New York City CSO

2005 NYC CSO Consent Order

The New York City Department of Environmental Protection (DEP) is required under a 2005 Order on Consent to reduce combined sewer overflows (CSOs) from its sewer system to improve the water quality of its surrounding waters, such as Flushing Bay, Jamaica Bay, and tributaries to the East River, Long Island Sound, and Outer Harbor.

Under the 2005 Consent Order, the DEP has completed Waterbody/Watershed Facility Plans, which are the initial phase of CSO planning, and are required to construct various grey infrastructure projects, and develop Long-Term Control Plans.

2008 CSO Consent Order Modification - Miscellaneous

The 2008 CSO Consent Order modification resolved various violations.

2009 CSO Consent Order Modification - Flushing CSO Tank

The 2009 CSO Consent Order modification to the resolved a violation related to the Flushing CSO tank.

2012 CSO Consent Order Modification - Green Infrastructure

In 2011, the New York State Department of Environmental Conservation (DEC) and DEP identified numerous modifications to the CSO Consent Order, including integration of green infrastructure and substitution of more cost-effective grey infrastructure, (2012 CSO Consent Order) and agreed to fixed dates for submittal of the Long-Term Control Plans.

2014 CSO BMP Order

On May 8, 2014, the NYSDEC and NYCDEP entered into an agreement for the monitoring of combined sewer overflow compliance, reporting requirements for bypasses and notification of equipment out of service at the WWTP during rain events. The 2014 CSO BMP Order incorporates, expands, and supersedes the 2010 CSO BMP Order by requiring NYCDEP to install new monitoring equipment at identified key regulators and outfalls and to assess compliance with requirements to "Maximize Flow to the WWTP". A NYCDEP map identifying the WWTP interceptors and key regulator locations is also available.

2015 CSO Consent Order Modification - 26th Ward and Wards Island

The executed, March 26, 2015, Modification to the NYC CSO Consent Order (PDF).

2017 CSO Consent Order Modification - IEMS

The 2017 IEMS CSO Consent Order modification expanded the responsibilities of the independent environmental monitors to work on the MS4 permit.

2017 CSO Consent Order Modification - Bergen Basin

The 2017 Bergen Basin CSO Consent Order modification added new milestones for completion of a sewer lateral for Bergen Basin.

2018 CSO Consent Order Revised Appendix A

2018 Revised Appendix A ( PDF)

2021 CSO Consent Order Modification - Rockaway WWRF

The 2021 CSO Consent Order modification resolved a violation related to the Rockaway WWRF.

2022 CSO Consent Order Modification - Flushing Bay Tunnel

2022 Flushing Bay Tunnel Modification

2021 CSO Consent Order Revised Appendix A

2021 Appendix A (PDF)

2023 CSO Consent Order Modification - Green Infrastructure

2023 Green Infrastructure Modification

2023 CSO Consent Order Revised Appendix A and Appendix C

2023 Appendix A
2023 Appendix C

NYC Waterbody/Watershed Facility Plans (WWFP)

The four New York City WWFPs can be found in the right column "Links Leaving DEC's Website" section of this page.

NYC Long-Term Control Plans (LTCPs)

The NYC submitted LTCPs and relevant correspondence can be found below:

NYC Approved Long-Term Control Plans (LTCPs)

The NYC approved LTCPs and relevant documentation can be found below:

Clarification of NYC Long-Term Control Plans

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Region 2 - New York City
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