Back against the well or wall as they say.

That's an interesting question. Maybe the geologist will chime in.

This is nothing more than a guess, but I'm guessing that it'd come with the methane. Meaning, on a general level, no. Gas isn't migrating upward through rock all over the place, and neither should radon.

However, it could come up at the actual drill hole. If all the seals work correctly, at worst it'd be vented to the atmosphere and cause no harm (radon is generally only a problem when its trapped and the concentration is allowed to increase over time, like below foundations). But when the seals leak, we know that the wells are capable of contaminating the water table with methane, and I see no reason why radon couldn't come with that.
 
Geiger counters are used around wells and flow back all the time...no readings above background to this date and all waste is tested by landfills before it gets through the gates.
 
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