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.
A report based on coal companies’ own self-reported data shows widespread contamination of ground and surface water.