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Combined Sewer Overflow

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The Department is committed to working with Combined Sewer Overflow (CSO) permittees and CSO communities to reduce or eliminate CSOs. The Department will assist permittees in meeting their permit obligations by providing technical assistance, guidance, and training.

The individual CSO permits, effective on July 1, 2015, encourage permittee and community collaboration on the planning and development of projects that will provide urban redevelopment opportunities, improve water quality, beautify neighborhoods, and improve the overall quality of life in our urban communities.

Since the issuance of the first NJPDES permits to regulate CSOs, the total number of CSO outfalls in New Jersey has been reduced from 281 to 210; a reduction of more than 20%. Additionally, solids and floatables controls have been installed at nearly every CSO outfall to prevent solids that are greater than one half inch from entering the waterway.

The 25 individual permits, issued March 2015, cover the remaining outfalls in 21 municipalities.  The individual permits including the response to comments document can be found on the toolbar.  These permits build upon the previous general permit requirements; permittees should consider what work has already been performed and how past achievements may be incorporated into new efforts to satisfy the new individual CSO permit requirements.

The goal of the CSO permits is to meet the requirements of the Clean Water Act and the National CSO Policy by reducing or eliminating the remaining CSO outfalls in New Jersey.  In order to achieve the reduction or elimination of outfalls, CSO permittees will need to reduce flooding, ensure proper operation, maintenance and management of existing infrastructure and provide opportunities for green infrastructure.  These permits reinforce the importance of properly operated and maintained water infrastructure systems in protecting public health and the environment and supporting economic redevelopment.  A major emphasis of the permit process is the development of regional strategies to reduce the amount of storm water that flows into combined sewer systems, through the development and implementation of a Long Term Control Plan.


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Department of Environmental Protection
P. O. Box 402
Trenton, NJ 08625

Last Updated: October 5, 2022

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