[benjiro]

Probably a issue with PFAS contamination. Stuff was used in firefighting water, and has contaminated just about every airport and the surrounding area's groundwater, all over the world. So while microbiologically safe, it has PFAS issues.

[Scoundreller]

Either that or hydrocarbons from leaks over several decades or deicing fluid easily infiltrating their wells, or all!

Or they don’t test it and therefore can’t certify it but I did take a swig and immediately spat it out.