I also don’t know anyone who uses a Brita filter. I prefer tap water and have never had to boil it but I’ve mainly lived in large cities in southern Ontario, Canada.
However for a few months when I lived in a very small town (< 250 people) and the house I rented got water from a well – at that point I drank only bottled water. The well water turned the shower wall orange so I really wasn’t keen to drink it.
Based on this source the issue has been fixed but the instance owners need to update to the latest version of Lemmy (v 0.18) which has the fix.