Riverkeeper partners with more than 40 institutions and over 160 individuals to sample more than 400 locations throughout the Hudson River Watershed monthly from May through October. The data collection measures concentration of the fecal indicator bacteria Enterococcus (Entero) using EPA-approved methods. Results are reported in Entero count per 100 mL of water. Entero is present in the guts of warm-blooded animals, and while it is used to detect the likely presence of untreated human sewage, in some cases it may also indicate the presence of fecal contamination from geese, cattle or other animals. Riverkeeper measures results of water samples based on the EPA’s Recreational Water Quality Criteria, which New York State is currently using to update state Water Quality Standards. » Continue Reading.