In short:
since 2013 EU has 10 ug/L limit. since 2020 a goal was set for 5 ug/L to be achieved until 2036.
EPA current limit is 15 ug/L. Yes, they have set a 0 goal, but with apparently no timeline, so until than there will still be many areas with 15 ug/L. Bidens proposal would probably set this 0 goal into a 10 year timeframe, making it much better than the EU goal.