Yeah, the Seine is everything but clean, but keep in mind that regulation in Europe is pretty strict. The talk about Seine instantly reminded me of the olympics in Rio.

In July, the AP reported that its first round of tests showed viruses causing stomach and respiratory illnesses and more rarely heart and brain inflammation at levels up to 1.7 million times what would be considered highly alarming in the U.S. or Europe.

https://apnews.com/c96284cf2724488b8194e99b9ba894d7/new-ap-test-rios-olympic-water-consistently-contaminated