As such, there is no national standard or policy regarding the minimum age of a child for swimming without any adult supervision. Most state laws require adult supervision for children only when there is No Lifeguard on Duty. The minimum age limit varies between the jurisdictions governing different counties, cities, or states. Some cities like Dayton, Ohio, allow children as young as 8 to be left unattended, whereas others like Broward County in Florida don’t allow children to be dropped off alone until they are at least 12 years old. New York state even goes up to 16. For residential pools, you can consult the child's swim instructor to ensure the child is a proficient swimmer. The American Red Cross Swimming and Water Safety Skills Chart is also a popular benchmark. To swim unsupervised, a child must perform all the tasks on Level 6.