[R.O. 1988 § 6-49(a); Ord. No. 2596 § 3, 4-4-1988; Ord. No. 2730 § 1, 4-2-1990]
(a) 
Purpose. The purpose of this Division is:
(1) 
To protect the public potable water supply from contamination or pollution by containing within the consumer's internal distribution system or private water system contaminants or pollutants which could backflow through the service connection into the public potable water supply system.
(2) 
To 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) 
To 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.
(b) 
Application. This Division shall apply to all premises served by the public potable water system of the City of Rolla.
(c) 
Policy.
(1) 
This Division will be reasonably interpreted by the water supplier. It is the water supplier's intent to recognize the varying degrees of hazard and to apply the principle that the degree of protection shall be commensurate with the degree of hazard.
(2) 
The water supplier shall be primarily responsible for protection of the public potable water distribution system from contamination or pollution due to backflow or contaminants or pollutants through the water service connection. The cooperation of all consumers is required to implement and maintain the program to control cross-connections. The water supplier and consumer are jointly responsible for preventing contamination of the water system.
(3) 
If, in the judgment of the water supplier or their authorized representative, 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 their own expense; and failure, refusal, or inability on the part of the consumer to provide such protection shall constitute grounds for discontinuing water service to the premises until such protection has been provided.
(4) 
If, in the opinion of the water supplier or their authorized representative, a real and serious threat to public health is posed, the water supplier may discontinue service without notice.
[R.O. 1988 § 6-49(b); Ord. No. 2596 § 3, 4-4-1988; Ord. No. 2730 § 1, 4-2-1990]
The following definitions shall apply in the interpretation and enforcement of this Division:
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 overflow level rim of the receptacle, and shall be at least double the diameter of the supply pipe measured vertically.
APPROVED
A backflow prevention device or method has been accepted by the water supplier as defined by Missouri Department of Natural Resources as suitable for the proposed use.
AUXILIARY WATER SUPPLY
Any water source or system, other than the public water supply, that may be available in the building or premises.
BACKFLOW
The flow other than the intended direction of flow, or any foreign liquids, gases, or substances into the distribution system of a public water supply.
BACKFLOW PREVENTION DEVICE
Any device, method or type of construction intended to prevent backflow into a potable water system.
CONSUMER
Protection of the public water supply by installing a cross-connection control device or air gap separation on the main service line to a facility.
CONSUMER'S WATER SYSTEM
Any water system, supplied by or connected to a public water system, from the point where it taps into the main supply line to the user's facilities. A household plumbing system is considered a consumer's water system.
CONTAINMENT
Protection of the public water supply by installing a cross-connection control device or air gap separation on the main service line to a facility.
CONTAMINATION
An impairment of the quality of the water by sewage, process fluids, or other wastes to a degree which could create an actual hazard to the public health through poisoning or through spread of disease by exposure.
CROSS CONNECTION
A physical connection or arrangement between two (2) otherwise separate piping systems; one of which contains potable water, the other a non-potable fluid, or water or unknown quality, where there could be flow from one system to the other, the direction depending on the pressure differential between the two (2). Cross connections may be considered as direct or indirect. A direct connection is where the potable water system is physically joined to a system containing unsafe water, sewage, or other waste that could contaminate the safe water system. An indirect cross-connection is a condition where a source of contaminated water may be blown across, sucked, or diverted into the potable 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 which 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 device.
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.
INTERCHANGEABLE CONNECTION
An arrangement or device that will allow alternate but not simultaneous use of two (2) sources of water.
ISOLATION
Protection of a facility service line by installing a cross-connection control device or air gap separation on an individual fixture, appurtenance, or system.
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.
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.
REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTION DEVICE
A device that contains a minimum of two (2) independently acting check valves with an automatically operated pressure differential relief valve between the two (2) check valves. During normal flow and at the cessation of normal flow, the pressure between these two (2) checks is less than the supply pressure. In case of leakage of either check valve, the differential relief valve, by discharging to the atmosphere, maintains the pressure between the check valves at less than the supply pressure. The unit includes tightly closing shutoff valves at each end of the device, and each device is fitted with test cocks.
