When our house was originally built, it had a well... Our well is 60 foot deep with a 30 foot water table...
However I'm less than 7 miles from Argonne National Laboratory where they had the Manhattan Project... When it was over, they buried all 7 reactors in the forest preserves around there... One of them is under a lake and they buried it with cement walls and a cement cap on top... They found out many years later that the radiation leaked out into the lake... They had to drain the lake and make a concrete slab, then concrete walls, and finally cap it in concrete.... The radiation leaked out the bottom.... Doh!!!
So I suspect that the radiation has contaminated the aquaphor by now and there may be radiation in our well...
Luckily we have been converted to Lake Michigan city water now...