I rarely drink just plain water. Filtered tap water, like they have at fast food places and restaurants, is okay as well as is bottled water. But I don't like the tap water much here in Denver although it's better than most places. I absolutely hate water that has a chlorine taste, and nearly all places I've lived have had that problem.
Edit: I should also note just how sorry I feel for those in SoCal that get their water from the Colorado River. Right above Davis Dam on the Colorado River (next to Laughlin, NV and Bullhead City, AZ) there are signs that warn against swimming in Lake Mohave right above Davis Dam due to the pollution in there. Even below Davis Dam the water is still not drinkable, any river water that is used has to be very heavily filtered and the cities usually just get their water from aquifers and wells near the river. And the stuff was still pretty bad. IIRC, the canal going to the LA area from the Colorado River is downriver from Parker Dam so maybe the water is slightly better down there but I can't imagine it being drinkable. Same in Phoenix, the Arizona Canal goes from the Colorado River to near Phoenix and the water in Phoenix is pretty nasty.