Here's the info:
The Electrical Water Pageant is a nightly display for the Magic Kingdom Area Resorts.
The pageant consists of two strings of seven barges, each carrying a 25-foot-tall screen of lights featuring King Neptune and creatures from under the sea in an aquatic parade set to Disney music._
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Flags and Stars -- The pageant concludes with an inspirational salute to America, with_ Flags and Stars set to a patriotic musical score.
It was originally presented for the dedication of the Polynesian Luau on October 26, 1971._
Although the pageant generally follows the schedule below, check with the Guest Services Desk at your Magic Kingdom Resort for times during your stay.
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Polynesian Resort -- 9:00pm
Grand Floridian -- 9:15pm
Wilderness Lodge -- 9:35pm
Fort Wilderness -- 9:45pm
Contemporary Resort -- 10:05pm
Magic Kingdom -- 10:20pm (only during extended MK park
hours)
Note that when the Magic Kingdom Fireworks are scheduled for 9:00pm, the Electrical Water Pageant runs about 7-20 minutes later.
You can also call cro to confirm