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498 Seventh Ave, 11th Floor
New York, NY 10018

(212) 539-7000

Catskill-Delaware Ultraviolet Disinfection Facility

An innovative, large-scale (two billion gallons/day) UV disinfection process, coupled with a strong source water protection program, provides increased public health protection while saving New York City more than $1.5 billion in construction costs and $25 million/year in operation costs.

Hazen and Sawyer, in joint venture, undertook pilot testing, planning, environmental assessment, design, permitting and construction services for the innovative Catskill-Delaware Ultraviolet Disinfection Facility.

Richard E. Peters, PE

Largest WTP in the World

This facility, an ACEC National Grand Award winner, has the landmark designation as the world’s largest for treating municipal drinking water.

Project Outcomes and Benefits

  • We took an in-depth look at UV disinfection, and determined that coupled with a strong source water protection program, this alternative to filtration provides increased public health protection while saving New York City over $1.5 billion in construction costs and $25 million/year in operation costs.
  • An innovative approach for evaluating large-scale UV disinfection equipment – a total of 56 units each capable of treating up to 60-mgd - was used to select the best equipment for this project and demonstrate UV could effectively treat over two billion gallons per day.
  • The facility poses fewer impacts to the environment than a filtration plant, due to a shorter construction period, considerably smaller footprint, and significantly lower power requirements.
  • Design was customized around selected equipment and planning for integration of the new facilities, as well as potential future filtration facilities, into the existing hydraulic grade of a completely gravity fed system, all without interruption of the water supply to NYC.