2.07.040 Type of protection required.
1. The type of protection that shall be provided to prevent Backflow into the Approved Water Supply shall be commensurate with the degree of hazard that exists on the consumer’s premises. The type of protective device that may be required (listing in an increasing level of protection) includes: Double Check Valve Assembly (DC), Reduced Pressure Principle Backflow Prevention Device (RP), and an Air gap separation (AG). The Water User may choose a higher level of protection than required by the District. The minimum types of Backflow protection required to protect the Approved Water Supply, at the User’s Water Connection to premises with varying degrees of hazard are given in Table 1 below.
Situations which are not covered in Table 1 shall be evaluated on a case by case basis and the appropriate Backflow protection shall be determined by the District or Health Agency.
Table 1.
A. Sewage and Hazardous Substances.
(1)Premises where the Public Water System is used to supplement the Reclaimed Water supply. (AG)
(2)Premises where there are Waste water pumping and/or treatment plants and there is no interconnection with the potable water system. This does not include a single family residence that has a Sewage lift pump. A RP may be provided in lieu of an AG if approved by the Health Agency and the District. (AG)
(3)Premises where Reclaimed Water is used and there is no interconnection with the potable water system. A RP may be provided in lieu of an AG if approved by the Health Agency and the District. (AG)
(4)Premises where Hazardous Substances are handled in any manner in which the substances may enter a potable water system. This does not include a single family residence that has a Sewage lift pump. A RP may be provided in lieu of an AG if approved by the Health Agency and the District.
(5)Premises where there are irrigation systems into which fertilizers, herbicides, or pesticides are, or can be, injected. (RP)
B. Auxiliary Water Supplies. Table 1-b
(1)Premises where there is an unapproved auxiliary water supply which is interconnected with the Public Water System. A RP or DC may be provided in lieu of an AG if approved by the Health Agency and the District. (AG)
(2)Premises where there is an unapproved auxiliary water supply and there are no interconnections with the Public Water System. A DC may be provided in lieu of a RP if approved by the Health Agency and district. (RP)
C. Fire Protection Systems.
(1)Premises where the fire system is directly supplied from the Public Water System and there is an unapproved auxiliary water supply on or to the premises (not interconnection). (DC)
(2)Premises where the fire system is supplied from the Public Water System and interconnected with an unapproved auxiliary water supply. A RP may be provided in lieu of an AG if approved by the Health Agency and District. (AG)
(3)Premises where the fire system is supplied from the Public Water System and where either elevated storage tanks or fire pumps which take suction from the private reservoirs or tanks are used.
(4)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 connection do not exist. (RP)
(5)Premises where there is a repeated history of cross connecting being established or re established. (RP)
(6)Two or more Services supplying water from different street mains to the same Building, structure, or premises through which an inter street main flow may occur, shall have at least a standard check valve on each water Service to be located adjacent to and on the property side of the respective meters. Such check valve shall not be considered adequate if Backflow protection is deemed necessary to protect the District’s mains from pollution or Contamination; in such cases the installation of Approved Backflow Prevention Devices at such Service Connections shall be required. [Ord. 2014-1 § 7, 2014.]