http://www.nrdc.org/water/
http://environment.nationalgeographic.com/environment/freshwater/pollution/
http://wwf.panda.org/about_our_earth/teacher_resources/webfieldtrips/water_pollution/
http://water.epa.gov/aboutow/owm/wpollu.cfm
http://www.eoearth.org/topics/view/51cbfc84f702fc2ba812bc31/
http://thankyouocean.org/threats/water-pollution/
http://www.sciencedaily.com/terms/water_pollution.htm
http://www.chewonki.org/cleanwater/water_pollution.asp
http://www.conserve-energy-future.com/various-water-pollution-facts.php
http://environment.nationalgeographic.com/environment/freshwater/pollution/
http://wwf.panda.org/about_our_earth/teacher_resources/webfieldtrips/water_pollution/
http://water.epa.gov/aboutow/owm/wpollu.cfm
http://www.eoearth.org/topics/view/51cbfc84f702fc2ba812bc31/
http://thankyouocean.org/threats/water-pollution/
http://www.sciencedaily.com/terms/water_pollution.htm
http://www.chewonki.org/cleanwater/water_pollution.asp
http://www.conserve-energy-future.com/various-water-pollution-facts.php