The survey of more than 100 waterways downstream from treatment plants and animal feedlots in 30 states found minute amounts of dozens of antibiotics, hormones, pain relievers, cough suppressants, disinfectants and other products. It is not known whether they are harmful to plants, animals or people. The findings were released yesterday on the Web site of the United States Geological Survey, which conducted the research, and in an online journal, Environmental Science and Technology.