* Disney's Blizzard Beach: Opened in 1995
* Disney's Typhoon Lagoon: Opened in 1989
* Disney's Aquatica: Opened in 2012 (located at SeaWorld Orlando, but owned by SeaWorld Parks & Entertainment)
* Disney's Paradise Pier: Opened in 1996 (formerly had a waterpark area called "Paradise Pier Surfside" but it was closed in 2015)
Do you have a specific waterpark in mind? If you tell me which one, I can give you the exact year it opened!