The Mystic Krewe of Aquarius was organized in March 1985. It is the second oldest Mardi Gras social organization in Galveston, since the 1984 revival of the Galveston Mardi Gras celebration.

The Krewe sponsors the kick-off Saturday afternoon "Seawall Boulevard" parade for the 10-day Mardi Gras season in Galveston. This parade is the longest and largest parade of Galveston's Mardi Gras season. The Mystic Krewe of Aquarius also sponsors the Fat Tuesday evening parade through the historic Strand District of Galveston. The Krewe invites all Galveston Krewes, as well as area marching bands, to participate in this parade.

Mystic Krewe of Aquarius members participate in activities througout the year, including social events, fund-raising functions, parades, charity and media events, throughout Galveston and the Houston Metropolitan area.