Video assistant review, commonly known as VAR, was introduced to Olympic water polo at the 2020 Tokyo Games. The technology serves to help referees determine if a ball completely crosses the goal line since the cameras are situated exactly on the goal line. VAR will be used again at the Paris Games. 

Other technology used in Olympic water polo include the visual system that lights the common meter markers and goal lines to help players and spectators know the areas of the pool. Swim-off flotation rings are also used to place the ball evenly in the center of the pool instead of referees throwing the ball in to start each quarter. Additionally, underwater cameras are put in place to show what action is occurring below the surface to help viewers receive a better understanding of the game. 

Balls used in Olympic water polo float, allowing easier ball movement for players. It is made of waterproof material and contains certain textures to allow players to have a better grip on the ball. The ball used in water polo weighs between 400-450g (less than a pound) and measures about 0.68m to 0.71m across (26 to 28 inches) for men and 0.65m to 0.67m (25 to 26 inches) across for women. 

Caps in Olympic water polo are used to distinguish the various players on a team as well as to protect the athletes. The colored headgear contains individual numbers and ear protectors. 

The dimensions of the pool are required to be 30m by 20m (98.4 ft by 65.6 ft) with a depth of at least 1.8m (about 6 ft), but preferably 2m (6.5 ft). The water temperature is regulated and should be between 25 and 27 degrees Celsius (77 and 80.6 degrees Fahrenheit). 

Lane ropes and buoys: Used to distinguish the area of play and indicate distances from the goals. 

Goal: Each goal post is 3m wide by 90 cm tall (approx. 10ft by 3ft).