Interesting. When I worked in Warsaw in 2004, I mentioned to my local colleagues that I find the the tap water strange. It is a bit yellow. They warned me not to drink it. Apparently everyone were drinking bottled drinking water purchased in the supermarkets.<br>It's nice that they fixed this problem since then.,(reply>), Anecdotal evidence of nothing... Tap water in Warsaw was perfect since I can remember. You can get yellow tap water everywhere due to pipe issues,(reply>), Old pipes are to blame. And after fixes services don't flush them only allow consumers to consume silt.