Plumbing codes and licensing in USA
In the United States, plumbing codes and licensing are generally controlled by state and local governments. At the national level, the Environmental Protection Agency has set guidelines about what constitutes lead-free plumbing fittings and pipes, in order to comply with the Safe Drinking Water Act.
Some widely used Standards in the United States are:
ASME A112.6.3 – Floor and Trench Drains
ASME A112.6.4 – Roof, Deck, and Balcony Drains
ASME A112.18.1/CSA B125.1 – Plumbing Supply Fittings
ASME A112.19.1/CSA B45.2 – Enameled Cast Iron and Enameled Steel Plumbing Fixtures
ASME A112.19.2/CSA B45.1 – Ceramic Plumbing Fixtures