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The sewer system can't retain enough when it rains heavily.
Similarly, the Thames is the overflow for the combined sewer system - when it rains raw sewage is discharged into the river. They are currently building the "super sewers" to increase capacity. Opponents say it can and should be dealt with instead by removing much more rainwater from the system, reducing impermeable surfaces, increasing ground drainage, green roofs and rainwater harvesting.
hoefla
Is the water quality of the Thames so good you can swim in it everywhere?
Notwithstanding other dangers, of course.
If you swim in the spree inside Berlin you most likely catch something nasty. The sewer system can't retain enough when it rains heavily.
Of course also to do with it flowing so slow.
In summer I really miss Bern and the river Are.