Delaware has numerous inland waterways with high microbial impairment from unknown sources. Now, a new study suggests that human waste, both treated and untreated, is responsible for the waterway impairment in these Delaware watersheds. The study was published in Applied and Environmental Microbiology. Delaware has numerous inland waterways with high microbial impairment from unknown sources. Now, a new study suggests that human waste, both treated and untreated, is responsible for the waterway impairment in these Delaware watersheds. The study was published in Applied and Environmental Microbiology. Ecology Cell & Microbiology Phys.org – latest science and technology news stories