There are four authoritative certification departments in the world, or four kinds.
U.S. Food and Drug Administration.
Water Quality Association (WQA) is the international trade association representing thehousehold, commercial, and industrial water quality improvement industry.
Founded in 1944, our mission is to protect and improve global human health. Manufacturers, regulators and consumers look to us to develop public health standards and certifications that help protect food, water, consumer products and the environment. As an independent, accredited organization, we test, audit and certify products and systems as well as provide education and risk management. It’s not US government, belong to World Health Organization.
4.Local country authoritative certification department. Such as MOH in China and WRAS in UK.
MOH means Ministry of Health, government of local country.