IS 4985:2021 certification is mandatory for manufacturers of HDPE pipes used in water supply systems, as per the Bureau of Indian Standards (BIS) guidelines. The standard outlines quality benchmarks for dimensions, physical properties, material specifications, and testing procedures to ensure safe and efficient performance in real-world applications. https://www.agileregulatory.com/blogs/bis-certification-for-pvc-pipes-is-4985-2013