before oil prices came down and it was profitable to run these tiny fracking wells the closest one to me was about 5 miles away yet my well water had an oil slick when you let it settle
The additives in these operations are trade secrets and not agricultural products, like oil, so I doubt they are tested for. I have no idea which ones are available for plants to uptake, but I would love to see some extensive tests looking into just that. Your organic produce might not be...
Next move will be to the Pacific NW in part because it's one of the few places in the US we aren't poisoning the water supply via fracking