You are probably looking at the wrong map. There is currently a shortage of water for small wells in parts of Sweden. On the other hand there is more water than usual for municipal water in most of Sweden. Plus some places like Stockholm use lake water which is always plentiful. This is bad news for people with their own wells but go for people who pay for their water.
I don't doubt you're right about the lake water. However, this morning they again warned about low groundwater levels on the local Stockholm news and that we might see an irrigation ban (as has become common practice last few years). They also urged people to use less water so it definitely seems to be a problem in Stockholm as well, even with the lake water.
