Understand that it is necessary to install a backflow preventer in any situation where incoming water and wastewater have a chance of being cross-connected. This serves to protect you and your home, keeping your drinking, bathing, and cleaning water safe.

Backflow prevention systems are devices installed onto a pipe that only allow water to flow in one direction. Think of it as a one-way gate that allows water from the city's public water supply to flow into your home's piping but stops water if and when it ever tries to flow backward into the main water supply.

If you are wanting to have your backflow device tested or repaired, please see the attached list of certified testers.

Disclaimer: This list contains the names of backflow prevention assembly testers doing business in San Diego County who have been certified by the American Water Works Association (AWWA) and/or American Backflow Prevention Association (ABPA). The San Diego County Department of Environmental Health and Rainbow Municipal Water District has verified these certifications but makes no other representation concerning the qualifications of these testers. The listing is not intended as either an advertisement for these testers or as a warranty by the County or District, expressed or implied. This list is for your convenience only. It should be used with discretion.