Brandywine Conservancy http://www.brandywineconservancy.org/conservancy.html
Buck and Doe Run Watershed Partnership http://buckanddoerunwatershed.org/
Chesapeake Bay Foundation http://www.cbf.org
Chester County Conservation District http://dsf.chesco.org/conservation/cwp/browse.asp?a=3
Chester County Water Resources Authority http://dsf.chesco.org/water/site/default.asp
Christina Basin Water Quality Management Strategy http://www.wr.udel.edu/cb/index.html
Delaware Nature Society http://www.delawarenaturesociety.org/
Delaware River Basin Commission http://www.state.nj.us/drbc/drbc.htm
Delaware Riverkeeper http://www.delawareriverkeeper.org
Green Valleys Association http://www.greenvalleys.org/nfhome.asp
Penn State University Chester County Extension Office http://chester.extension.psu.edu/
Pennsylvania Department of Conservation of Natural Resources http://www.dcnr.state.pa.us/
Pennsylvania Department of Environmental Protection http://www.depweb.state.pa.us/dep/site/default.asp
Pennsylvania Fish and Boat Commission http://www.fish.state.pa.us/mpag1.htm
Water Resources Agency at the University of Delaware http://www.wr.udel.edu/
White Clay Creek National Wild & Scenic Rivers Program http://www.whiteclay.org/
White Clay Watershed Association http://home.ccil.org/~wcwa/index.html

Clean Water Network http://www.cleanwaternetwork.org/
National Fish and Wildlife Foundation http://www.nfwf.org/AM/Template.cfm?Section=Home
National Institutes for Water Resources http://niwr.montana.edu/
Natural Resources Conservation Service http://www.nrcs.usda.gov/
Pennsylvania Organization for Watersheds and Rivers http://www.pawatersheds.org/
United States Environmental Protection Agency http://www.epa.gov/
United States Environmental Protection Agency, Region III http://www.epa.gov/region03/index.htm
United States Geological Survey http://www.usgs.gov/
Watershed Management Council http://www.watershed.org/wmc/index.php

International Rivers: People, Water, Life http://internationalrivers.org/