§ 21-79. Definitions.

For the purpose of this division, the following definitions shall apply unless the context clearly indicates or requires a different meaning:

Approved. Accepted by the city as meeting an applicable specification stated or cited in this division, or as suited for the proposed use.

Auxiliary water supply. Any water supply on, or available to, the premises other than the city's approved public potable water supply. These waters may be polluted or contaminated or they may be objectionable and constitute an unacceptable water source over which the city does not have sanitary control.

Backflow. The flow of water or other liquid, mixture, or substance under pressure into the distributing pipes of a potable water supply system from any source or sources other than its intended source.

Backflow preventer. A device or means designed to prevent backflow or back-siphonage. Only the following are considered to be backflow prevention devices:

(1) Air gap separation. A physical separation between the free-flowing discharge end of a potable water supply pipeline and an open or non-pressure receiving vessel. An "approved air gap separation" shall be at least double the diameter of the supply pipe measured vertically above the top of the rim of the vessel. In no case shall it be less than one (1) inch.

(2) Reduced pressure backflow preventer. A device containing within its structure a minimum of two (2) independently acting approved check valves, together with an automatically operating pressure differential relief valve located between the two (2) check valves. The first check valve reduces the supply pressure a predetermined amount so that during normal flow and at cessation of normal flow the pressure between the checks shall be less than the supply pressure. In case of leakage of either check valve, the differential relief valve, by discharging to the atmosphere, shall operate to maintain the pressure between the checks less than the supply pressure. The unit shall include tightly closing shutoff valves located at each end of the device, and each device shall be fitted with properly located test cocks.

(3) Atmospheric vacuum breaker. A backflow prevention device which is operated by atmospheric pressure in combination with the force of gravity. The unit is designed to work on a vertical plane only. The one (1) moving part consists of a poppet valve which must be carefully sized to slide in a guided chamber and effectively shut off the reverse flow water when a negative pressure exists.

(4) Pressure vacuum breaker. A pressure vacuum breaker is similar to an atmospheric vacuum breaker except that the checking unit "poppet valve" is activated by a spring. This type of vacuum breaker does not require a negative pressure to react and can be used on a pressure side of a valve.

(5) 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 testing the water tightness of each check valve. A check valve is a valve that is drip-tight in the normal direction of flow when the inlet pressure is one (1) psi and the outlet pressure is zero. The check valve shall permit no leakage in a direction reverse to the normal flow. The closure element (e.g. clapper) shall be internally weighted or otherwise internally loaded to promote rapid and positive closure.

(6) Residential dual check. A compact unit manufactured with two (2) independent spring actuated check valves. The residential dual check is acceptable only as added backflow prevention in areas served by reuse systems defined in Chapter 62-610, Part III, FAC, when the cross connection control program identifies activities specific to subsections (5)(a) and (5)(b) of this section.

Back-siphonage. The flow of water or other liquid, mixture, or substance into the distributing pipes of a potable water supply system from any source other than its intended source caused by the sudden reduction of pressure in the potable water supply system.

Contamination. An impairment of the quality of potable water by sewage, industrial fluids, waste liquids, compounds, or other materials to a degree which creates a potential actual hazard to the public health through poisoning or through the spread of disease.

Cross connection. Any physical connection or arrangement of piping or fixtures between two (2) otherwise separate piping systems, one (1) of which contains potable water and the other non-potable water or industrial fluids of questionable safety, through which, or because of which, backflow or back-siphonage may occur into the potable water system. A water service connection between a public potable water distribution system and a customer's water distribution system which is cross-connected to a contaminated fixture, industrial fluid system, or with a potentially contaminated supply or auxiliary water system, constitutes one (1) type of cross connection. Other types of cross connection include connectors such as swing connections, removable sections, four-way plug valves, spools, dummy sections of pipe, swivel or changeover devices, sliding multiport tube, solid connections, and the like.

(1) Cross connection control by containment. The installation of an approved backflow prevention device at the water service connection to any customer's premises where it is not physically and economically feasible to find and permanently eliminate or control all actual or potential cross connections within the customer's water system; or the installation of an approved backflow prevention device on the service line leading to and supplying a portion of a customer's water system where there are actual or potential cross connections which cannot be effectively eliminated or controlled at the point of cross connection.

(2) Cross connection—controlled. A connection between a potable water system and a non-potable water system with an approved backflow prevention device properly installed that will continuously afford the protection commensurate with the degree of hazard.

Director. The director in charge of the city utilities department who is vested with the authority and responsibility for the implementation of an effective cross connection control program and for the enforcement of the provisions of this chapter.

Hazard, degree of. The term is derived from an evaluation of the potential risk to public health and the adverse effect of the hazard upon the potable water system, and shall include:

(1) Hazard—Health. Any condition, device, or practice in the water supply system and its operation that could create, or in the judgment of the director, may create a danger to the health and well-being of the water consumer. An example of a "health hazard" is a structural defect, including a cross connection, in the water supply system.

(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 device. Unprotected plumbing-type cross connections are considered to be a health hazard.

(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 pollutant or contaminant which would have a protracted effect on the quality of the potable water in the system.

Industrial fluids 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 an approved water supply. This may include, but shall not be limited to: polluted or contaminated waters; all types of process waters and "used waters" originating from the public potable water system which may have deteriorated in sanitary quality; chemicals in fluid form; plating acids and alkalis; circulated cooling waters connected to an open cooling tower and/or cooling towers that are chemically or biologically treated or stabilized with toxic substances; contaminated natural waters such as from wells, springs, streams, rivers, bays, harbors, irrigation canals or systems, and the like; and oils, gases, glycerin, paraffins, caustic and acid solutions, and other liquid and gaseous fluids used in industrial or other purposes or for firefighting purposes.

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 or quality 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.

Utilities department. The City of Lake Wales Utilities Department.

Water.

(1) Water—Non-potable. Water which is not safe for human consumption or which is of questionable potability.

(2) Water—Potable. Any water which, according to recognized standards, is safe for human consumption.

(3) Water—Service connections. The terminal end of a service connection from the public potable water system; that is, where the city loses jurisdiction and sanitary control over the water at its point of delivery to the customer's water system. If a meter is installed at the end of the service connection, the service connection shall mean the downstream end of the meter. There should be no unprotected takeoffs from the service line ahead of any meter or backflow prevention device located at the point of delivery to the customer's water system. "Service connection" shall also include water service connection from a fire hydrant and all other temporary or emergency water service connections from the public potable water system.

(4) Water—Used. Any water supplied from the public potable water system to a consumer's water system after it has passed through the point of delivery and is no longer under the sanitary control of the city.

Water system. The water system shall be considered as made up of two (2) parts: the customer system and the utility system.

(1) The "customer system" shall include those parts of the facilities beyond the termination of the utility distribution system which are utilized in conveying utility-delivered domestic water to points of use.

(2) The "utility system" shall consist of the source facilities and the distribution system; and shall include all those facilities of the water system under the complete control of the utility, up to the point where the customer's system begins (meter). The source shall include all components of the facilities utilized in the production, treatment, storage, and delivery of water to the distribution system. The distribution system shall include the network of conduits used for the delivery of water from the source to the customer's system.

(Ord. No. 2011-15, § 1, 9-7-11)