That doesn't appear to be well enforced as otherwise companies wouldn't be able to get away (or at least maybe receive a fine at some point) with illegal activi

That doesn't appear to be well enforced as otherwise companies wouldn't be able to get away (or at least maybe receive a fine at some point) with illegal activity. If a company is illegally dumping chemicals into the water, then there has to have been at least one instance where a higher up instructed employees to do so.