[R.O. 2009 §13.20.010; Ord. No. 4417 §1, 1983; Ord. No. 5202 §2, 5-4-1998]
As used in this Chapter, the following terms shall have these
prescribed meanings:
AIR-GAP SEPARATION
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 the receptacle and shall be at least double the diameter of the
supply line pipe measured vertically above the flood level rim of
the vessel. In no case shall the gap be less than one (1) inch.
AUXILIARY SUPPLY
Any water source of system, other than the public water supply,
that may be available in the building or premises or which is not
a water supply approved by the Missouri Division of Health.
BACKFLOW
The undesirable reversal of flow of water or mixtures of
water and other liquids, gases or other substances into the public
water supply from any source(s).
BACK PRESSURE
Backflow caused by a pump, elevated tank, boiler or other
means that could create pressure within the system greater than the
public water supply pressure.
BACK SIPHONAGE
A form of backflow due to a negative or sub-atmospheric pressure
within a water system.
CERTIFIED BACKFLOW PREVENTION ASSEMBLY TESTER
A person who has proven his/her competency to test, repair,
overhaul and make reports on backflow prevention assemblies to the
satisfaction of the Missouri Department of Natural Resources.
CROSS-CONNECTION
Any physical arrangement whereby a public water supply is
connected directly or indirectly with any other water supply system,
sewer, drain, conduit, pool, storage reservoir, plumbing fixture or
other device which contains or may contain contaminated water, sewage
or other waste or liquid of unknown or unsafe quality which may be
capable of imparting contamination to the public water supply as a
result of backflow. By-pass arrangements, jumper connections, removable
section, swivel or changeover devices and other temporary or permanent
devices through which, or because of which, a backflow can, or may
occur are considered to be cross-connections.
DOUBLE CHECK VALVE ASSEMBLY
An assembly composed of two (2) single, independently acting
check valves, including tightly closing shutoff valves located at
each end of the assembly and suitable connections for the in-line
testing of the water-tightness of each check valve.
PUBLIC WATER SUPPLY
Any system of water supply intended or used for human consumption
or other domestic uses, including source, treatment, storage, transmission
and distribution facilities where water is furnished to any community,
collection or number of individuals or is made available to the public
for human consumption or domestic use, but excluding water supplied
serving one (1) single-family residence.
REDUCED PRESSURE PRINCIPAL BACKFLOW PREVENTION DEVICE
A device containing two (2) independently acting, internally
loaded, approved check valves together with a hydraulically operating,
mechanically independent pressure relief valve located between the
check valves. The device shall include tightly closing shutoff valves
at each end of the assembly and shall be equipped with necessary appurtenances
for in-line testing. The pressure differential relief valve shall
operate to maintain the pressure in the zone between the two (2) check
valves at least two (2) pounds per square inch less than the public
water supply pressure. At cessation of normal flow, the pressure between
the check valves shall be less than the supply pressure. In case of
leakage of either check valve, the differential pressure relief valve
shall operate to maintain this reduced pressure by discharging to
the atmosphere. When the inlet pressure is two (2) pounds per square
inch or less, the relief valve shall open to the atmosphere thereby
providing an air-gap in the device.
[R.O. 2009 §13.20.020; Ord. No. 4417 §2, 1983; Ord. No. 5202 §2, 5-4-1998]
The purpose of this Chapter is to establish a cross-connection
control program to protect the health of water consumers by the control
of actual and/or potential cross-connections through the proper installation
and surveillance of backflow prevention devices on service lines leading
to premises where cross-connections exist or are likely to occur and
through the inspection and regulation of the plumbing within the premises
to minimize danger of contamination of the water system on the premises
or the public water supply itself. The cross-connection control program
will comply with the provisions of the Missouri Code of State Regulations,
Title 10 CSR 60-11, Backflow Prevention.
[R.O. 2009 §13.20.030; Ord. No. 4417 §3, 1983; Ord. No. 5202 §2, 5-4-1998]
All cross-connections, whether or not such cross-connections
are controlled by automatic devices such as check valves or by hand-operated
mechanisms such as gate valves or stop cocks, are hereby prohibited.
