A Backflow Prevention Device is required when there is a possible danger of contamination to the water distribution system, such as an auxiliary water supply on a property. Auxiliary water supplies include wells, springs or water in pipes under pressure (other than the public water system).
State water quality control regulations require strict enforcement of California’s public health regulations regarding backflow prevention.
Property owners who are required to have such a device on their water service can comply with the cross connection regulations (backflow prevention) by installing a District-approved device, such as a double check valve assembly or a Reduced Pressure Principal device (RP). A list of approved devices is issued by the University of California and authorized by the State Department of Health Services.
The District inspects these devices annually and will notify you if there is a violation that requires your action.