The Electrical Water Pageant usually follows this schedule:
Disney's Polynesian Resort - 9:00 pm
Disney's Grand Floridian Resort & Spa - 9:15 pm
Disney's Wilderness Lodge - 9:35 pm
Disney's Fort Wilderness Resort & Campground - 9:45 pm
Disney's Contemporary Resort - 10:05 pm
Magic Kingdom park - 10:20 pm (only during extended Magic Kingdom Park hours)
(You may want to check with the resort just in case the schedule changes or if its canceled due to the weather that day)