Cross Connection Control

A cross connection is a connection between a drinking water supply and a source of pollution or contamination. The entry of pollutants and contaminants into the drinking water supply is called "backflow."

Backflow preventer device

To ensure drinking water supplies are protected from contamination, Cross Connection Control Program staff inspect industrial buildings, irrigation systems, and water distribution systems for proper installation and maintenance of backflow prevention devices. Additionally, staff monitor the installation, repair, and annual testing of over 15,000 backflow prevention devices installed on distribution systems operated by public water purveyors throughout the County.

Backflow Device Test Apps links:

Staff Specialist:

Holly Sinclair

805 654-2431


Ron Ventura

805 654-2436


Charles Genkel

805 658-9248

Links and Publications: