The Coming Water Wars: Chart

If there are future water wars, the countries with the "best" water (see below) better start buying weapons to defend themselves. It so happens that the countries with the best water are also some of the most peaceful countries on Earth... My question: Why does Belgium have the "worst" water?

Best Water:

1) Finland
2) Canada
3) New Zealand
4) United Kingdom
5) Japan

Worst Water:
1) Belgium
2) Morocco
3) India
4) Jordan
5) Sudan

http://www.princeton.edu/~ina/infographics/water.html