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.
WATER SUPPLIER
Rolla Municipal Utilities.
[R.O. 1988 § 6-49(c); Ord. No. 2596 § 3, 4-4-1988; Ord. No. 2730 § 1, 4-2-1990]
(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 water supplier and as required by the laws and regulations of the Missouri Department of Natural Resources.
(b) 
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 water supplier and the Missouri Department of Natural Resources.
(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 considered by the water supplier as necessary for the protection of health and safety.
[R.O. 1988 § 6-49(d); Ord. No. 2596 § 3, 4-4-1988; Ord. No. 2730 § 1, 4-2-1990]
(a) 
The consumer's premises shall be open at all reasonable times to the water supplier, or their authorized representative, for the conduction of 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 systems.
(b) 
On request by the water supplier or their authorized representative, the consumer shall furnish information on water use practices within their premises.
(c) 
It shall be the responsibility of the water consumer to conduct periodic surveys of water use practices on their premises to determine whether there are actual or potential cross-connections to their water system through which contaminants or pollutants could backflow into their or the public potable water system.
[R.O. 1988 § 6-49(e); Ord. No. 2596 § 3, 4-4-1988; Ord. No. 2730 § 1, 4-2-1990]
The type of protection required by this Division shall depend on the degree of hazard which exists, as follows:
(a) 
An approved air gap separation shall be installed where the public potable water system may be contaminated with substances that could cause severe health hazard.
(b) 
An approved air gap separation or an approved reduced pressure principle backflow prevention device shall be installed where the public potable water system may be contaminated with a substance that could cause a system or health hazard.
(c) 
An approved air gap separation or an approved reduced pressure principle backflow prevention device 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.
[R.O. 1988 § 6-49(f); Ord. No. 2596 § 3, 4-4-1988; Ord. No. 2730 § 1, 4-2-1990]
(a) 
An approved backflow prevention device shall be installed on each service line to a consumer's water system serving premises where, in the judgment of the water purveyor or the Missouri Department of Natural Resources, 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.
(b) 
An approved air gap separation or reduced pressure principle backflow prevention device shall be installed at the service connection or within any premises where, in the judgment of the water supplier or the Missouri Department of Natural Resources, 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 water supplier and the Missouri Department of Natural Resources.
(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 inspection for cross-connections cannot be made with sufficient frequency or at sufficiently short notice to ensure the cross-connections do not exist.
(4) 
Premises having a repeated history of cross-connections being established or reestablished.
(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 back pressure should occur, a serious health hazard may result.
(c) 
The following types of facilities fall into one (1) or more of the categories of premises where an approved air gap separation or reduced pressure principle backflow prevention device is required by the water supplier and the Missouri Department of Natural Resources 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 water supplier and the Missouri Department of Natural Resources.
(1) 
Aircraft and missile plants.
(2) 
Automotive plants.
(3) 
Auxiliary water systems.
(4) 
Beverage bottling plants.
(5) 
Canneries, packing houses, and reduction plants.
(6) 
Car washing facilities.
(7) 
Chemical manufacturing, processing, compounding or treatment plants.
(8) 
Cold storage plants, dairies.
(9) 
Film laboratories.
(10) 
Fire protection systems.
(11) 
Hazardous waste storage and disposal sites.
(12) 
Hospitals, mortuaries, clinics.
(13) 
Irrigation and sprinkler systems.
(14) 
Industries using toxic substances.
(15) 
Laundries and dye works.
(16) 
Metal manufacturing, cleaning, processing and fabricating plants.
(17) 
Nursing or convalescent homes and clinics.
(18) 
Oil and gas production, storage or transmission properties.
(19) 
Paper and paper products plants.
(20) 
Plating plants.
(21) 
Power plants.
(22) 
Printing and publishing facilities.
(23) 
Radioactive material processing plants or nuclear reactors.
(24) 
Research and analytical laboratories.
(25) 
Rubber plants, natural and synthetic.
(26) 
Stockyards.
(27) 
Sewage and storm drainage facilities — pumping stations.
