Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
It can be, but getting good quality water is not just for the fish, but for the whole family.
My Aunt and Uncle lived in a place with a well. The first couple of years the water was OK. Lots of granite, not limestone, so it was soft, and no major amount of iron. Then something shifted, (drought, earthquake... both are common in their area) and probably they started getting water from a different layer.
So high in iron they could not use it any more.
All the fixtures were very badly stained. They could not even do laundry in that water. It smelled horrid.
So, ditto the comments above: The water your neighbor has may not be the same as the water you have. The water you have today may not stay the same.
However, the best thing to do is to talk to the local experts. The ones who have been working in the area long enough to know the local conditions. Get references from the neighbors.