If you're on a well, no one is testing your water
Much of back-country Greenwich, New Canaan, and Weston runs on private wells — which means no utility, no annual report, and no required testing at all.
Public water comes with a paper trail: a utility, federal monitoring, and a yearly report. Private wells come with none of that. If your home draws from a well — common across the back-country and the larger lots in our service area — the responsibility for knowing what's in your water is entirely yours.
That's not a reason to worry; it's a reason to measure. Wells can be excellent. They can also carry naturally occurring metals, nitrate from surrounding land, or seasonal changes that no one would ever flag, because no one is required to look.
The whole-home approach is the same as for municipal homes — test first, design the system to what the test shows, then re-test to prove it worked. The difference is that for a well, that test is often the first real look anyone has taken.