[R.O. 2009 §13.20.040; Ord. No. 4417 §4, 1983; Ord. No. 5202 §2, 5-4-1998]
Failure on the part of persons, firms or corporations to discontinue
the use of any and all cross-connections and to physically separate
such cross-connections will be sufficient cause for the discontinuance
of the public water service to the premises on which the cross-connection
exists.
[R.O. 2009 §13.20.050; Ord. No. 4417 §5, 1983; Ord. No. 5202 §2, 5-4-1998]
The utility shall make periodic inspections of premises served
by the public water supply to check for the presence of cross-connections.
Should such a cross-connection be found, the utility, giving the customer
not less than fifteen (15) days' notice of its intention, will discontinue
service. If an immediate hazard to health is caused by the cross-connection,
water service to the premises shall be disconnected and discontinued
until it is verified that the cross-connection has been removed.
[R.O. 2009 §13.20.060; Ord. No. 4417 §§6—11, 1983; Ord. No. 5202 §2, 5-4-1998; Ord. No. 6342, 4-12-2024]
A. Backflow prevention devices shall be installed at the service connection
within any premises where in the judgment of the utility 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 hazard to health should a cross-connection
occur, even though such cross-connection does not exist at the time
the backflow prevention device is required to be installed. This shall
include, but not be limited to, the following situations:
1.
Premises having an auxiliary water supply, unless the quality
of the auxiliary water supply is in compliance with local standards
and is acceptable to the utility;
2.
Premises having internal cross-connections that are not correctable
or intricate plumbing arrangements which make it impractical to ascertain
whether or not cross-connections exist;
3.
Premises where entry is restricted so that inspections for cross-connections
cannot be made with sufficient frequency or at sufficiently short
notice to assure that cross-connections do not exist;
4.
Premises having a repeated history of cross-connections being
established or reestablished;
5.
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;
6.
Premises where materials of a toxic or hazardous nature are
handled such that if back siphonage should occur, a serious health
hazard may result;
7.
The following types of facilities will fall into one (1) of
the above categories where a backflow prevention device is required
to protect the public water supply. A backflow prevention device shall
be installed at these facilities unless the utility determines no
hazard exists:
a.
Hospitals, mortuaries, clinics, medical buildings autopsy facilities,
morgues, veterinary facilities, dental clinics, and other medical
facilities;
b.
Chemical, biological and radiological laboratories, including,
but not limited to, those in high schools, colleges, universities
and research institutions;
c.
Sewage, storm water and industrial waste treatment plants and
pumping stations;
d.
Food or beverage processing plants, including, but not limited
to, dairies, soft drink bottlers, and breweries;
e.
Plants manufacturing, refining, compounding or processing fertilizer,
film, herbicides, natural or synthetic rubber, pesticides, petroleum
or petroleum products, pharmaceuticals, radiological materials. Commercial
facilities that use herbicides, pesticides, fertilizers or any chemical
which would be a contaminant to the public water system;
f.
Metal or plastic manufacturing, fabrication, cleaning, plating
or processing facilities;
g.
Irrigation systems with facilities for injection of pesticides
herbicides or other chemicals or with provisions for creating back
pressure. The backflow assembly may be installed between the customer
service line and the irrigation system;
h.
Irrigation systems without facilities for injection of pesticides,
herbicides or other chemicals. The backflow assembly may be installed
between the customer service line and the irrigation system;
i.
Commercial laundries and dye works;
j.
Plants manufacturing, paper and paper products;
k.
Auxiliary water systems, including, but not limited to, alternative
water sources;
l.
Facilities which have pumped or repressurized cooling or heating
systems that are served by a public water systems;
m.
Aircraft and missile manufacturing plants;
n.
Fire sprinkler systems not using chemical additives. This only
applies to new fire sprinkler systems or fire sprinkler systems scheduled
for modifications;
o.
Fire sprinkler systems using any chemical additives;
p.
Automotive plants, including, but not limited to, those plants
which manufacture motorcycles, automobiles, trucks, recreational vehicles
and construction and agricultural equipment;
q.
