A team of researchers from the University of Windsor and the University of Saskatchewan have discovered that methane can naturally migrate upwards through shale over millions of years and reach groundwater without any industry influence.“Upward migration of methane through low-porosity zones raises awareness that groundwater wells can be naturally contaminated by deeper sources of methane,” says Scott Mundle, an assistant professor of chemistry in the Great Lakes Institute for Environmental Research. “This is an important consideration when investigating potential causal links between fracking and an impacted water well.”