Comment by donnachangstein

> but do people brew green tea or good coffee with tap water?

I use filtered tap water (under-sink type) which removes most of it.

A lot of the higher end coffee makers like Keurig have built-in filter cartridges in the water tank.

Most commercial coffee maker setups I've seen (hard-plumbed) in offices have a filter attached to the plumbing behind the appliance.

Water can be safe/potable and taste terrible, and vice versa.