or to domestic, industrial,
agricultural, recreational, or other legitimate beneficial uses, or
to wild animals, birds, fish or other aquatic life.
PUBLIC POTABLE WATER SYSTEM
Any publicly or privately owned water system supplying water
to the general public which is satisfactory for drinking, culinary
and domestic purposes and meets the requirements of the Missouri Department
of Natural Resources.
SERVICE CONNECTION
The terminal end of a service line from the public water
system. If a meter is installed at the end of the service, then the
service connection means the downstream end of the meter.
[Ord. No. 1308 §3-3, 3-19-2001]
A. This
Article shall apply to all premises served by the public potable water
system of the City and will be reasonably interpreted by the City.
It is the City's intent to recognize the varying degrees of hazard
and to apply the principle that the degree of protection required
shall be commensurate with the degree of hazard.
B. If,
in the judgment of the City, cross-connection protection is required
through either piping modification or installation of an approved
backflow prevention device, due notice shall be given to the consumer.
The consumer shall immediately comply by providing the required protection
at his/her own expense; failure, refusal or inability on the part
of the consumer to provide such protection shall constitute grounds
for discontinuing water service to the premises, as provided in this
Article, until such protection has been provided.
C. No
water service connection to any premises shall be installed or maintained
unless the water supply is protected as required by this Article.
Water service to any premises shall be discontinued by the City if
a backflow prevention assembly required by this Article is not installed,
tested and maintained, or if it is found that a backflow prevention
assembly has been removed, by-passed, or if an unprotected cross-connection
exists on the premises. Service will not be restored until such conditions
or defects are corrected.
[Ord. No. 1308 §3-4, 3-19-2001]
A. No
water service connection shall be installed or maintained to any premises
where actual or potential cross-connections to the public potable
or consumer's water system may exist unless such actual or potential
cross-connections are abated or controlled to the satisfaction of
the City.
B. No
connection shall be installed or maintained whereby an auxiliary water
supply may enter a public potable or consumer's water system unless
such auxiliary water supply and the method of connection and use of
such supply shall have been approved by the City.
C. No
water service connection shall be installed or maintained to any premises
in which the plumbing system, facilities and fixtures have not been
constructed and installed using acceptable plumbing practices determined
by the City to be necessary for the protection of health and safety.
[Ord. No. 1308 §3-5, 3-19-2001]
A. The
consumer's premises shall be open at all reasonable times for the
City to conduct surveys and investigations of water use practices
within the consumer's premises to determine whether there are actual
or potential cross-connections to the consumer's water system through
which contaminants or pollutants could backflow into the public potable
water system.
B. On
request by the City, the consumer shall furnish information on water
use practices within his/her premises.
C. It
shall be the responsibility of the consumer to conduct periodic surveys
of water use practices on his/her premises to determine whether there
are actual or potential cross-connections to his/her water system
through which contaminants or pollutants could backflow into his/her
or the public potable water system, to notify the City if such connections
are found to exist, and to make any repairs necessary to bring his/her
water system into compliance with the provisions of this Article.
[Ord. No. 1308 §3-6, 3-19-2001]
A. The
type of protection required by this Article shall depend on the degree
of hazard that exists, as follows:
1. An approved air-gap separation shall be installed where the public
potable water system may be contaminated with substances that could
cause a severe health hazard.
2. An approved air-gap separation or an approved reduced pressure principle
backflow prevention assembly shall be installed where the public potable
water system may be contaminated with a substance that could cause
a system or health hazard.
3. An approved air-gap separation or an approved reduced pressure principle
backflow prevention assembly or an approved double-check valve assembly
shall be installed where the public potable water system may be polluted
with substances that could cause a pollutional hazard not dangerous
to health.
[Ord. No. 1308 §3-7, 3-19-2001]
A. An
approved backflow prevention assembly shall be installed on each service
line to a consumer's water system serving premises where, in the judgment
of the City, actual or potential hazards to the public potable water
system exist. The type and degree of protection required shall be
commensurate with the degree of hazard, as determined by the City.
B. An
approved air-gap separation or reduced pressure principle backflow
prevention assembly shall be installed at the service connection or
within any premises where, in the judgment of the City, the nature
and extent of activities on the premises, or the materials used in
connection with the activities, or materials stored on the premises
would present an immediate and dangerous hazard to health should a
cross-connection occur, even though such cross-connection may not
exist at the time the backflow prevention device is required to be
installed. This includes, but is not limited to, the following situations:
1. Premises having an auxiliary water supply, unless the quality of
the auxiliary supply is acceptable to the City.
2. Premises having internal cross-connections that are not correctable
or intricate plumbing arrangements that make it impractical to ascertain
whether or not cross-connections exist.
