Some time ago, I saw something on TV about how fracking was contaminating the local ground water with methane. As a result, when a nearby resident put a match to their kitchen faucet, the water would actually light on fire!
The residents and farmers could not drink the water from their own taps. Nor shower with the water. Showering affected the skin in a horrible way. They did not dare drink the water, as it would do the same thing to the inside of the body, with no way to relieve it! All their water needed to be trucked in, at significant expense.
HyCap Energy in Wyoming has come up with an expensive ($55K) device to clean the water of methane. It extracts methane from the water, allowing it to be used as energy. Apparently, if there is enough methane, they will install the equipment at their own expense, and share in the revenues.
But recently, I thought of a simpler way to clean the water of methane.