Kalahari Resorts and Conventions founded National Waterpark Day on July 28, 2017, to celebrate the unique attractions waterparks offer especially during the height of summer. After opening their first waterpark in July 2000 in the Wisconsin Dells, they expanded to other areas of the country. Visit the Pocono Mountains in Pennsylvania or Sandusky, Ohio for more waterpark fun. In March 2017, the resort opened phase two of its waterpark in the Pocono Mountains. The expansion also dethroned the Sandusky location as America’s Largest Indoor Waterpark. The resort was awarded #1 World’s Coolest Indoor Waterpark by Conde Nast Traveler in 2014.
The Registrar at National Day Calendar® declared the observance to be celebrated on July 28th, annually.