I think that this is talking about tap water in urban areas of developed countries where tap water codes would be held.
I heard that in some places tap water is safe to drink, but in others it isn't.
The latter quote is more accurate, even in the developed, urban parts of the US.
When I lived in Miami, after every hurricane, there was a warning on the news not to drink tap water, due to contamination. Howso? Power outages combined with flooding (either rain or storm surge) can cause untreated water to backwash into the supply lines. Hence, during hurricane season, bottled water was the safer water source.
That said, if you water supply doesn't have that kind of contamination problem, the (huge) graphic has a point.