(I know I'm continuing the hijack of this Catskill thread...)
I drink King Philip's Spring water all the time (even though the pipe has a little green stuff in it), and I've never experienced any ill effects in about 22 years of drinking it.
There used to be a "King Philip's Spring" historical sign at the spring (something about "stopping threre to water the men and horses"). That disappeared quite a number of years ago. At the time, I was curious and I contacted DEC to ask if there was some issue with the spring. After I pushed a little, DEC told me that they actually did periodically test that water (at that time, years ago), because it was known to be used by so many people, and that it was fine. Don't know if anyone still tests it (and I still don't know what happened to the sign).
As an indicator of continuing maintenance, in the last two or three years a concrete pad and a drain hole have been added below the pipe.
With the number of people that use that spring, I think if there was any issue with the water, it would make the news pretty fast.
TCD