BCWC tests for Nitrate, TKN (Total Kjeldahl Nitrogen, or the total concentration of organic nitrogen and ammonia) and measures the velocity of water running through the entire river system at ten stations. Temperature is also measured at each site. While out on the river, we collect water samples from every location that are taken for analysis at the Barnstable County Department of Health and Environment’s Water Quality Laboratory. By compiling all this data, we can determine the amount of nitrogen moving through the river each day.