I travel with an immune-suppressed individual and have been told that the only way we can go is if we filter our water.  (We always have anyway, or boiled it.)

For the two us we just take the Katydyn pump filter and pump what we need.  We go to the BW, but it would be the same situation if we went to parks in Canada.  For us filtering is not an option.  Perhaps for healthy people with intact immune systems it isn't quite as important.