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 > Home > Government > Department Directory > Special Districts > Water Systems > Backflow Prevention > Selection of a Backflow Prevention Device

Selection of a Backflow Prevention Device

The selection of a backflow prevention device is based upon several factors. However, backflow prevention devices are required if there exists an actual or potential hazard for cross-connection. Must be AWWA approved.

backflow valve

Some of these hazards include:


• Irrigation systems

• Fire sprinkler systems

• Medical facilities

• Processing plants

• Well, lake, and reclaimed water sources


Two commonly required backflow prevention devices are the Double Check Valve Assembly (DC) and the Reduced Pressure Zone Assembly (RP). Both of these protect your public utility drinking water system from backflow created by back siphonage and backpressure.

Commercial Backflow Valve

The RP backflow prevention device is used for potential health hazards such as sewage, medical fluids, and chemicals.


The double check or DC is used to protect the utility system from non-health hazards such as odor, color, and taste. These include well water, swimming pool water, or nontoxic industrial fluids such as dye or food products.


The District recommends the assistance of a licensed plumber certified by AWWA for backflow, if you have any questions.

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Lake County Special Districts Administration
230 N. Main Street
Lakeport, CA 95453
(707) 263-0119, (707) 263-3836 fax