My London water was brilliant compared with the crap I get now. We have now gone to bottled water.I think it depends what part of the country your in, I used to live in London the water there is Pony so a filter really help's get the scum out.
Oh you know why, they now recycle Thames water and pipe it back to us in London, they have a new desalination plant in Becton! I hate to consume my own waste water too, even though it may have been filtered!