In Dallas, there's an old joke about the fish in the Trinity River swim backwards so they don't get the water in their eyes.

It always amazes me how there's all of the old black&white film of industrial waste just pouring into whatever water was nearby (river,lakes,etc). However, we know it still happens today, they just get more sneaky about it. Again, in Dallas, a slaughter house was found to be dumping blood and waste into the river by a drone flying over head and the color of the water had an obvious color change to it.