Prerequisites: Minimum age: 15 years; Swim 300 yards continuously; Tread water for 2 minutes using only the legs; Complete a timed event within 1 minute, 40 seconds by starting in the water, swimming 20 yards, surface dive to a depth of 7 to 10 feet to retrieve a 10-pound object, return to the surface and swim 20 yards on the back to return to the starting point, exit the water without using steps or a ladder. US Labor Laws require that you be 15 years or older to work at a swimming pool, water park, lake, and 16 years or older at beaches.