[1] Portsmouth Northsea SC uses four pools across the city, with Mountbatten Leisure Centre as its main base,[1][3] and offers a Learn to Swim Programme, annual Club Championships, Open Meet competitions, and an Easter Swim Festival.

[1][4] A 1933 article in the Portsmouth Evening News, however, traces the club's inception as far back as the summer of 1911, when the Stamshaw Swimming Pond first opened.

[5] In 1919, Superintendent George Byng called a meeting of his supporters to form a swimming club and resume aquatic activities, which had been on hiatus during World War I.

[5] The Northsea Swimming Club subsequently formed a water polo team, which won a local competition in 1926.

[4][7] Over the years, Portsmouth Northsea SC has trained many British swimmers that have reached international competitions such as the Olympic and Paralympic Games, including: