Chapter 20.02


20.02.010    Air-gap separation.

20.02.020    Approved backflow prevention device.

20.02.030    Approved water supply.

20.02.040    Auxiliary supply.

20.02.050    AWWA standard.

20.02.060    Backflow.

20.02.070    Contamination.

20.02.080    Cross-connection.

20.02.090    Double check valve assembly.

20.02.100    Health agency.

20.02.110    Local health agency.

20.02.120    Person.

20.02.130    Premises.

20.02.140    Reduced pressure principle assembly.

20.02.010 Air-gap separation.

The term “air-gap separation” means a physical break between a supply pipe and a receiving vessel. The air gap shall be at least double the diameter of the supply pipe measured vertically above the top rim of the vessel, in no case less than one inch. (Ord. 88-11 § 1 (part))

20.02.020 Approved backflow prevention device.

The term “approved backflow prevention device” means devices which have passed laboratory and field evaluation tests performed by a recognized testing organization which has demonstrated its competency to perform such tests to the California Department of Health Services. (Ord. 88-11 § 1 (part))

20.02.030 Approved water supply.

The term “approved water supply” means any water supply whose potability is regulated by a state or local health agency. (Ord. 88-11 § 1 (part))

20.02.040 Auxiliary supply.

The term “auxiliary supply” means any water supply on or available to the premises other than the approved water supply. (Ord. 88-11 § 1 (part))

20.02.050 AWWA standard.

The term “AWWA standard” means an official standard developed and approved by the American Water Works Association (AWWA). (Ord. 88-11 § 1 (part))

20.02.060 Backflow.

The term “backflow” means a flow condition, caused by a differential in pressure, that causes the flow of water or other liquids, gases, mixtures or substances into the distributing pipes of a potable supply of water from any source or sources other than an approved water supply source. Back-siphonage is one cause of backflow. Back pressure is the other cause. (Ord. 88-11 § 1 (part))

20.02.070 Contamination.

The term “contamination” means a degradation of the quality of the potable water by any foreign substance which creates a hazard to the public health or which may impair the usefulness or quality of the water. (Ord. 88-11 § 1 (part))

20.02.080 Cross-connection.

The term “cross-connection,” as used in this title, means any unprotected actual or potential connection between a potable water system used to supply water for drinking purposes and any source or system containing unapproved water or a substance that is not or cannot be approved as safe, wholesome and potable. Bypass arrangements, jumper connections, removable sections, swivel or changeover devices, or other devices through which backflow could occur, shall be considered to be cross-connections. (Ord. 88-11 § 1 (part))

20.02.090 Double check valve assembly.

The term “double check valve assembly” means an assembly of at least two independently acting check valves including tightly closing shutoff valves on each side of the check valve assembly and test cocks available for testing the watertightness of each check valve. (Ord. 88-11 § 1 (part))

20.02.100 Health agency.

The term “health agency” means the California Department of Health Services, or the local health agency with respect to a small water system. (Ord. 88-11 § 1 (part))

20.02.110 Local health agency.

The term “local health agency” means the county or city health authority. (Ord. 88-11 § 1 (part))

20.02.120 Person.

The term “person” means an individual, corporation, company, association, partnership, municipality, public utility, or other public body or institution. (Ord. 88-11 § 1 (part))

20.02.130 Premises.

The term “premises” means any and all areas on a customer’s property which are served or have the potential to be served by the public water system. (Ord. 88-11 § 1 (part))

20.02.140 Reduced pressure principle assembly.

The term “reduced pressure principle assembly” means a backflow prevention device incorporating two independently acting check valves, a hydraulically operating, mechanically independent pressure relief valve, a shut-off valve at each end of the device and necessary appurtenances for testing as required by the department. (Ord. 93-05 § 1)