This is the best summary I could come up with:

Contamination levels in the first eight days of June, after persistent heavy rain in Paris, showed bacteria such as E. coli and enterococci beyond limits judged safe for athletes.

The report was published by monitoring group Eau de Paris one day after a senior International Olympic Committee executive said there were “no reasons to doubt” races will go ahead as scheduled in a historic downtown stretch of the Seine near the Eiffel Tower.

Marathon swimming races over 10 kilometers (6.2 miles) for women and men are scheduled on Aug. 8 and 9, respectively, in waters that were historically polluted before a $1.5 billion investment ahead of the Olympics

The safety of the Seine water for the Olympics has been in doubt since some test events scheduled last August were cancelled, also after unseasonal heavy rains.

Rainwater infiltrates the sewer system, and to prevent street flooding, the excess water, carrying fecal bacteria, is diverted into the Seine.

Water quality of rivers in major cities can be impacted by many things, from runoff to dumping of chemicals, sometimes illegally, and boat traffic.

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