Periodic Water Testing
Well water is fantastic and refreshing, and water from your catskills real estate can be fresh as the day is long. But still, when something is drawn from 400' in the ground and then runs through a bunch of plastic, holding tanks and faucets, it's not hard to see how purity can be impacted (and fortunately, somewhat easily corrected).

Testing your water once a year by an area professional is never a bad idea. They can test for 'potability', meaning safety (bacteria) as well as for hardness, softness, iron, sulphur, etc....
We like Titan Wells and Water Treatment out of Arkville for those who live in Ulster County, but there are others that probably do a fine job too, like Aqua Check (http://www.aquacheckllc.com/). Valley Water (https://valley-water.com/) is a fine company for those with real estate in Sullivan County.