[R.O. 2014 §705.010; Ord. No. 567 §1-A, 12-14-1989]
The purpose of this Chapter is:
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.
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.
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.
[R.O. 2014 §705.020; Ord. No. 567 §1-B, 12-14-1989]
This Chapter shall apply to all premises served by the public potable water system of the City of Marshfield.
[R.O. 2014 §705.030; Ord. No. 567 §1-C, 12-14-1989]
This Chapter will be reasonably interpreted by the Water Purveyor. It is the Water Purveyor'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.
The Water Purveyor 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 Purveyor and consumer are jointly responsible for preventing contamination of the water system.
If, in the judgment of the Water Purveyor or his/her authorized representative, cross-connection protection is required through either piping modification or installation of an approved backflow prevention device, due notice of at least ten (10) days shall be given to the consumer. The consumer shall immediately comply by providing the required protection at his/her own expense; and failure, refusal, or inability on the part of the consumer to provide such protection within said ten (10) day period shall constitute grounds for discontinuing water service to the premises until such protection has been provided.
If in the opinion of the Water Purveyor a serious hazard to the health of the citizens of the community is posed by a cross-connection, the City will discontinue the service immediately without the ten (10) day notice. All attempts will be made by the City to notify a customer as soon as possible so immediate corrective action can be taken.
[R.O. 2014 §705.040; Ord. No. 567 §2 and Appendix A, 12-14-1989]
The following definitions shall apply in the interpretation and enforcement of this Chapter:
- 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 above the flood level rim of the vessel, but in no case less than one (1) inch.
- AUXILIARY WATER SUPPLY
- Any water source or system, other than the public water supply, that may be available in the building or premises.
- 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
- Any double-check valve or reduced pressure principle backflow preventer having resilient-seated shut-off valves on both the upstream and downstream end and the necessary test cocks as integral parts of the assembly.
- The owner or person in control of any premises supplied by or in any manner connected to a public water system.
- Protection of the public water supply by installing a backflow prevention assembly or air-gap separation on the main service line to a facility.
- 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.
- 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.
- 1. 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.
- 2. 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.
- 3. 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.
- 4. 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.
- 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.
- 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.
- 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 PURVEYOR
- The owner, operator, or individual in responsible charge of a public water system.
[R.O. 2014 §705.050; Ord. No. 567 §III, 12-14-1989]
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 Purveyor, and as required by the laws and regulations of the Missouri Department of Natural Resources.
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 Water Purveyor and the Missouri Department of Natural Resources.
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 Purveyor as necessary for the protection of health and safety.
[R.O. 2014 §705.060; Ord. No. 567 §IV, 12-14-1989]
The consumer's premises shall be open at all reasonable times to the Water Purveyor, or his/her 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 system.
On request by the Water Purveyor or his/her authorized representative, the consumer shall furnish information on water use practices within his/her premises.
It shall be the responsibility of the water 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.
[R.O. 2014 §705.070; Ord. No. 567 §V, 12-14-1989]
The type of protection required by this Chapter shall depend on the degree of hazard which exists, as follows:
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.
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.
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.
[R.O. 2014 §705.080; Ord. No. 567 §VI, 12-14-1989]
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 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.
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 Water Purveyor 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:
Premises having an auxiliary water supply, unless the quality of the auxiliary supply is acceptable to the Water Purveyor and the Missouri Department of Natural Resources.
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.
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.
Premises having a repeated history of cross-connections being established or reestablished.
Premises, which due to the nature of the enterprise therein, are subject to recurring modifications or expansion.
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.
Premises where materials of a toxic or hazardous nature are handled such that if back siphonage or back pressure should occur, a serious health hazard may result.
The types of facilities listed in Appendix A 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 Water Purveyor 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 Purveyor and the Missouri Department of Natural Resources.
[R.O. 2014 §705.090; Ord. No. 567 §VII, 12-14-1989]
Any backflow prevention assembly required to protect the facilities listed in Appendix A shall be of a model or construction approved by the Water Purveyor and the Missouri Department of Natural Resources.
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.
A double-check valve assembly or a reduced pressure principle backflow prevention assembly shall be approved by the Water Purveyor, and shall appear on the current "list of approved backflow prevention assemblies" established by the Missouri Department of Natural Resources.
Existing backflow prevention assemblies approved by the Water Purveyor at the time of installation and properly maintained shall, except for inspection and maintenance requirements, be excluded from the requirements of this Chapter so long as the Water Purveyor is assured that they 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 Water Purveyor finds that the maintenance constitutes a hazard to health, the unit shall be replaced by a backflow prevention assembly meeting the requirements of this Chapter.
[R.O. 2014 §705.100; Ord. No. 567 §VIII, 12-14-1989]
Backflow prevention assemblies required by this Chapter shall be installed at a location and in a manner approved by the Water Purveyor and shall be installed at the expense of the water consumer.
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, as close to the meter as is reasonably practical, and prior to any other connection.
Backflow prevention assemblies shall be located so as to be readily accessible for maintenance and testing, protected from freezing. No reduced pressure principle backflow prevention assembly shall be located where it will be submerged or subject to flooding by any fluid.
[R.O. 2014 §705.110; Ord. No. 567 §IX, 12-14-1989]
It shall be the duty of the consumer at any premises on which backflow prevention assemblies required by this Chapter are installed to have inspection, tests, and overhauls made in accordance with the following schedule or more often where inspections indicate a need.
Air-gap separations shall be inspected at the time of installation and at least every twelve (12) months thereafter.
Double-check valve assemblies shall be inspected and tested for tightness at the time of installation and at least every twelve (12) months thereafter.
Reduced pressure principle backflow prevention assemblies shall be inspected and tested for tightness at the time of installation and at least every twelve (12) months thereafter.
Inspections, tests, and overhauls of backflow prevention assemblies shall be made at the expense of the water consumer and shall be performed by a State of Missouri certified backflow prevention assembly tester.
Whenever backflow prevention assemblies required by this Chapter are found to be defective, they shall be repaired or replaced at the expense of the consumer without delay.
The water consumer must maintain a complete record of each backflow prevention assembly 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 Purveyor upon request.
Backflow prevention assemblies shall not be by-passed, made inoperative, removed or otherwise made ineffective.
[R.O. 2014 §705.120; Ord. No. 567 §X, 12-14-1989]
The Water Purveyor shall deny or discontinue, after due notice to the occupants thereof, the water service to any premises wherein any backflow prevention assembly required by this Chapter is not installed, tested, and maintained in a manner acceptable to the Water Purveyor, or treated, and maintained in a manner acceptable to the Water Purveyor, 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.
Water service to such premises shall not be restored until the consumer has corrected or eliminated such conditions or defects in conformance with this Chapter to the satisfaction of the Water Purveyor.