[seanmcdirmid]

They are based on information from the CDC. If you have better maps that you use for your travels, please link. Not that I travel at all in eastern/south Eastern Europe, so “don’t drink the water unless in developed country” works well enough for me (I mostly travel in Asia outside the USA).

[Const-me]

Here's what CDC.gov says about Croatia:

> Food and water standards in Croatia are similar to those in the United States. Most travelers do not need to take special food or water precautions beyond what they normally do at home.

So no, it's not based on CDC.

Both maps are just wrong. The reality is, 70% of global population has drinkable tap water, here's the data: https://data.unicef.org/topic/water-and-sanitation/drinking-...