On Wednesday, the Environmental Protection Agency ordered Norfolk Southern to conduct additional cleanup and sheen investigations in Leslie Run and Sulphur Run creeks in East Palestine and the surrounding areas. 

This comprehensive study under the Clean Water Act calls for the investigation of oily sheens and sediments among water surfaces in the area, to be conducted alongside regular surface water checks that have been happening since February.

According to the EPA press release, the study does not cover drinking water, as there is no indication of risk to private wells or public water consumption in East Palestine.