CSO Regulator Improvement Projects

A number of CSO regulator projects are planned for 2017-2018. These regulator projects involve the design and construction of improvements to reduce the frequency, duration and volume of any wet weather overflows pursuant to our Long-Term Control Plan. Click the Project Links for more information on these projects.

CWF 2016-03 WEST RIVER CSO IMPROVEMENT PROJECT – Orange Avenue, Ella Grasso Boulevard, Whalley Avenue – New Haven, CT

What do CSO Regulators Do?

Several large capacity combined sewers (meaning sewage and stormwater runoff are collected and conveyed in the same pipes) located in the City of New Haven that convey flow to the ESWPAF for treatment are equipped with CSO regulators. These CSO regulators direct flow to the ESWPAF, but excess wet weather flow must periodically be diverted to nearby rivers and the Long Island Sound.

Humphrey & Mitchell Pump Station Rehabilitation

Humphrey & Mitchell Pump Station Rehabilitation

As part of our asset management program and to continue to provide reliable and cost-effective wastewater transmission services, the work at the Humphrey and Mitchell Pump Stations will include a total renovation of these aging pump stations located in New Haven.

For more information on the benefits, impacts, timing and coordination please click on the Construction Notification link.

GNHWPCA Large Diameter Pipe Cleaning Program

GNHWPCA Large Diameter Pipe Cleaning Program

GNHWPCA’s large diameter sewer pipes range from 30 inches in diameter to 84 inches in diameter. Most of these large diameter sewer pipes are main interceptor sewers located in the City of New Haven that transport combined flow to the ESWPAF for treatment. Periodic cleaning of these interceptor sewers is required to remove sand, grit, rocks, and other heavy debris that can accumulate in the pipe over time.Work crews clean the pipe using high pressure water hoses, cleaning heads and vacuums to extract the debris. Video cameras are also used to inspect the pipe prior to and post cleaning of the sewer pipes. As such, residents may see activities related to the large diameter pipe inspections for several weeks leading up to the actual cleaning of the pipes.

Notices will be provided to residences and establishments in advance of any large diameter sewer cleaning work on their street.

Click this Large Diameter Sewer Cleaning Projects link to view locations where large diameter pipe cleaning projects are being implemented and when.

GNHWPCA Pipe Lining Program

GNHWPCA Pipe Lining Program

Pipe lining is a trenchless rehabilitation process used to repair existing pipelines. Benefits include:

  • pipes can be rehabilitated without disturbing the surrounding neighborhoods and businesses,
  • lining is less expensive than replacing the pipe,
  • it allows for increased sewer flow capacity.
  • the process can be completed in one to three days.

Prior to lining the existing sewer, crews clean the pipe using high pressure water hoses and video cameras to inspect the pipe condition. They may also conduct dye testing to confirm connections between buildings and sewers. As such, residents may see activities related to the sewer relining for several weeks leading

up to the actual lining.

Notices will be provided to residences and establishments in advance of any sewer lining work on their street. Notices will be provided by the GNHWPCA’s contractor both 10 days prior to and 24 hours prior to the conduct of the expected work. Click the links on the right to see sample copy of the 10 day and 24 hour notices.

Click this Pipe Lining Projects link to view locations where pipe lining projects are being implemented and when.