PHTA is the world’s oldest and largest association representing the swimming pool, spa, and hot tub industry. Our membership is comprised of manufacturers, manufacturers’ agents, builders, designers, distributors, suppliers, installers, retailers, and service technicians. Since 1983, PHTA has been the leading industry organization recognized by the American National Standards Institute as a Standards Development Organization to promote and develop national consensus standards for swimming pools, spas, and hot tubs.