Chapter 13.10


13.10.010    Purpose.

13.10.020    Application.

13.10.030    Enforcement.

13.10.040    Definitions.

13.10.050    Cross-connections prohibited.

13.10.060    Installation of backflow prevention device.

13.10.070    Types of backflow prevention devices required.

13.10.080    Location.

13.10.090    Installation.

13.10.100    Approved backflow devices.

13.10.110    Inspections.

13.10.120    Right of entry for inspections.

13.10.130    Termination of service.

13.10.140    Rates.

13.10.010 Purpose.

The purpose of this chapter, in conjunction with Section 1003 of the Uniform Plumbing Code and the State of California Public Health Administrative Code, Title 17, is to protect the public health by the control and prevention of actual and potential cross-connections: (A) by requiring the proper installation and safeguarding of service lines leading to premises where cross-connections exist or are likely to occur; (B) by periodic inspections; and (C) by regulating plumbing within premises to minimize the danger of contamination to the water system on the premises or the public water system itself. (Ord. 168, 1988)

13.10.020 Application.

This regulation applies throughout the city to all premises and the owners and occupants thereof served by the city’s water system. It applies to all systems installed prior to or after its enactment. Every owner and every occupant of premises covered by this regulation is responsible for compliance with its terms and shall be strictly liable for all damages incurring as a result of failure to comply with the express terms and provisions contained herein. (Ord. 168, 1988)

13.10.030 Enforcement.

The director of water and sewer will administer the provisions of this chapter. Any deviation, modification or change from standards or approval of methods and material shall be governed by the director of water and sewer in accordance with state health regulations. (Ord. 168, 1988)

13.10.040 Definitions.

The following definitions will apply to the interpretation of this chapter:

A. “Air gap separation” means the unobstructed vertical distance through the free atmosphere between the lowest opening from any pipe or faucet supplying water to a tank, plumbing fixture, or other device and the flood level rim of the receptacle, and must be at least double the supply pipe measured vertically above the flood level rim of the vessel. In no case may the gap be less than one inch.

B. “Auxiliary supply” means any water source or system, other than the public potable water system, that may be available in the building or on the premises.

C. “Backflow” means the reversal of flow, other than in the intended direction into the distribution of the public water system, from a service connection.

1. “Back pressure” means the backflow caused by a pump, elevated tank, boiler, or other means that could create pressure within the system greater than the city water supply.

2. “Back siphonage” means a form of backflow due to a negative or subatmospheric pressure within the water system.

D. “Backflow prevention device” means an approved device to counteract back pressure or prevent back siphonage.

E. “Cross-connection” means any physical arrangement whereby a public water system is connected, directly or indirectly, with any other nonpotable water system, sewer, drain, conduit, pool, storage, reservoir, plumbing fixture, or other device which contains, or may contain, contaminated water, sewage, or other waste or liquid of unknown or unsafe quality which may be capable of imparting contamination into the public water system as a result of backflow. Bypass arrangements, jumper connections, movable sections, swivel or changeover devices, or other temporary or permanent devices through which, or because of which, backflow could occur, are considered to be cross-connections.

F. “Double check valve assembly (DCVA)” means an approved assembly composed of two single, independently acting check valves, including tightly closing shutoff valves located at each end of the assembly and suitable connections for testing the watertightness of each valve.

G. “Reduced pressure principle backflow prevention device (RPBD)” means an approved device incorporating two or more check valves and an automatically operating differential relief valve located between the two checks, two shutoff valves, and equipped with the necessary appurtenances for testing. The device must operate to maintain the pressure in the zone between the two check valves, less than the pressure on the public water system side of the device. At cessation of normal flow, the pressure between the check valves must be less than the supply pressure. In case of leakage of either check valve, the differential relief valve must operate to maintain the reduced pressure by discharging to the atmosphere. When the inlet pressure drops below two pounds per square inch, the relief valve must open to the atmosphere, thereby providing an atmospheric zone between the two check valves. (Ord. 168, 1988)

13.10.050 Cross-connections prohibited.

Except as provided below, all cross-connections, whether or not they are controlled by automatic devices such as check valves or by hand-operated mechanisms such as gate valves or stop cocks, are prohibited.

