All that is necessary so that water is fit for consumption. But that does not make water suitable for fine teas.
Close to the Alps in Europe, where i come from, we have great water - to drink. But it is one of the most unsuitable waters for tea possible - it's hardness suppresses all subtleties of the more complex finer teas.
I can only advise to make your own tests with different kinds of water, and tea brewed with each parallel in similar pots and cups. If one isn't lucky to live close to a spring with natural water suitable for tea, you may end up with having to use bottled water such as Volvic if you want to get the best out of your tea.
If i do not have access to good water, i will drink more robust teas such as Liu Bao which are less sensitive to water, far cheaper and not very rare unlike my best teas, which i only get occasionally and in very small quantities.
Good tea needs good water, good pots and good cups - there is no way around that.
I am not saying the water is great for tea, I was just addressing the tone that all public water is completely unfit for consumption across the world. In fact when I was in Pennsylvania I did test a few different bottled waters, and after researching one of them I found that it has the exact same water source as the source of the public water for Bethlehem.
Another small note that I left out of my original post, at least in the United states, what comes out of your tap is highly more regulated, and controlled than what you can find in bottles.