There was a huge dump site up on North River road that closed years ago. I believe it was forcibly closed by enacted environmental laws . It actually overlooks the river across from old Shenango Steel. There is a cemetery across from it ( how coincidental ). That dump took in tons and tons of waste in its day until closed. Ironically it's also above (upstream) our drinking water process plant. One has to trust or wonder how safe that continues to be.
Shenango Steel , Sharon Tube , Westinghouse, National Castings, Sharon Steel , Wheatland Tube all were built and had river access for years. The river was in bad shape in those days as far as pollution. Now most are gone and environmental laws have put in many usage restrictions. Maybe late but never the less much safer.
A few years back there was a small business in Sharon along the river and the owner was rolling and dumping out barrels of used chemicals or oil waste from his place into the river at night ! The low life was finally nailed and arrested but I forget the final outcome. One has to wonder how long did this pig do this and I hope he served some stiff jail time and fines.
As far as that dredging of river sediment that was done years ago and Westinghouse was held for most of that cost since they admitted to PCB contamination in and around the plant. I was told the fear of PCB future lawsuits was one of the main reasons for shutting the plant down. I worked there for a few short years and the PCB's were in the transformer oils that cooled the large transformers we built. It was actually a clean plant inside and I seen no actual bad handling of oil and chemicals , but who knows what went or leaked into sewer systems with a plant almost a mile long!
It's too bad about Shenango's PCB pollution problem it's actually loaded with fish and wildlife all along it's banks. I've spent years of outdoor time there and still do .