No question that it is traveling through the watersheds, but I think it’s a bit irrational to think that the material has completed the entire water cycle of being spilled, hitting a river, diluting in the body of water, evaporating, joining the preexisting rainy conditions, which would dilute it again, and then falling as rain in south central PA in a density that would be noticeable to the OP.

There’s plenty of reasons to be concerned with the effects of this incident, I just don’t think this is one of them. 👍