Failure on the part of persons, firms, or corporations to discontinue the use of all cross-connections and to physically separate cross-connections is sufficient cause for the immediate discontinuance of public water services to the premises. (Ord. 168, 1988)

13.10.060 Installation of backflow prevention device.

Backflow prevention devices shall be installed at the service connection or within any premises where, in the judgment of the director of water and sewer, the nature and extent of activity on the premises, materials stored in connection with the activities, or materials stored on the premises would present an immediate or potential hazard to the public’s health should a cross-connection occur, even though such cross-connection does not exist at the time the backflow prevention device is required to be installed. This includes:

A. Premises having an auxiliary water supply;

B. Premises having internal cross-connections that are not correctable, or intricate plumbing arrangements which make it impracticable to ascertain whether or not cross-connections exist;

C. 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;

D. Premises having a history of cross-connections being established or re-established;

E. Premises on which any substance is handled under pressure so as to permit entry into the public water system, or where a cross-connection could reasonably be expected to occur. This includes the handling of process waters and cooling waters;

F. Premises with commercial or residential water softener units (backwash);

G. Premises where materials of a toxic or hazardous nature are handled such that if backflow should occur, a serious health hazard may result; and

H. The following types of facilities will fall into one of the above categories where a backflow prevention device shall be installed at these facilities as set forth in the California Administrative Code, Title 17, Public Health, unless the director of water and sewer determines that no hazard exists:

1. Hospitals, mortuaries, clinics;

2. Laboratories;

3. Sewage treatment plants;

4. Food and beverage processing plants;

5. Chemical plants using a water process;

6. Metal plating industries;

7. Petroleum processing or storage plants;

8. Radioactive material processing plants or nuclear reactors;

9. Car washes;

10. Any building or structure three stories or higher; and

11. Others specified by the certified cross-connection specialist. (Ord. 168, 1988)

13.10.070 Types of backflow prevention devices required.

The type of prevention device required by the city depends on the degree of hazard which exists as follows:

A. An air-gap separation or reduced pressure backflow prevention device shall be installed where the water supply may be contaminated by sewage, industrial waste of a toxic nature, or other contaminant which would cause a health hazard.

B. In the case of a substance which may be objectionable but not hazardous to health, a double check valve assembly, air-gap separation or reduced pressure principle backflow prevention device shall be installed.

C. Pressure type vacuum breaker units (spring loaded) are the approved city supplied irrigation systems. The unit must be installed at least 12 inches above the highest fixture point of water usage and in such a manner that drainage will preclude back pressure. (Ord. 168, 1988)

13.10.080 Location.

Backflow prevention devices required by this chapter must be installed at the meter, at the property line of the premises when meters are not used, or at a location designated by the director of water and sewer. The device must be located so as to be readily accessible for maintenance and testing, and where part of the device will not be submerged or hidden from proper inspection. (Ord. 168, 1988)

13.10.090 Installation.

Backflow prevention devices required by this chapter must be installed under the supervision of the director of water and sewer. (Ord. 168, 1988)

13.10.100 Approved backflow devices.

Any protective device required by this chapter must be a model approved by a hydraulics testing laboratory recognized by the Department of Health Services such as the University of Southern California, as specified in their latest approved list of such laboratories. (Ord. 168, 1988)

13.10.110 Inspections.

Backflow prevention devices must be inspected and tested annually or more often when inspections indicate any occasion of failure. An annual inspection fee will be charged. The device must be repaired, overhauled and replaced whenever it is found to be defective. Inspections and tests must be made by a certified cross-connection specialist or by the city’s water department personnel and the device tagged. Repairs and inspections will be at the expense of the owner or occupant. (Ord. 168, 1988)

13.10.120 Right of entry for inspections.

An authorized employee of the city shall have reasonable access to any premises supplied with water for the purpose of making inspections for cross-connection control, inspections of the water system and water meters upon such premises. (Ord. 168, 1988)

13.10.130 Termination of service.

The failure of the owner or occupant to cooperate in the installation, maintenance, testing or inspection of backflow prevention devices required by this chapter may have water service discontinued after service of 24 hours’ notice of the intention of the city to do so. (Ord. 168, 1988)

13.10.140 Rates.

Rates will be established or amended, whenever necessary, by resolution of the city council. (Ord. 168, 1988)