not sure if this should go in the sports/activities thread, but anyway....
for anyone planning on swimming in Switzerland, here
is an interesting add-on to an EU report addressing bathing water quality in Switzerland.
apparently, the quality is good, except towards the French side, there are a couple of red spots. This (kind of) follows larger trends in Europe where the quality of French bathing water does not meet mandatory values.
the full report on all EU countries can be downloaded as a PDF from this page
happy reading & swimming