3. Premises where entry is restricted so that inspection for cross-connections
cannot be made with sufficient frequency or at sufficiently short
notice to assure the cross-connections do not exist.
4. Premises having a repeated history of cross-connections being established
or re-established.
5. Premises which, due to the nature of the enterprise therein, are
subject to recurring modification or expansion.
6. Premises on which any substance is handled under pressure so as to
permit entry into the public water supply, or where a cross-connection
could reasonably be expected to occur. This shall include the handling
of process waters and cooling waters.
7. Premises where materials of a toxic or hazardous nature are handled
such that if backsiphonage or backpressure should occur, a serious
health hazard may result.
C. Facilities
representing Class I backflow hazards fall into one (1) or more of
the categories of premises where an approved air-gap separation or
reduced pressure principle backflow prevention assembly is required
by the City to protect the public water supply and must be installed
at these facilities unless all hazardous or potentially hazardous
conditions have been eliminated or corrected by other methods to the
satisfaction of the City. This includes, but is not limited to, the
following types of facilities:
1. Aircraft and missile manufacturing plants.
2. Automotive plants including those plants which manufacture motorcycles,
automobiles, trucks, recreational vehicles and construction and agricultural
equipment.
3. Potable water dispensing stations which are served by a public water
system.
4. Beverage bottling plants including dairies and breweries.
5. Canneries, packing houses and reduction plants.
7. Chemical, biological and radiological laboratories including those
in high schools, trade schools, colleges, universities and research
institutions.
8. Hospitals, clinics, medical buildings, autopsy facilities, morgues,
mortuaries, and other medical facilities.
9. Metal or plastic manufacturing, fabrication, cleaning, plating or
processing facilities.
10. Plants manufacturing paper and paper products.
11. Plants manufacturing, refining, compounding or processing fertilizer,
film, herbicides, natural or synthetic rubber, pesticides, petroleum
or petroleum products, pharmaceuticals, radiological materials or
any chemical which would be a contaminant to the public water system.
12. Commercial facilities that use herbicides, pesticides, fertilizers
or any chemical that would be a contaminant to the public water system.
13. Plants processing, blending or refining animal, vegetable or mineral
oils.
14. Commercial laundries and dye works.
15. Sewage, stormwater and industrial waste treatment plants and pumping
stations.
16. Industrial facilities which recycle water.
17. Restricted or classified facilities or other facilities closed to
the supplier of water or the department.
18. Fire sprinkler systems using any chemical additives.
20. Irrigation systems (including in-ground lawn sprinkler systems) with
facilities for injection of pesticides, herbicides or other chemicals
or with provisions for creating backpressure.
21. Portable tanks for transporting water taken from a public water system.
22. Facilities that have pumped or repressurized cooling or heating systems
that are served by a public water system, including all boiler systems.
D. Facilities
representing Class II backflow hazards fall into the category of premises
where an approved air-gap separation, reduced pressure principle backflow
prevention assembly, double detector check valve assembly or double-check
valve assembly is required by the City to protect the public water
supply and must be installed at these facilities unless all hazardous
or potentially hazardous conditions have been eliminated or corrected
by other methods to the satisfaction of the City. This includes, but
is not limited to, the following types of facilities:
1. Tanks to store water from the public water system for fire fighting
only, unless such tanks meet the requirements of the Missouri Department
of Natural Resources for construction to maintain bacteriological
quality of the water.
2. Irrigation systems (including in-ground lawn sprinkler systems) not
using chemical additives and with no provisions for creating backpressure.
3. Fire sprinkler systems not using chemical additives (double detector
check valve assembly required).
4. Fire lines (double detector check valve assembly required).
5. Swimming pools with a piped or permanent connection to the water
supply.
6. Cross-connections that could permit introduction of contaminants
into the public or customer water system and thereby create a nuisance,
be aesthetically objectionable or cause minor damage to the public
water system or its appurtenances.
[Ord. No. 1308 §3-8, 3-19-2001]
The owner of any premises with existing water service shall protect the public water system against backflow by installing an approved device commensurate with the degree of hazard in the service line in accordance with Section
700.250.
[Ord. No. 1308 §3-9, 3-19-2001]
All new water service connections shall protect the public water system against backflow by installing an approved device commensurate with the degree of hazard in the service line in accordance with Section
700.250. Major modifications or major additions to water systems shall be considered to be new service lines or systems for purposes of this Section.
[Ord. No. 1308 §3-10, 3-19-2001]
Existing backflow prevention assemblies approved by the City
at the time of installation and properly maintained shall, except
for inspection and maintenance requirements, be excluded from the
requirements of this Section so long as the City is assured and concludes
that these assemblies will satisfactorily protect the water system.
