USNavy.Potable_water_test_150515-N-SB233-112A town in Kansas with 650 residents, writes Brett Walton (@waltonwater), needs $2.4 million to remove dangerous levels of nitrate in its water. In Circle of Blue, Brett reports that Pretty Prairie isn’t the only farm town with this problem. Agricultural areas across the country are trying to stop fertilizer nitrate from entering the groundwater, or get it out once it’s there. image: US Navy