The Safe Drinking Water Act (SDWA) of 1974 which established primary and secondary quality standards for drinking water. See Safe Drinking Water Act (SDWA).
PUBLIC LAW 93-523 (PL 93-523)
Meaning of PUBLIC LAW 93-523 (PL 93-523) in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012