The following list are owners of properties that pose an actual or potential risk of contamination to the City’s water supply. This includes property with any of, but not limited to, the following facilities:

  • ™Medical, dental offices and laboratories ™
  • Swimming Pools
  • Funeral homes
  •  Wells
  • Sewage treatment or handling Booster Pumps
  • Dry-Cleaning establishments ™
  • Water Storage Tanks
  • Chemicals used in processing, e.g., photo finishing, dye plants, etc.
  • Metal Manufacturing, Cleaning, Processing or Fabricating Plants
  • ™ Multiple water services ™
  • Poultry Processing
  • ™ Commercial or public kitchens ™
  • Water Cooled Equipment or Chillers
  • ™ Beauty Salons or Barber Shops ™
  • Heat Exchangers with Water (single wall)
  • ™ Commercial Washing Machines
  • ™ In-ground Irrigation sprinkler
  • ™ Chemically Treated Boilers
  • ™ Car Wash, Auto Repair, Auto Body Shops
  • ™ Large Boilers (more than 350000 BTU) ™ Warehouses (with Toxic Chemicals Storage)



Owners must install special backflow devices, known as backflow preventers on the main water pipes that supply their buildings. The device prevents water from flowing back in to the City’s water supply. Owners must have plans submitted to DEP before installing the device, and have the device tested by a NYC certified backflow-prevention tester at least once a year. DEP’s Bureau of Water and Sewer Operations, a Bureau of the Department of Environmental Protection (DEP).