NSF61 certification, it’s about “Drink Water System Components-Health Effects", is a standard related to drinking water health and environmental protection. It was formulated and promulgated by the NSF of the United States, which is a non-profit organization dedicated to safety, health and environmental protection. The drafting organizations of this standard include: NSF International (National Safety and Health Foundation), American Water Works Association Research Foundation (American Water Works Research Foundation), Association of State Drinking Water Administrators (National Drinking Water Administrators Association), The American Water Works Association. The basic purpose of this standard preparation can quote the description of the original text "[1] Purpose: This standard establishes minimum health and impurities that are indirectly imparted to drinking water from products, components or materials used in drinking water system. This standard does not establish performance, tastes and odors or microbial growth supports for drinking water system products, components or materials.” That is, the purpose of this standard is to maximize the control of non-healthy and non-pure substances produced by water-wading products, accessories or materials in drinking water. Adverse effects caused by contact with drinking water. Any product that comes into contact with water, such as pipes, fittings, coatings, valves, gaskets, water meters, pumps, faucets, etc.

The standard is NSF/ANSI 61, collectively referred to as non-toxic test, for all products in contact with drinking water in North America. For this type of product, the standard stipulates that heavy metals and organic carcinogens cannot exceed the limit.

NSF372 certification, the decree was approved by the California government on September 20, 2006, to adjust the original lead-free standards for drinking water supply systems and related products. The decree was officially implemented on January 1, 2010 and has now become a mandatory certification.

The definition of lead-free: pipe products and accessories, add the product of the lead content of each water-passing component and the percentage of the water-passing area to the total water-passing area. The calculated value must not be greater than 0.25. That is, ≤0.25%.