It’s amazing how many chemicals are out there and the long term effects they are creating yet it’s pretty much kept quiet unless it directly impacts you or someone you know.This stuff is used so commonly that it could come from about anywhere. The only manure that I would feel safe using would be from a barn that feeds ONLY alfalfa. Thought I had contaminated my soil with this last year but now believe it was other factors. One variety of tomato was curling, others grown in the same soil did not. Hope you are able to get this out of your soil. Is fine distributed on a lawn. They say corn grows well in it but I wouldn’t want to knowingly eat it.