Our tank water is pretty brown, I haven't got it tested since we moved in, but I don't trust it 100%. Since we're only temporarily here I just boil it in the electric kettle and put it through a brita jug when cooled. When bub comes I'll then take that water and stove boil it for 5 minutes before giving to bubs.
When I have town water I always drink tap water. It took a while to adjust to the different taste of SW WA tap water from Melbourne water, so used a brita jug for a while when we first moved.