Grzegorz Kołtan had the following podium finishes at the Flatwater World Championships: 1st 1977 K4 500 m (with Ryszard Oborski, Daniel Wełna, and Henryk Budzicz), 1st 1977 K4 1000 m (with Henryk Budzicz, Ryszard Oborski, and Daniel Wełna), 2nd 1979 K4 1000 m (with Ryszard Oborski, Grzegorz Śledziewski, and Daniel Wełna), 3rd 1974 K4 10000 m (with Kazimierz Górecki, Andrzej Matysiak, and Ryszard Oborski), 3rd 1978 K4 500 m (with Henryk Budzicz, Ryszard Oborski, and Daniel Wełna), 3rd 1979 K4 500 m (with Ryszard Oborski, Grzegorz Śledziewski, and Daniel Wełna).