Backflow

What is a Backflow Device?

A Backflow Device is a fixture designed to stop contaminated water from flowing backward into a clean water supply. They ensure water only flows in one direction to protect drinking water from pollution and contamination.

Why are they necessary?

A sudden drop in pressure from a fire hydrant or a water main break can create a vacuum and suck contaminated water backwards into the clean water supply.

For residential properties, the Franklin Square Water District requires a Double Check Valve (DCV) on any home that has an underground sprinkler system. A DCV relies on its two check valves for protection.

Commercial properties must have a Reduced Pressure Zone (RPZ) installed. The primary difference between a RPZ and a DCV is the level of protection they provide. An RPZ is a high-hazard device that includes a relief valve to discharge contaminated water, whereas a DCV is a low-to-medium hazard device that relies on two internal valves to stop backflow without a discharge mechanism.

New York State Department of Health requires that all backflow devices be tested on an annual basis by a certified backflow tester.

Backflow results can be emailed to info@fswd.org