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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.

NEW:  The summary report of an independent technical review for two key deliverables of the Long Island Sound Nitrogen Reduction Strategy  is now posted on the Long Island Sound Study website. The two products reviewed are: Subtask F/G: Summary of Establishing Nitrogen Endpoints for Three Long Island Sound Watershed Groupings, and Subtask E: Summary of the Hydrodynamic Analysis Conducted to Relate Tributary Loads to Areas of Influence and Relative Contributions to Embayments.  Read a description of the purpose and scope of the External Review here. Find the External Review document here.  See below for the subtask memos  in the project deliverables list.

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

EPA Nitrogen Strategy Phase 2 contract deliverables:

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.



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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