11-2-3: CROSS-CONNECTION PROTECTION REQUIREMENTS:

   A.   General Provisions:

      1.   Unprotected cross-connections with the public water supply are prohibited.

      2.   Whenever backflow protection has been found necessary, the City will require the water user to install an approved backflow prevention device by and at water user's expense for continued services or before a new service will be granted.

      3.   Wherever backflow protection has been found necessary on a water supply line entering a water user's premises, then any and all water supply lines from the City's mains entering such premises, buildings, or structures shall be protected by an approved backflow prevention device. The type of device to be installed will be in accordance with the requirements of this Chapter.

   B.   Where Protection Required:

      1.   Each service connection from the City water system for supplying water to premises having an auxiliary water supply shall be protected against backflow of water from the premises into the public water system unless the auxiliary water supply is accepted as an additional source by the City, and is approved by the public health agency having jurisdiction.

      2.   Each service connection from the City water system for supplying water to any premises on which any substance is handled in such fashion as may allow its entry into the water system shall be protected against backflow of the water from the premises into the public system. This shall include the handling of process waters and waters originating from the City water system which have been subjected to deterioration in sanitary quality.

      3.   Backflow prevention devices shall be installed on the service connection to any premises having: a) internal cross-connections that cannot be permanently corrected and controlled to the satisfaction of the State or local Health Department and the City; or b) intricate plumbing and piping arrangements or where entry to all portions of the premises is not readily accessible for inspection purposes, making it impracticable or impossible to ascertain whether or not cross-connections exist.

   C.   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), double check-detector check valve assembly (DCDC), 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 City. 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 in subsection D of this Section. 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 City or health agency.

      2.   Two (2) or more services supplying water from different street mains to the same building, structure, or premises through which an interstreet main flow may occur, shall have at least a double check valve assembly on each water service to be located adjacent to and on the property side of the respective meters. Such double check valve shall not be considered adequate if backflow protection is deemed necessary to protect the City's mains from pollution or contamination. In such cases the installation of approved backflow devices at such service connections shall be required.

   D.   Table 1:

   TYPE OF BACKFLOW PROTECTION REQUIRED

                              Minimum Type Of
                              Backflow Prevention

Degree Of Hazard

1.   Sewage And Hazardous Substances:

   a.   Premises where the public water system
is used to supplement the reclaimed water supply.               AG

   b.   Premises where there are wastewater 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. An RP may be provided in lieu of an AG if
approved by the health agency and the City.                  AG

   c.   Premises where reclaimed water is used and there
is no interconnection with the potable water system. An RP may be
provided in lieu of an AG if approved by the health agency and the City.      AG

   d.   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.
An RP may be provided in lieu of an AG if approved by the health agency
and the City.                                 AG

   e.   Premises where there are irrigation systems into which fertilizers,
herbicides, or pesticides are, or can be, injected.               RP

2.   Auxiliary Water Supplies:

   a.   Premises where there is an unapproved auxiliary water
supply which is interconnected with the public water system. An RP
or DC may be provided in lieu of an AG if approved by the health agency
and the City.                                 AG

   b.   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 an RP if approved by the health agency and the City.      RP

3.   Fire Protection Systems:

   a.   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 interconnected).                  DC

   b.   Premises where the fire system is supplied from the public
water system    and interconnected with an unapproved auxiliary water
supply. An RP may be provided in lieu of an AG if approved by the
health agency and the City.                         AG

   c.   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.          DC

4.   Dockside Watering Points And Marine Facilities:            DC

   a.   Pier hydrants for supplying water to vessel for any purpose.      RP

   b.   Premises where there are marine facilities.            RP

5.   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-connections do not exist.      RP

6.   Premises where there is a repeated history of cross-connections
being    established or re-established.                     RP

7.   Each service connection, domestic or fire service, that serves
a building of 50 feet or more in height above the service line.            DCDC

(Ord. 1110, 5-3-1988)