Department of Environmental Protection
http://www.nyc.gov/html/dep.html

Get Interactive and Help Clean Our Water and Oceans
http://www.nrdc.org/water/pollution/gsteps.asp

Beaches.com (check on the status of your local beach)
http://beach.com

Honors College
http://honorscollege.cuny.edu

NY Beach Cleanup Statistics (see what surprising things wash up on the shore)
http://www.alsnyc.org/cleanup.htm