Chios plays almost constantly in A1 Ethniki (first division of Greek Water Polo championship) and it has won a Greek Cup.

During 40s decade the club declined due to World War.

The club's premises were used by German army as fort.

Since 1966, Water Polo team plays constantly in A1 Ethniki (first division).

[2] It has won a Cup and has finished in the first places of the championship many times.