In New York, when it rains a tenth of an inch, raw sewage is released along with billions of harmful bacteria and chemicals which flow out into local waterfronts and beaches. Combined Sewer Overflows (CSO) are systems that discharge raw sewage and stormwater into local waterways. The purpose of this project is to determine the concentration and frequency of Enterococcus faecalis among five different sites along the lower Hudson River using the IDEXX Enterolert method. Depending on the location and recent weather it is hypothesized that the concentration of Enterococcus faecalis will vary. Furthermore, it is hypothesized that when there is wet weather in previous days before sampling; the amount of E. faecalis will be higher than on previous days experiencing dry weather.