A backflow prevention device is used to protect water supplies from contamination or pollution. Many types of backflow prevention devices also have test cocks so that they can be tested or examined to ensure that they are functioning properly.

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In the United States, the Environmental Protection Agency (EPA) holds local water suppliers responsible for maintaining a certain amount of purity in potable water systems. Many states and/or local municipalities require annual testing of backflow prevention assemblies. A check valve is a common form of backflow prevention.

Backflow prevention protects the potable water system from minor, moderate, and severe hazards. There are over 10,000 reported cases of backflow contamination each year. Some cases can be fatal. Backflow devices are required by law where needed and must be installed in accordance with plumbing or building codes. A backflow assembly has test cocks and shut-off valves and must be tested each year, if relocated or repaired, and when installed.

The simplest, and most effective way to provide backflow prevention is to provide an air gap. An air gap is simply a space between any device that opens to a plumbing system (like a valve or faucet) and any place where water can collect or pool.

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This Symbol: ** -- Indicates AWWA Certified Backflow Prevention Testers approved by Napa City for 2011.

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Backflow Testing, AWWA Certified Backflow Prevention Testers Plumbing Contractors - Backflow prevention Devices Napa Valley, Napa, County, San Francisco North Bay, Ca. USA

A backflow prevention device is used to protect water supplies from contamination or pollution. Many types of backflow prevention devices also have test cocks so that they can be tested or examined to ensure that they are functioning properly.

Looking for Backflow Prevention Testers or devices? Please scroll down.

Backflow Testing, AWWA Certified Backflow Prevention Testers
Plumbing Contractors - Backflow prevention Devices
Napa Valley, Napa, County, San Francisco North Bay, Ca. USA