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


To ensure drinking water supplies are protected from contamination, Cross Connection Control Program staff inspect commercial facilities, industrial buildings, irrigation systems, and water distribution systems for proper installation and maintenance of backflow prevention assemblies. Additionally, staff monitor the installation, repair, and annual testing of over 16,000 backflow prevention assemblies installed on distribution systems operated by public water purveyors throughout the County.

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Backflow Device Test Apps links:

Backflow Tester Refresher Training 

When: Wednesday Octobre 10, 2018 9am-11:30am

Where: City of Oxnard Water Division, 251 South Hayes Ave. Oxnard

RSVP: Email or call Holly Sinclair to reseve your spot. (Training Flyer)

Information for Backflow Testers:

General Information and Public Resources:


Staff Specialist:

Holly Sinclair
805 654-2436


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805 654-2816