Iowa Code § 462A.15: Water skis and surfboards.

1. No person shall operate a vessel on any waters of this state under the jurisdiction of the commission for towing a person or persons on water skis, surfboard, or similar device unless there is in such vessel a responsible person, in addition to the operator, in a position to observe the progress of the person or persons being towed.

2. This section does not apply to a performer engaged in a professional exhibition or a person or persons engaged in a professional exhibition or a person or persons engaged in an activity authorized under section 462A.16.