Image: EXPO Gowanus, Gowanus Canal Conservancy

Factsheets & Reports

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SWIM and its partners regularly publish briefing materials on critical stormwater issues. These factsheets and reports are meant to educate and empower local communities, public officials, businesses, and media. 
Click the images to open the PDFs.

Find more information and resources in Our Work and External Resources.


Don't see what you're looking for? Contact us.​

Workbook: How to be a Clean Water Steward

Workbook: How to be a Clean Water Steward

This is SWIM's guide for water users, community organizations, and concerned citizens to respond to the City’s Long Term Control Plans to reduce Combined Sewer Overflows.

Factsheet: Municipal Separate Storm Sewer (MS4s)

Factsheet: Municipal Separate Storm Sewer (MS4s)

Our MS4 factsheet is a useful guide to better understand where and how these storm sewers work, as well as how to alleviate some of the pressures put on them.

Factsheet: Combined Sewer Overflow (CSO)

Factsheet: Combined Sewer Overflow (CSO)

​The CSO factsheet explains why exactly overflow events pose such a threat to NYC’s water quality, and some of the measures the City and State are taking to address them.​

Factsheet: CSO Long Term Control Plans (LTCP)

Factsheet: CSO Long Term Control Plans (LTCP)

Here is an overview of the Long Term Control Plan process, waterbody-specific strategies to reduce CSO events. We believe it is critical that local stakeholders have a voice in the plans. Below are factsheets based on the latest LTCPs drafted by the City.

Clean Water Principles for New York City

Clean Water Principles for New York City

​Many SWIM organizational members have also signed onto our Clean Waterway Principles for New York City, meant to ensure fishable and swimmable waters citywide. These principles have been shared with DEP and DEC, as well as with the NYC Council, borough presidents, NYC Mayor’s Office, and other elected officials. Their foundation includes:

  • Ensure decision making is inclusive and transparent

  • Meet federal health standards

  • Focus on reducing volume and frequency of CSOs throughout the city

  • Do not kick the can down the road

  • Prioritize green infrastructure

  • Protect communities and guarantee equity

  • Protect fish and coastal habitat by reducing nitrogen pollution

  • Develop smarter and fairer approaches to funding water quality infrastructure

  • Use a holistic planning approach to address all pollution sources in all New York City waters

waterbody-specific LTCP Action alerts

In March 2017, the New York State Department of Environmental Conservation (DEC) approved five long term control plans (LTCP) submitted by the New York City Department of Environmental Protection (DEP).

SWIM and our partners are concerned that the proposed plans, which can be found on the DEP's website, will leave behind hundreds of millions of gallons of completely untreated sewage overflow per year. Red more in our action alerts below:

waterbody-specific factsheets

Want to learn more about the issues that impact your local waterway? Check out SWIM's factsheets: