At the moment my municipal water is excellent. It comes from the Hetch Hetchy system which catches snowmelt in the Sierra Nevada mountains and delivers it to local reservoirs for chloramine treatment and distribution. I have had it tested by Ward Labs and all the minerals are very low. It is high pH (8.6 - 9.6) but that isn't a problem. I am somewhat boggled that we use this outstanding water for flushing our toilets at the same time that farmers and fish are competing for water from the same rivers and fresh water is sometimes in short supply.
Now there is talk that our local water agency may start to use recycled wastewater. Cities could sign up to deliver wastewater to be purified and then delivered back to them in times of need. Many local cities already used recycled water for landscaping but not for consumers. I'm not sure how I feel about this. It would almost certainly change how I need to treat my water for brewing, but it seems as if it is inevitable and, if done right, a good solution to our water shortages.