Even without floods, multiple Ohio sites already have been found to have elevated contaminant levels in groundwater.
The pollution control board will hold additional public hearings to determine a remedy for the violations.
An industry-backed effort aims to end ORSANCO’s role in setting and enforcing pollution standards.
Groundwater contamination has been detected at a majority of the state’s 37 coal ash ponds, some of which are unlined.
Critics say the Democrat has done too little to address coal ash pollution, but that could change in 2019.