Blaney competed at the NCAA Division III Swimming & Diving Championships for the third time in 2015. He earned honorable mention All-American accolades in the 200 free, finishing ninth overall in the event with a program-record time. He also competed in the 500 free (27th) and the 100 free (39th). Blaney was First Team All-Conference in the 200 and 500 free after winning conference and state titles in both events. For his efforts, he was named both the Empire 8 Swimmer of the Year and the Co-Male Swimmer of the Meet at the conference championships. He led the team in points this season with 578.8.
