Utah law states that these dangerous operating practices are illegal:

Negligent Operation is willfully or negligently operating a vessel or manipulating water-skis or other devices in a manner that causes danger to the life, limb, or property of any person. This includes:

• Not paying attention to the operation of the vessel.
• Failing to keep a proper lookout.
• Failing to observe the navigation rules.
• Failing to display the proper navigation lights when boating at night.
• Operating in a manner or at a speed that exceeds safe and reasonable limits under the existing circumstances.
• Operating at a rate of speed that creates a wake that causes damage or injury.
• Operating such that your vessel collides with another vessel or object.
• Attempting to spray others with the wake of your vessel.