2. Scoping Notice for Greater New Haven Water Pollution Control Authority Combined Sewer Overflow Long-Term Control Plan

Project Title: Combined Sewer Overflow Long-Term Control Plan

Municipality where proposed project might be located: New Haven

Project Locations: Throughout City of New Haven

Project Description: New Haven is a combined sewer overflow community, where both sanitary sewage and stormwater are carried in a single pipe.  During rainfall events of sufficient intensity and duration, the capacity of the collection system is overwhelmed and excess flows discharge to nearby rivers and New Haven Harbor via built-in overflows in the collection system.  The overflows were designed to prevent the combined sewer flows from backing up into basements and surcharging onto streets. The Greater New Haven Water Pollution Control Authority (GNHWPCA) is responsible for operation and maintenance of this collection and treatment system. 

GNHWPCA has agreed, through a DEEP consent order, to eliminate these discharges, and has developed the CSO Long Term Control Plan to accomplish this. 

The Plan recommends a combination of sewer separation, in-system storage, and capacity increases in the conveyance system and at New Haven’s East Shore Water Pollution Abatement Facility (ESWPAF).  These improvements will be implemented in a phased approach in over a 20 year period.  The plan will be reevaluated as the project progresses, based on environmental improvements, changes in regulations and new technological solutions that may emerge.  The implementation of the proposed Plan will be conducted in three phases: Short-Term, Intermediate-Term, and Long-Term. The Short- Term improvements include collection system modifications, including green infrastructure improvements in the West River area and other areas in the city.  Major pumping station improvements and other collection system improvements will be undertaken as part of the Intermediate-Term phase.  This will enable additional flow to be conveyed to the ESWPAF.  Phase 3, the Long-Term portion of the Plan, will include upgrades to the ESWPAF, Fair Haven sewer separation, and construction of CSO storage tanks to complete improvement to eliminate all CSO discharge during a 2-year, 6-hour storm event in the system. 

Project Maps: 

Short-Term Control Plan Components

Intermediate-Term Control Plan Components

Long-Term Control Plan Components                          

Written comments from the public are welcomed and will be accepted until the close of business on:  March 22, 2018.

Any person can ask the sponsoring agency to hold a Public Scoping Meeting by sending such a request to the address below.  If a meeting is requested by 25 or more individuals, or by an association that represents 25 or more members, the sponsoring agency shall schedule a Public Scoping Meeting.  Such requests must be made by March 2, 2018.

Written comments and/or requests for a Public Scoping Meeting should be sent to:

If you have questions about the public meeting, or other questions about the scoping for this project, contact:

Notes: The Connecticut DEEP is an Affirmative Action/ Equal Opportunity Employer that is committed to complying with the requirements of the Americans with Disabilities Act.  Please contact us at (860) 418-5910 or deep.accomocations@ct.gov if you: have a disability and need a communication aid or service; have limited proficiency in English and may need information in another language; or if you wish to file an ADA or Title VI discrimination complaint. Any person needing a hearing accommodation may call the State of Connecticut relay number-711. Requests for accommodations must be made at least two weeks prior to any hearing, program, or event.