452 SHARESEditors note: This is the third of four stories on coal ash pollution in the Great Lakes region. By Meredith KatzNo one region of Illinois is safe from contamination of groundwater from coal ash. “At every ash dump in Illinois where groundwater has been tested, toxic coal ash pollutants are leaking into groundwater,” said Colleen Smith, legislative director for the Illinois Environmental Council. The Environmental Integrity Project says Illinois has 16 sites where coal ash has contaminated the groundwater. Monitoring under the federal Coal Ash Rule revealed coal ash pollutants in groundwater at 16 plants around the state.