Tap water in Scandinavia is the best I have ever tried. Tap water there (especially during Winter months) tastes as good or better than Fidji. It is simply fantastic and not within margin, even people skeptical or indifferent to taste of their tap would notice the water quality there.
Since I have moved to Belgium I filter all my drinking water here & even have filters to remove calcium from my shower taps. Belgium, Holland and N. France have too much chalk in the ground, and while it contributes to really good wines , it does nothing for your food, coffee/tea, hair or pots and pans.
As Russians say ,:" If you have not tried anything sweeter than carrots , carrots are the tastiest food in the whole World".
I'm sure there are some places where tap taste is noticeable, like maybe Flint, MI but for the most part the whole water industry is just a bunch of bullshit marketing. Never had a tap that wasn't perfectly fine.
I did a test with my kids who were once filtered water believers, they couldn't identify tap versus filtered. Shortly after they stopped. I've drank tap in 70% of countries in the EU and all over most of the US. Can't say I've ever tasted a difference.
You can't taste a noticeable difference when it's done blindly. When you know what you're tasting suddenly the results are completely different. I always chuckle at those fat women going for their lunch walks with that bottle of water in their hand that believe this "stay hydrated" bullshit.
http://abcnews.go.com/GMA/story?id=126984&page=1 - NYC tap won hands down
http://www.bu.edu/today/2011/bottled-vs-tap-which-tastes-better/ - vast majority of testers couldn't tell a difference
https://ww2.amstat.org/publications/jse/v18n1/lunsford.pdf - same results