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
2023 CSO Consent Order Modification - Green Infrastructure
2023 Green Infrastructure Modification
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:
- Alley Creek
DEC Comment Letter (PDF)
EPA/DEC Letters (PDF)
Alley Creek Report Cover Letter (PDF)
Alley Creek Report Part A (PDF)
Alley Creek Report Part B (PDF)
Alley Creek Article 78 Petition (PDF)
Alley Creek Amended Article 78 Petition (PDF)
Notice of Amended Verified Petition (PDF)
NYSDEC Memorandum of Law (PDF)
Allen Affidavit (PDF)
Kline Affidavit (PDF)
DiMura Affidavit (PDF)
NYC Approved Long-Term Control Plans (LTCPs)
The NYC approved LTCPs and relevant documentation can be found below:
- Alley Creek
DEC Approval Letter (PDF)
Alley Creek CSO LTCP Final (PDF, 6.79 MB) - Due to this file size it may be easier to open this document in parts provided below.
Alley Creek CSO LTCP Final Part A (PDF)
Alley Creek CSO LTCP Final Part B (PDF)
Alley Creek CSO LTCP Final Supplemental Documentation (PDF) - Bronx River
DEC Approval Letter (PDF)
Bronx River CSO LTCP Final (PDF, 5.07 MB)
Bronx River CSO LTCP Final Supplemental Documentation (PDF) - Flushing Bay
DEC Approval Letter (PDF)
Flushing Bay CSO LTCP Final (PDF, 8.61 MB) - Due to this file size it may be easier to open this document in parts provided below.
Flushing Bay CSO LTCP Final Part A (PDF)
Flushing Bay CSO LTCP Final Part B (PDF) - Flushing Creek
DEC Approval Letter (PDF)
Flushing Creek CSO LTCP Final (PDF, 5.43 MB)
Flushing Creek CSO LTCP Final Supplemental Documentation (PDF)
Flushing Creek CSO LTCP DEC Comments to DEP and DEP Responses (PDF) - Gowanus Canal
DEC Approval Letter (PDF)
Gowanus Canal CSO LTCP Final (PDF, 7.81 MB) - Due to this file size it may be easier to open this document in parts provided below.
Gowanus Canal CSO LTCP Final Part A (PDF)
Gowanus Canal CSO LTCP Final Part B (PDF) - Hutchinson River
DEC Approval Letter (PDF)
Hutchinson River CSO LTCP Final (PDF)
Hutchinson River CSO LTCP Final Supplemental Documentation (PDF)
Hutchinson River CSO LTCP DEC Comments to DEP and DEP Responses (PDF) - Westchester Creek
Approval Letter (PDF)
LTCP (PDF, 9 MB)
LTCP Supplemental (PDF) - Coney Island Creek
Approval Letter (PDF)
LTCP (PDF, 8.88 MB) - Newtown Creek
DEC Approval Letter (PDF)
LTCP (PDF,13 MB)
DEP Response Letter January 2018 (PDF)
DEP Response Letter April 2018 (PDF)
LTCP Supplemental July, 2018, Revised October 10, 2018, Part 1 (PDF, 7 MB)
LTCP Supplemental July, 2018, Revised October 10, 2018, Part 2 (PDF, 7 MB) - Jamaica Bay and Tributaries
DEC Jamaica Bay LTCP Approval Letter (PDF)
Jamaica Bay and Tributaries LTCP (PDF)
Jamaica Bay and Tributaries LTCP Final Supplemental Documentation (PDF)
