In January, the Monday Buzz brought you a story about endocrine disruptor chemicals in the groundwater in northeastern Wisconsin. Now we learn that those chemicals are only the tip of the iceberg. In an area of the state highly susceptible to groundwater pollution due to the thin soils and permeable karst geology, most people’s well water is considered undrinkable, due to a variety of pollutants, including nitrates and traces of herbicides and pesticides. The likely culprit agriculture. With a planned expansion of a dairy farm in the area to over six thousand cattle, many are questioning the state’s ability to protect its groundwater. The Center of Investigative Journalism’s Kate Golden and Ron Seely have been following this story since its inception. They joined the Buzz on March 3, 2014 with an update.