A study measuring the quality of water in the Grand River found the majority of pollutants are coming from municipalities upstream and are concentrated around Fairchild Creek. Pesticides, e-coli, and human waste by-products are all present in the Grand River but the state of the art treatment plant in Ohsweken is filtering most of that out, according to one of the study authors, Marsha Serville-Tertullien, from Trent University. She recommended Six Nations tell municipalities up stream to clean up their act in order to reduce potential contaminants in Six Nations’ drinking water.