In parts of Kansas, decades of farming and irrigation have left groundwater polluted with enough nitrates that it can be used in place of some of a farmer’s fertilizer. In a year with high input costs and low yields, farmers need to get creative with cost cutting. The polluted groundwater could be a trick up their sleeve to save on fertilizer costs. Of course, pollution also comes with downsides, and experts warn that the nitrate-laden groundwater could have impacts on people’s health.