Though swimming is not strictly a necessity to learn or start water skiing, it is always advisable to have learned the art of staying afloat on the water. One can always wear lifejackets to stay afloat in case of losing balance.
However, there are other dangers also. Skiing on shark-infested waters is always dangerous. When the activity is performed in rivers and lakes, the danger or attack from marine creatures is limited. But the same is not the case when skiing on the seas.
This peril was caught on camera in one of the Jaws series. The movie has kept a generation of people away from waters, and quite possibly from the sport of water skiing. Another danger is hidden or submerged rocks.
These could ambush skiers and throw them of balance. However, this danger is minimal as most skiing is done over waters that has been tested and is familiar for the skiers. But when skiing over waters that is not familiar to the skier, or is not chartered, then the danger from rocks is real.
The skier always faces the danger of losing balance and crashing in the water. This could affect even experienced skiers. While skiing at high speeds, the skier could lose balance and fall. The impact of the human body on water while at high speeds can be extremely fatal for the skier.
The best way to avoid such problems is to ski with experts or in groups, so that there are other people to come to your rescue when something untoward happens. It is imperative that skiers always take safety measures before embarking on the activity.