But not in the way you say it. I'd actually say it's quite the opposite of what you just said on this narrow issue. I'm happy to talk about where there are risks, but you're talking about an area in which there really aren't any risks.
First of all, we're fracking one or two kilometres under the ground. We're taking gas that's been there for a few hundred million years without being able to get out because of the impermeable rock layers above it. Yes, that water is down, and yes, it stays there, but it's staying in a place that has been able to contain natural gas, a far more buoyant thing than water. I think the Ground Water Protection Council has published a report saying that the potential for that kind of water to reach the surface is less than one in 200,000,000, or something along those lines.