All of eastern Europe has undrinkable tap.

True, Poland is central Europe.

slavs are not white.

Also true, Slavs are indigenous people of colour, possessing native ancestral bond with the land. That's why we cannot accept migrants form outside of Europe, they disrupt our natural harmony and cannot coexist with our native ways of knowing.

Tbh I have no idea where the graph is from or what criterion it uses, but Hungary has perfectly fine tap water. I'm sure there are areas like Flint in the US, but I doubt that affects even 1% of the population, it's not even a public discussion topic and it has been the same since the generations, so it can't even be that it's because it's slightly outdated.

Same with Romania, Bulgaria and the other ex-yugo states. Athought the first 2 have problems with public utilities existing in remote places, Romania is a good example.

When I was in Romania everyone drank tap water with no issue