Canneries, packing houses and reduction plants;
r.
Tanks to store water from the public water system for fire fighting
only, unless the tanks meet the requirements of the Department for
construction to maintain bacteriological quality of the water;
s.
Plants processing, blending or refining animal, vegetable or
mineral oils;
u.
Waterfront facilities including piers, docks, marinas and shipyards;
v.
Industrial facilities which recycle water;
w.
Restricted or classified facilities or other facilities closed
to the supplier of water or the Department;
x.
Portable tanks for transporting water taken from a public water
system;
y.
Cross-connections that could permit introduction of contaminants
into the public or customer water system and create a nuisance, be
aesthetically objectionable or cause minor damage to the public water
system or its appurtenances;
z.
Facilities which contain any boiler system and are served by
a public water system. The backflow assembly may be installed on the
water service line to the boiler.
B. The type of protective device required shall be determined by the
utility and shall depend on the degree of hazard which exists. Backflow
hazards may be classified as Class I (contamination) or Class II (objectionable
substances). Protection devices required for each class are further
defined as follows:
1.
Class I Backflow Hazards (Contamination). An air-gap separation
or a reduced pressure principle backflow prevention device shall be
installed where the water supply may be contaminated with sewage,
industrial waste of a toxic nature or other contaminant which would
cause an immediate or potential health or system hazard.
2.
Class II Backflow Hazards (Objectionable Substances). In a case
of a substance which may be objectionable but not hazardous to health,
a double check valve assembly, air-gap separation or a reduced pressure
principle backflow prevention device shall be installed.
C. Backflow prevention assemblies shall be installed on the customer
water system as close as possible to the point of service connection
and prior to any other connection or branch line. If it is not possible
to install the backflow prevention assembly as described, then installation
shall be at the approval of the utility provider.
1.
A backflow preventer typically extends above ground, although
it is common to see many installed inside the building or in underground
vaults. For superior safety and ability to service and maintain, the
preferred method of installation is outside of the building and above
ground.
2.
For backflow preventers in underground vaults there should be
enough space for safety and the ability to service and maintain backflow
preventer.
3.
Vaults should be debris and dirt free around the backflow preventer
and maintained by the customer.
D. Reduced pressure principal backflow prevention devices 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 port a minimum of twelve (12) inches above floor or ground
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.
E. Double check valve backflow prevention devices shall be installed
at a location that allows easy access to the assembly for maintenance
and testing and that will not subject the assembly to excessive heat
or freezing.
F. No by-pass piping shall be allowed around a backflow prevention assembly
unless the by-pass is equipped with an identical backflow prevention
assembly.
G. Backflow prevention devices shall be installed at the customer's
expense.
[R.O. 2009 §13.20.070; Ord. No. 4417 §12, 1983; Ord. No. 5202 §2, 5-4-1998]
Any protective device required in this Chapter shall be a model
approved by the utility and the department.
[R.O. 2009 §13.20.080; Ord. No. 4417 §13, 1983; Ord. No. 5202 §2, 5-4-1998; Ord. No. 6343, 4-12-2024]
Backflow prevention devices shall be inspected and tested annually
or more often where successive inspections indicate repeated failure.
The devices shall be inspected and tested at the customer's expense
and repaired or replaced and retested at the customer's expense whenever
they are found to be defective. The devices shall also be overhauled
by the customer at intervals recommended by the device manufacturer.
All such inspections, tests, repairs and overhauls shall be conducted
by a certified backflow prevention assembly tester. The backflow testing
company or person shall procure a plumber’s license issued by
the City of Sikeston, with a current plumber’s performance bond.
The original copy of certified test results shall be forwarded to
the utility within thirty (30) days after making the inspection or
test or repairs or overhaul and retesting.
[R.O. 2009 §13.20.090; Ord. No. 4417 §14, 1983]
Failure of the customer to cooperate in the installation, maintenance,
testing or inspection of backflow prevention devices required in this
Chapter shall be grounds for the termination of water services to
the premises.