Croton Water Treatment Plant (290 mgd)
Client: New York City Department of Environmental Protection
Location: Bronx, NY
While the Croton system currently meets Federal and State standards, the NYCDEP determined that water treatment was required for the Croton supply to provide for the continued health and safety of the citizens of New York City and to comply with State and Federal water quality standards and regulations. New York City then initiated the design and construction of its first water treatment facility, the 290-mgd Croton Water Treatment Plant. Hazen and Sawyer, in joint venture, prepared conceptual designs, performed environmental impacts studies, prepared preliminary and final designs, and provided start-up operational services for this landmark plant, located in the Bronx’s Van Cortlandt Park.
Project Outcomes and Benefits
- The tight urban site necessitated a reduced building footprint, accomplished by stacking dissolved air flotation/filtration, sending residuals offsite for treatment, minimizing emergency generator capacity, constructing buttresses inside the plant structure, using single-sided formwork and excavated rock wall for outside form, among other innovative, space-saving measures.
- Under a separate site preparation contract, Hazen and Sawyer implemented an effective, award-winning approach for concurrent, phased design and construction to deliver timely sitework, thus meeting all mandate-driven deadlines.
- The project called for environmental conservation efforts, including constructing an infiltration trench to protect a nearby forested wetland from possible migration of water toward the excavation, and initiating a tree protection and monitoring program.
- The political nature of the project demanded a comprehensive public outreach program, to allay public concerns, and ensure minimal construction impacts to the surrounding community.
The Croton Water Treatment plant, which went into service in 2015, will produce up to 290 mgd of finished water. The plant includes a raw water and treated water pumping station and raw and treated water connections to the City’s distribution system through new tunnels constructed as part of this project. The treatment processes consisting of flotation for large solids removal, filtration for finer solids removal, ultraviolet and hypochlorite disinfection, as well as supplemental chemical conditioning is housed within the main treatment building. Water treated at the plant meets all current and anticipated water quality goals and standards.
NYCDEP authored a comprehensive Environmental Impact Statement comparing three sites for construction of the Croton WTP. Through detailed environmental, socio-economic and engineering analysis, as well as public involvement and the need to address issues related to security and water distribution, the Mosholu Golf Course site was selected for construction of the Croton WTP.
The completed plant is situated largely under a portion of the 13-acre driving range. In addition to the underground structure, the plant includes two small above ground buildings to access the facility and to receive deliveries.
For more information on this project, or to discuss a similar project in your area, contactWilliam Becker, P.E. at email@example.com