The Town of Newmarket, NH Recreation Department’s Camp Wanna Iguana Summer Camp program founded National Water Balloon Day in 2019 to celebrate their time-honored tradition of birthday water balloons, plus all the summertime fun water balloons have brought campers throughout the years and will bring to future generations.
In 2019, the Registrar at National Day Calendar proclaimed National Water Balloon Day to be observed the first Friday in August annually.