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Plumbing codes require all water outlets to be equipped with a backflow prevention device to prevent contamination or pollution of the drinking water. Therefore, all sinks have a space between the end of the faucet and the flood level of the sink called an air gap.

To reduce the risk of contamination, a backflow preventer can be fitted. A backflow preventer is also important when potentially toxic chemicals are used, for instance for commercial/industrial descaling of boilers, or when chemical bleaches are used for residential power washing.

To ensure the device is functioning properly, a certified backflow tester must test all backflow prevention devices annually.

Backflow prevention devices are an important component of our drinking water protection program and are legally mandated under the New York State Sanitary Code and the Rules of the City of New York for those businesses identified as posing a risk to the public water supply.

For small to mid-size buildings (car washes, laundromats, small manufacturers) installation should cost between $5,000 and $7,000. For mid-size buildings (office complexes, large manufacturers or department stores) installation should cost between $7,500 and $13,000.

The Double Check Valve Assembly (DCVA) is used for a typical large business, condominium or high-rise building. The Double Check Detector Assembly (DCDA) is installed on a line that supplies water to the building's fire suppression system, which includes the fire sprinklers or standpipes.

Safety. Water backflow prevention is necessary to keep your drinking water safe and free of any contamination. Installing and maintaining a water backflow prevention device is the best way to ensure that your home remains protected.