For the purposes of CMC § 13.04.470 through § 13.04.540, the following words and phrases shall be construed as defined in this section.
A. 
"Approved protective device"
for purposes of this Article X shall mean a protective device of a design and manufacture approved by this City which has been tested and has proved to operate in the manner intended to protect the municipal water supply.
B. 
A "cross-connection"
shall mean any unprotected actual or potential connection or structural arrangement between a public or a consumer's potable water system and any other source or system through which it is possible to introduce into any part of the potable system any used water, industrial fluid, gas, or substance other than the intended potable water with which the system is supplied. By-pass arrangements, jumper connections, removable sections, swivel or change-over devices and other temporary or permanent devices through which or because of which "backflow" can or may occur are considered to be cross-connections.
C. 
"Auxiliary supply"
shall mean any water supply on or available to the premises other than the public water supply.
D. 
"Approved double check valve assembly"
shall mean an assembly of at least two independently acting check valves including tightly closing shutoff valves on each side of the check valve assembly and suitable leak-detector drains plus connections available for testing the water tightness of each check valve, the manufacturer and operation of which have been approved by the City.
E. 
"Airgap separation"
shall mean a physical break between a supply pipe and receiving vessel. The airgap 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.
F. 
"Approved reduced pressure principle backflow prevention device"
shall mean a device incorporating two or more check valves and an automatically operating differential release valve located between the two checks, two shutoff valves and equipped with necessary appurtenances for testing, the manufacture and operation of which have been approved by the City. The device shall operate to maintain the pressure in the zone between the two check valves, less than the pressure on the public water supply side of the device. To be approved these devices must be readily accessible for maintenance and testing and installed in a location where no part of the valve will be submerged.
(Ord. 358 § 1, 1980)
A. 
Each service connection from the municipal water system supplying water to premises having an auxiliary water supply shall be protected from backflow of water from the premises into the municipal water system, unless the auxiliary water supply is accepted as an additional source by the City and its authorized backflow prevention officer.
B. 
Each service connection from municipal water system to premises on which any substance is handled under pressure in such fashion as to permit entry into the water system shall be protected against backflow of the water from the premises into the municipal water system. This includes the handling of processed waters and waters originating from the public water supply system which have been subject to deterioration in sanitary quality.
C. 
Backflow prevention devices shall be installed on the service connection to any premises that have internal cross-connections unless such cross-connections are abated to the satisfaction of the City and its authorized backflow prevention officer.
(Ord. 358 § 1, 1980)
The protective device required shall depend upon the degree of hazard as set forth below:
A. 
At the service connection to any premises where there is an auxiliary water supply handed in a separate piping system with no known cross-connection, the public water supply shall be protected by an approved double check valve assembly.
B. 
At the service connection to any premises on which a substance that would be objectionable, but not necessarily hazardous to health, if introduced into the public water supply, is handled as to constitute a cross-connection, the public water supply shall be protected by an approved double check valve assembly.
C. 
At the service connection on any premises on which there is an auxiliary water supply where cross-connections are known to exist which cannot be presently eliminated, the public water supply system shall be protected by an approved reduced pressure principle backflow protective device. A double check valve assembly may be used in lieu of such device if approved by the City and the authorized backflow prevention officer.
D. 
At the service connection to any premises on which any material dangerous to health or toxic substance in toxic concentration is or may be handled under pressure, the public water supply shall be protected by an airgap separation. The airgap shall be located as close as practicable to the service cock and all piping between the service cock and receiving tank shall be entirely visible. If these conditions cannot be reasonably met, the public water supply shall be protected with either an approved reduced pressure principle backflow prevention device, or an approved double check valve assembly, providing the alternative is approved by the City and the authorized backflow prevention officer.
E. 
At the service connection to any sewage treatment plant or sewage pumping station the public water supply shall be protected by an airgap's separation. The airgap shall be located as close as practicable to the service cock and all piping between the service cock and receiving tank shall be entirely visible. If these conditions cannot be reasonably met, the public water supply shall be protected with an approved reduced pressure principle backflow prevention device, providing this alternative is approved by the State Department of Public Health.
(Ord. 358 § 1, 1980)
A. 
Where protective devices are required under the provisions of this article the device shall be installed by and at the expense of the water user on the premises.
B. 
If more than one user is serviced by a single connection to the municipal water supply, a device shall be installed by and at the expense of the owner of the premises.
(Ord. 358 § 1, 1980)
Existing users who require installation of a protective device on the effective date of this article shall be allowed a reasonable time within which to comply with the provisions of this article.
A. 
Premises requiring protective devices under the terms of this article shall be tested to verify compliance at least once a year. Premises having a history of repeated failures may be inspected with such frequency as is necessary to ensure compliance with this article.
B. 
In the event the test indicates failure of the protective device, the user or property owner shall be given notice of such failure which notice shall state a time deemed to be reasonable by the inspecting official within which to comply with this article.
A list of protective devices of the types referred to in this chapter which have been approved by the City shall be maintained at City Hall and shall be open to public inspection.
(Ord. 358 § 1, 1980)
Any notices prescribed or allowed by this chapter shall be deemed to have been given when personally delivered or when placed in the United States mail, postage fully prepaid, addressed to the owner of the premises and, if different, also to the water user as shown from the records of the City.
(Ord. 358 § 1, 1980)