The Marstons Mills River is the connection between our groundwater and the Three Bays Estuary. Because of this, BCWC water sampling assistant and water stewards focus on monitoring the chemical makeup and waterflow at multiple points along the river once a week. We do this by taking small bottle water samples that are then sent to the Barnstable County Water Quality Lab to be tested for total nitrogen. We measure the velocity of the stream using a current meter. This is important because what we are seeing right now is the groundwater that has been impacted by the septic systems on Cape Cod from decades ago. With the data collected, we are able to create new and improved technologies to make our water cleaner!