That is what I thought but yesterday every time I took a sip I felt a bit worse for a bit.  Then I boiled the water and drank and I was fine.  I just read that some tests are showing that water treated in plants are showing higher levels of disinfectants and chemicals than laws allow. So is it that, and how would boiling change that.  Or maybe the water was better cause the water changes at different times and boiling had nothing to do with it.  Should test, but will tests available show chemicals and all other possible problems.  Like Plague is probably not on the test list.  Thats a bad example. Plague is from rats.