The Water Quality Association (WQA) is a not-for-profit association for the residential commercial, and industrial water trea ... tment industry. WQA represents more than 2,500 member companies around the globe. Our membership is comprised of equipment manufacturers, suppliers, dealers and distributors of water quality improvement products and services. WQA proudly serves as an educator of water treatment professionals, certifier of water treatment products, public information resource and voice of the water quality improvement industry. read more