Application for Approval of Backflow Prevention Devices

If you own a property, you need a backflow prevention device on every water service pipe that connects the drinking water supply and a possible source of contamination. This device stops dirty water from mixing with clean water. A licensed plumber or engineer can help you decide whether you need this device.

Backflow prevention devices stop dirty water from flowing back into clean water, which can happen because of backflow or back-siphonage from commercial property or a residential unit into a water main. You must install this device on any water pipe that might connect clean drinking water to dirty water according to the rules in Title 15, Chapter 20 of the Rules of the City of New York.

To install a backflow prevention device, a licensed professional engineer or registered architect must submit an application to the New York City Department of Environmental Protection (DEP). They need to include drawings for a Reduced Pressure Zone (RPZ) device or a Double Check Valve Assembly.

If you do not install a backflow prevention device, the DEP can turn off your water. You may also get notices of violation, cease and desist orders, fines, penalties, and other legal actions as described in Section 24-346 of the New York City Administrative Code.

Find water and sewer forms on the NYC Department of Environmental Protection (DEP) website.

• A certified backflow tester must test the backflow prevention device every year.
• Send the test results to the NYC Department of Environmental Protection at:
  Cross Connection Control
  59-17 Junction Blvd., 3rd Floor LR
  Flushing, NY 11373

• Download and print the application form.
  • Application for Approval of Backflow Prevention Assemblies (PDF)
• Submit two copies of the form to this address:
  
  NYC Department of Environmental Protection (DEP)
  Cross Connection Control
  59-17 Junction Blvd., 3rd Floor LR
  Flushing, NY 11373

• If the form is found satisfactory, you will receive an approved copy of the application.

• After approval, you must get a permit to install the device from the New York City Department of Buildings.

• After installation, the device must be tested by a certified backflow tester. Contact the New York State Department of Health for a list of testers:

  • Call: 518-402-7650
  • Email: h2ocert@health.ny.gov
  • Visit: New York State Department of Health website