If the water in question is contaminiated, how did that happen?
Some painter dumped a few cans of solvent on the ground and it seeped in, as one possibility.
I would guarantee you that the backyards of most rural (and maybe even non-rural)Americans would be declared Superfund sites by the EPA from all of the used motor oil and solvents from house paintings dumped in the ground.
It's like this. The water is in the GROUND. So is everything else on the planet, except for most of the atmosphere.
The ground contains oil, in it's various forms, on a natural and repetitive basis.
There are various chemicals and compounds found in ground water, and they can come from a variety of sources. Water not only flows along through rivers, but also under rivers, and even under deserts. The source of a particular contamination can be from very far away.
The EPA is crying wolf in order to run certain companies out of business, at the request of the DNC and the Obama Administration.