RPZ Backflow Preventers
The "RPZ" device, as it is commonly referred to, is a backflow prevention device which is used to prevent "backflow" of foreign liquids and other matter into the potable supply of water which could result in contamination. Backflow can occur when the pressure on our system is less then the pressure on a customer's system.

A backflow prevention device is used to protect water supplies from contamination or pollution. Many types of backflow prevention devices also have test ports so that they can be tested or examined to ensure that they are functioning properly. Many states and/or local municipalities actually require annual testing of such devices. A check valve is a common form of a backflow preventer.

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.

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