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Nitrogen Endpoints Memorandum Available Now for Public Comment

The United States Environmental Protection Agency (EPA) welcomes the public to read and comment on: Establishing Nitrogen Endpoints for Three Long Island Sound Watershed Groupings” (Subtask F&G Memorandum). Click here to view the Memorandum.

The Subtask F&G Memorandum explains how three parallel lines of evidence–a literature review, a distribution-based approach, and a hierarchical stressor-response model created with water quality monitoring data–were used to develop a range of protective nitrogen concentration endpoints. Background documents, including those that contributed to the Subtask F&G Memorandum, can be found below.

Please review the Memorandum and email comments to:  no later than  Dec. 14, 2018.

EPA is seeking only specific, technical comments on the scientific and methodological merit of this document. EPA is not seeking recommendations for alternative methodologies or comments on policy matters. All relevant technical comments will be reviewed and considered though EPA does not anticipate conducting a formal, individual, response-to-comment for this document’s public release.

What is the Nitrogen Reduction Strategy?

EPA is implementing a strategy to aggressively continue progress on nitrogen reductions, in parallel with the States’ continued implementation of the 2000 Total Maximum Daily Load (TMDL), and achieve water quality standards throughout Long Island Sound and its embayments and near shore coastal waters. The strategy recognizes that more work must be done to reduce nitrogen levels, further improve dissolved oxygen (DO) conditions, and address other nutrient-related impacts in Long Island Sound. The nitrogen reduction strategy complements the 2000 TMDL in important ways. Foremost, while the 2000 TMDL is premised on achieving water quality standards for DO in the open waters of LIS, the EPA strategy expands the focus to include other nutrient-related adverse impacts to water quality, such as loss of eelgrass, that affect many of LIS’s embayments and near shore coastal waters.

The following documents will help you learn more about the strategy.

EPA Nitrogen Strategy Phase 1 contract deliverables:


Ongoing Public Outreach:

  • Letter to each of the states in the Long Island Sound watershed with attached nitrogen strategy on December 23, 2015.
  • Public webinars on Feb 26, 2016, Dec 19, 2016, Nov 8, 2017.
  • Formation in 2017 of a Technical Stakeholder Review Group), which includes all watershed states, NYC, Suffolk County, New England Water Pollution Control Commission and other groups collecting water quality data.
  • Ongoing EPA-State meetings both in-person and conference calls on N strategy:  New York State Department of Environmental Conservation, Connecticut Department of Energy and Environmental Protection, Massachusetts Department of Environmental Protection, Vermont Department of Environmental Conservation, New Hampshire Department of Environmental Services.
  • Ongoing technical coordination meetings with Long Island Nitrogen Action Plan (LINAP), Suffolk Co, and CT Second Generation Nitrogen Strategy-Niantic River Project Team.
  • Public meetings in 2016 held at the Stamford Government Center, CT on April 13, the Huntington, NY Town Hall on April 15, and the Pioneer Valley Planning Commission in Springfield, MA on May 12 * Public presentations in 2016 at the May 3 Latitude 41 Conference and the September 21 Connecticut Environmental Health Association Conference.
  • Meetings and calls at the request of the CT River Advisory Group (several WWTPs in MA and the Pioneer Valley Planning Commission), National Association of Clean Water Agencies, Connecticut Fund for the Environment, and others.



Learn More

Long Island Sound Nitrogen Reduction Strategy – Informational Webinar

Date: Thursday, Nov. 29, 2018
Time: 11:00am-12:00pm (EST)

Webinar link: Go to EPA web conferencing
Dial-In Number: 202-991-0477
Conference Code: 3409912

If you receive busy signal, please use the following link to Find a local number
*This webinar may be recorded. No registration is necessary.

Webinar agenda: EPA and its contractor, Tetra Tech, will provide an update to the public on progress the Long Island Sound Nitrogen Reduction Strategy; overview ongoing work, including Task F&G Memorandum; and highlight next steps. Time for questions will be included at the end of the webinar.

The Strategy recognizes that more work must be done to reduce nitrogen levels, further improve dissolved oxygen conditions, and attain other related water quality standards in the Long Island Sound.

Questions? Please email

Stay Up-to-Date with the Latest Documents and Presentations


Subscribe to Nitrogen Reduction Strategy Update

Want to keep up with the latest information on the Long Island Sound EPA Nitrogen Strategy? Go to the Nitrogen Reduction Strategy Update form to subscribe to Nitrogen Reduction Strategy Update to get notified in your inbox of the latest reports, presentations, and data that’s posted on the Long Island Sound Study nitrogen reduction strategy web page.


Comment on the EPA Nitrogen Strategy

EPA encourages your technical feedback on the Long Island Sound EPA Nitrogen Reduction Strategy.  Go to the Nitrogen Strategy Comment form to submit your comments about the reports and documents posted on this page. The comments will be sent to the EPA New England Regional office in Boston, which is helping to manage the Nitrogen Strategy.

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