(28) 
Water front facilities and industries.
(29) 
Water loading stations.
[R.O. 1988 § 6-49(g); Ord. No. 2596 § 3, 4-4-1988; Ord. No. 2730 § 1, 4-2-1990]
(a) 
Any backflow prevention device required by this Division shall be of a model or construction approved by the water supplier and the Missouri Department of Natural Resources.
(1) 
Air gap separation to be approved shall be at least twice the diameter of the supply pipe, measured vertically above the top rim of the vessel, but in no case less than one (1) inch.
(2) 
A double check valve assembly or a reduced pressure principle backflow prevention device shall be approved by the water supplier and shall appear on the current "list of approved backflow prevention devices" established by the Missouri Department of Natural Resources.
(b) 
Existing backflow prevention devices approved by the water supplier at the time of installation and properly maintained shall, except for inspection and maintenance requirements, be excluded from the requirements of this Division so long as the water supplier is assured that they will satisfactorily protect the water system. Whenever the existing device is moved from its present location, or requires more than minimum maintenance, or when the water supplier finds that the maintenance constitutes a hazard to health, the unit shall be replaced by a backflow prevention device meeting the requirements of this Division.
[R.O. 1988 § 6-49(h); Ord. No. 2596 § 3, 4-4-1988; Ord. No. 2730 § 1, 4-2-1990]
(a) 
Backflow prevention devices required by this Division shall be installed at a location and in a manner approved by the water supplier and shall be installed at the expense of the water consumer.
(b) 
Backflow prevention devices installed on the service line to the consumer's water system shall be located on the consumer's side of the water meter, as close to the meter as is reasonably practical, and prior to any other connection.
(c) 
Backflow prevention devices shall be located so as to be readily accessible for maintenance and testing, protected from freezing and where no part of the device will be submerged or subject to flooding by any fluid.
[R.O. 1988 § 6-49(i); Ord. No. 2596 § 3, 4-4-1988; Ord. No. 2730 § 1, 4-2-1990]
(a) 
It shall be the duty of the consumer at any premises on which backflow prevention devices required by this Division are installed to have inspection, tests, and overhauls made in accordance with the following schedule or more often where inspections indicate a need.
(1) 
Air gap separations shall be inspected at the time of installation and at least every twelve (12) months thereafter.
(2) 
Double check valve assemblies shall be inspected and tested for tightness at the time of installation and at least every twelve (12) months thereafter. They shall be dismantled, inspected internally, cleaned, and repaired whenever needed and at least every thirty (30) months.
(3) 
Reduced pressure principle backflow prevention devices shall be inspected and tested for tightness at the time of installation and at least every twelve (12) months thereafter. They shall be dismantled, inspected internally, cleaned, and repaired whenever needed and at least every five (5) years.
(b) 
Inspections, tests, and overhauls of backflow prevention devices shall be made at the expense of the water consumer and shall be performed by a State of Missouri, certified backflow prevention device tester.
(c) 
Whenever backflow prevention devices required by this Division are found to be defective, they shall be repaired or replaced at the expense of the consumer without delay.
(d) 
The water consumer must maintain a complete record of each backflow prevention device from purchase to retirement. This shall include a comprehensive listing that includes a record of all tests, inspections, and repairs. Records of inspections, tests, repairs, and overhauls shall be made available to the water supplier upon request.
(e) 
Backflow prevention devices shall not be bypassed, made inoperative, removed, or otherwise made ineffective without specific authorization by the water supplier.
[R.O. 1988 § 6-49(j); Ord. No. 2596 § 3, 4-4-1988; Ord. No. 2730 § 1, 4-2-1990]
(a) 
The water supplier shall deny or discontinue, after reasonable notice to the occupants thereof, the water service to any premises wherein any backflow prevention device required by this Division is not installed, tested, and maintained in a manner acceptable to the water supplier or if it is found that the backflow prevention device has been removed or bypassed, or if an unprotected cross-connection exists on the premises.
(b) 
Water service to such premises shall not be restored until the consumer has corrected or eliminated such conditions or defects in conformance with this Division to the satisfaction of the water supplier.