backflow prevention device is used to protect potable water supplies from contamination or pollution due to backflow.

In water supply systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower, or other fixture. Water pressure may fail or be reduced when a water main bursts, pipes freeze, or there is unexpectedly high demand on the water system (for example, when several fire hydrants are opened). Reduced pressure in the pipe may allow contaminated water from the soil, from storage, or from other sources to be drawn up into the system.

Backflow prevention devices are an important component of the New York City Department of Environmental Protection’s 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.

Premises with multiple water service lines;

Premises with roof tanks and elevated storage lines


Slaughterhouse / Live Poultry Processing Facilities

Ice Manufacturing Facilities

Printing Facilities


Premises with large boilers or chemically treated boilers

Warehouses (with toxic chemical storage)

Premises with Commercial or Public Kitchens

Premises with water cooled equipment or chillers

Premises with Groundwater Wells

Premises that Reuse or Recycle Water

Shipyards and Marinas

Schools and Colleges

Food Preparation Facilities

Nursing Homes

Barber Shops & Beauty Salons

Properties with in-ground irrigation sprinklers

Metal plating, cleaning, processing or fabricating facilities

Photo-processing facilities

Laundries and dry cleaners

Commercial car washes


Hospitals, Clinics and Laboratories (including veterinary hospitals)

Medical and Dental Offices

Funeral Parlors

Food processing plants and meat / fish packers

Dye Plants

Paper processors

Auto Repair Shops




Large residential dwellings with water boilers that use rust-inhibitors or other water treatment chemicals, (“treated water boilers”)

Sewage treatment plants or handling facilities

To determine whether or not your property requires a backflow prevention device, you must retain the services of a Licensed Professional Engineer (PE), Licensed Registered Architect (RA), Licensed Master Plumber (LMP) or request a property inspection from DEP. Feel free to fill out the contact form or give us a call 646-741-9470

Every water line to the property must have a backflow prevention device. If your property is required to have a backflow prevention device and has multiple water service lines, you must install a device on each line.

First, you will receive a 30 day installation notice from the New York DEP . If you do not show proof that a device is being installed, after the 30 days you will receive a notice of violation and are susceptible to fines of up to $2500.