I am not so sure but it bothers me a great deal. Even in Europe, I am concerned that there are pollutants we are simply not informed about, or even aware of. How to manage it? There are of course various filtration methods but it is not so clear to me whether they actually work. I am concerned about the lack of scientific clarity on these methods that could be employed in the home. Unfortunately, though, many industrial activities will nonetheless pollute the waters no matter what we do at home. It may not be enough.