The Donaukanal water is too polluted, right?

Generally the water quality is the same as in the rest of the Danube.

No wastewaters go into the canal uncleared.

Of course, as with Danube and other waters in Vienna: after heavy rainfalls and in case of high water it is not recommended to swim, as the water quality drops in these situations. There could be overflowing wastewater Kanals and other dirt washed into our rivers. This condition is usually cleared after a few days. As swimming water quality is monitored on qualified swimming spots in Vienna, it is recommended to check the current water quality updates for swimming spots such as Neue Donau and Alte Donau and consider the information as directly comparable to the water quality of the Donaukanal.