One of the things we love about living in Stockholm is the clean drinking water. We even have our free Stockholm Vatten calendar which tells us about how clean our drinking water is. Think of it, you can just drink what comes out of the faucet! I love it. But it's not usual for me, coming from DC, which let's face it has had it's problems. So for me, it's like living in a magical land.
However... "Clean" takes on a interesting aspect when you consider, what's in the sewage. (What a way to figure it out. Aren't you glad this isn't your job?)