The West Virginia Department of Environmental Protection says it's issuing a moratorium on injecting coal slurry into mines.
The agency says the practice won't be allowed at any new sites, despite a study sent to the Legislature Thursday that finds no evidence slurry injection alone affects surface water quality. Lawmakers ordered the agency to conduct the study more than two years ago. Currently slurry is pumped into about 15 mines.
DEP says the study shows material in the mix of chemicals, dirt and mud can end up in water at mines where slurry is injected. But the agency says the materials don't show up in surface water.
Additionally, DEP says water from two public systems that draw from mines where slurry has been injected meets federal standards.