Chowaniec began his swimming career at Wodnik Siemianowice Śląskie[1] and, since 2023, has been competing for AZS-AWF Katowice.
In 2019, he won a gold medal in the 50-meter freestyle at the Summer European Youth Olympic Festival.[2] In 2021, he became the European Junior Vice-Champion in the 200-meter freestyle.[3] He was a candidate for the Tokyo 2020 Olympics, but was incorrectly registered and not allowed to compete.[4] In 2023, he won a gold medal in the 4 × 100-meter freestyle relay and a bronze medal in the 100-meter freestyle at the Summer Universiade.[5]
He is the Polish senior record holder in the mixed 4 × 200-meter freestyle relay (7:41.29 - 16 August 2022 at the European Championships in Rome).[6]
At the Polish Senior Championships, he won a bronze medal in the 100-meter butterfly in 2022,[7] and in 2023, he won a gold medal in the 4 × 100-meter relay and a silver medal in the 100-meter freestyle.[8]
