I remember number some news when I lived in NJ about 10 years ago.
Some investigating journalists announced that fracking in some areas of Pennsylvania causes increasing amount of radon gas to came up to the surface. Pennsylvania very well know for radon gas leakage in some areas, consequences of it which associated with lung cancer. But as I remember it did not stop fracking and it was continuing.
When was a certain proposal to drench Delaware River in order for bigger barges to pass through (as they claim). But this was halted and proposal did not utilized.
The reason given was that Delaware River has a toxic sludge covered by silt on its bottom, few feet high, due to industrial unrestricted pollution since Philadelphia has its industrial base next to river.
Despite the fact that Delaware River still very polluted, it supplies drinking water to Philadelphia and eastern part of NJ. Even underground water in NJ very bad, I would imagine what would happen to the water supply if they actually start drench the river, luckily politicians came to their senses and stopped the project.
Concerning ground water in NJ, a place there I rent a room in the house, on the backyard of the house was a water pipe with electric motor to pump ground water into the house.
This was very convenient for us and we pay nothing for water supply. But water was very brown in color and had bad smell, so we used it only for shower and dish washing, we did not drink that stuff. Every second of third day we have scrub toilet, sink, and bathroom from thick brown deposit, most of which was iron.
My point is that the water is very precious material and essential for our health. Now I live in different State but still have to spent considerable amount of many to by spring bottled water for cooking and drinking, and fracking surely will make matter even worse.