Here’s a statement from the Office of Governor Moore corroborating my thoughts. I found it here from WMAR Baltimore

"The safety of Marylanders is the governor’s highest priority. The water from East Palestine being treated by Clean Harbors is not at levels that would be considered hazardous waste but out of an abundance of caution, the state is treating it as such to ensure our communities are safe. Clean Harbors is a world class facility in Baltimore, and they are well-equipped to handle this project. The administration will continue to work with the federal government to ensure we have the resources and manpower needed to handle treatment in a secure manner."