Whenever the existing assembly is moved from its present location,
or requires more than minimum maintenance, or when the City finds
that the maintenance constitutes a hazard to health, the unit shall
be replaced at the owner's expense by a backflow prevention assembly
meeting the requirements of this Article.
[Ord. No. 1308 §3-11, 3-19-2001]
A. The
discharge pipe of an air gap shall terminate a minimum of two (2)
pipe diameters of the discharge pipe above the flood level rim of
the receiving vessel; in no case shall the distance be less than one
(1) inch (twenty-five (25) mm).
B. Backflow
prevention assemblies required by this Article shall be installed
at a location and in a manner approved by the City and shall be installed
at the expense of the water consumer.
C. Only
those models of double-check valve assemblies and reduced pressure
principle backflow prevention assemblies which are on the approved
list maintained by the Missouri Department of Natural Resources are
acceptable to meet the requirements of this Article.
D. A reduced
pressure principle assembly shall not be installed upstream of a fire
pump.
E. Reduced
pressure principle backflow prevention assemblies shall be installed
with no plug or additional piping affixed to the pressure differential
relief valve port (except for specifically designed funnel apparatus
available from the manufacturer) and with the pressure differential
relief valve port a minimum of twelve (12) inches above floor level.
Additionally, the assembly shall be installed at a location where
any leakage from the pressure differential relief valve port will
be noticed, that allows easy access to the assembly for maintenance
and testing, and that will not subject the assembly to flooding, excessive
heat or freezing.
F. Backflow
prevention assemblies installed on the service line to the consumer's
water system shall be located on the consumer's side of the water
meter immediately inside the wall where the line enters the building
and prior to any other connection or as approved by the City.
G. Backflow
prevention assemblies shall be located so as to be readily accessible
for maintenance and testing and shall be protected from excessive
heat and freezing. No reduced pressure principal backflow prevention
assembly shall be located where it will be submerged or subject to
flooding by any fluid.
H. No
by-pass piping shall be allowed around a backflow prevention assembly
unless the by-pass is equipped with the same level of protection.
[Ord. No. 1308 §3-12, 3-19-2001]
It shall be the duty of the consumer at any premises where backflow
prevention assemblies are installed to have certified inspections
and operational tests made at least once per year, as well as at the
time of construction or installation. In those instances where the
City deems the hazard to be great enough, certified inspections may
be required at more frequent intervals. These inspections and tests
shall be at the expense of the water consumer and shall be performed
by a tester certified by the Missouri Department of Natural Resources
to perform such tests. These assemblies shall be repaired, overhauled
or replaced at the expense of the consumer whenever said assemblies
are found to be defective. Records of such tests, repairs and overhaul
shall be mailed to the City and kept for a period of five (5) years.
The report must be on an approved form and must contain the name,
signature and certificate number of the certified backflow prevention
assembly tester attesting to the compliance of the assembly with established
operational requirements. Routine reports shall be submitted within
seven (7) days after making the inspection or test.
[Ord. No. 1308 §3-13, 3-19-2001]
A. The
City shall deny or discontinue, after reasonable notice to the occupants
thereof, the water service to any premises wherein any backflow prevention
assembly required by this Article is not installed, tested and maintained
in a manner acceptable to the City, or if it is found that the backflow
prevention assembly has been removed or by-passed, or if an unprotected
cross-connection exists on the premises.
B. Reasonable
notice shall be provided in writing by the City by personal contact
or service, certified mail, posting said notice on the consumer's
property, or by any other reasonable method available to the City.
The type of notice and the amount of time provided for the consumer
to bring his/her water system into compliance with the provisions
of this Article will be commensurate with the degree of hazard imposed
on the public water supply and shall be at the sole discretion of
the City.
C. Water
service to such premises shall not be restored until the consumer
has corrected or eliminated such conditions or defects in conformance
with this Article to the satisfaction of the City.
[Ord. No. 1308 §3-14, 3-19-2001]
The City Administrator or his/her designee shall be the City's
official representative responsible for carrying out and enforcing
the duties and obligations of the City as specified in this Article.
The Board of Aldermen may review final decisions rendered by the City's
representative pursuant to this Article upon request by the consumer.
[Ord. No. 1308 §3-15, 3-19-2001]
This Article is intended to be consistent with the provisions
of the Uniform Plumbing Code, as amended and adopted by the City.
In the event that any conflict is determined to exist between the
provisions of this Article and the Uniform Plumbing Code as amended
and adopted by the City, the more stringent provision providing the
most protection for backflow prevention shall apply.