Six Flags Hurricane Harbor Concord, Water park in Concord, United States

Six Flags Hurricane Harbor Concord is a seasonal water park in Concord, California, owned by EPR Properties and operated by Six Flags. It opened in 1995 as Waterworld USA Concord. Rides include Breaker Beach wave pool, the Kaanapali Kooler lazy river, the Typhoon Slide Complex of four two-person tube slides, the ProSlide Tornado 60 and the 2015 Break Point Plunge capsule slides. Splashwater Island and Caribbean Cove, both opened in 2018, serve younger children.

Opened in 1995 as Waterworld USA Concord, the park was bought by Premier Parks on October 25, 1996, from FRE, Inc. After Premier Parks acquired the Six Flags chain in 1998, the park kept its name until February 2005, when it became Six Flags Waterworld Concord. PARC Management bought it on January 11, 2007, for $312 million and renamed it Waterworld California; Six Flags took over operations again in 2017 and renamed it Six Flags Hurricane Harbor Concord on February 22, 2018.

The park's name changed with each owner: Waterworld USA Concord from 1995, Six Flags Waterworld Concord in 2005, Waterworld California in 2007, and Six Flags Hurricane Harbor Concord in 2018. The Banzai Pipeline slide collapsed in 1997 during a Napa High School graduation outing, killing 18-year-old Quimby Ghilotti and injuring 32; the park, the slide's builder and the school district paid $4 million in settlements.

The park operates seasonally and shut entirely for 2020, the first year it had not opened since 1995; it reopened on 22 May 2021 for members, with the general public admitted a week later. Plan a visit around the summer operating season rather than year-round opening.

The Banzai Pipeline slide collapsed on June 2, 1997, when seniors from Napa High School tried to set a record by entering it in a tightly packed group. A 20-foot section gave way and students fell more than 30 feet onto concrete; 18-year-old Quimby Ghilotti died and 32 were injured. The fiberglass slide had been loaded with three times its design weight.