Of some interest.
Nat gas wells are 5-7,000 ft deep, water wells are a couple hundred feet deep. The fracking of wells is done in tight shale formations which are far below where water wells are located. As long as the drilling company uses proper procedures in lining the well with stell casing before fracking, the chance of these chemicals getting into the water bearing areas far above is 0.
So they inject methanol and the like into fields containing methane, ethane, propane, crude oil, etc.
Are people trying to claim a crude oil field was their water supply.