When it comes to water polo, there is one major difference, regarding the ball, between the 2007-08 National Collegiate Athletic Association (NCAA) rules and the 2007-08 National Federation of State High School Associations (NFHS) rules.
Balls (Rule 3-5)
NCAA: At least five, game-quality balls must be available for all games.
NFHS: Five game-quality balls must be available for all championship games and are recommended for all games.
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The Fédération Internationale de Natation (FINA) regulates Olympic water polo for both men and women. They keep things simple, by specifying only the most basic characteristics for the ball - it must be round and waterproof, without straps or greasy coverings. With women able compete in the Olympics beginning in 2000, a slightly smaller ball was introduced into the games.
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The National Collegiate Athletic Association (NCAA) rules stipulate color, weight, size and number for the balls to be used in the sport of water polo. In addition, the ball must be waterproof and free of strappings and slippery coverings.