These regulations are intended to protect the District’s potable water supply and are not intended for protection of users from the hazards of cross-connections within their own premises.
The District shall provide backflow prevention devices on the potable water service to the premises. Such devices shall be owned and maintained by the District and located on the premises of the property served and shall not be on the District’s portion of the system.
(a) 
On-site recycled water systems are a separate and controlled non-potable system. Under normal conditions, protective devices will be required on the District’s potable water service. Under no circumstances will the District tolerate an actual or potential cross-connection between the District’s potable water supply and the customer’s on-site non-potable water facilities.
(b) 
The District will require cross-connection control on the District’s potable water supply in all cases and shall review each service on a case-by-case basis. The District will require a backflow prevention device on its potable water supply at its discretion, and specifically:
(1) 
When recycled water is used on individually owned and controlled premises;
(2) 
When the recycled water system has additional pressure and
(3) 
When determined this is a risk of cross-connection.
The District shall inspect backflow prevention devices at least once a year, or more often in those instances where successive inspections indicate repeated failure. All inspections and testing shall be performed by a tester certified by the local health department. These devices shall be repaired, overhauled, or replaced at the expense of the water user whenever they are found to be defective. Records of all such tests, repairs and overhauls shall be maintained by a list and made available to the local health department. Northing contained herein shall relieve a potable water customer from the duty to install and maintain backflow prevention devices under Title 3 of this Code.
Where the premises contain dual or multiple water systems and piping, the exposed portions for recycled water pipelines shall be painted, banded or marked at sufficient intervals. All outlets from secondary or other potentially contaminated systems shall be posted as being contaminated and unsafe for drinking purposes.
The District, which in turn will notify the local and State Water Resources Control Board, shall be kept informed of the identity of the person responsible for the water piping on all premises concerned with these regulations. At each premise where it is necessary in the opinion of the regulatory agency and/or the District, a Water Supervisor shall be designated. This Water Supervisor shall be responsible for the installation and the use of pipelines and equipment and for the prevention of cross-connections.
In the event of contamination or pollution of the drinking water system due to a cross-connection on the premises, the local health officer and the District shall be promptly advised by the person responsible for the water system so that appropriate measures may be taken to overcome the contamination or pollution.