The Clean Water Act of 1972, amending the Federal Water Pollution Control Act of 1948, gave teeth to earlier legislation aimed at preventing or reducing water pollution and laid the groundwork for future efforts to preserve the nation's wetlands. However, in 2001, a Supreme Court decision [see Document152] limited the reach of section 404 and put a roadblock in the way of effective wetlands preservation.
-The Environmental Debate: A Documentary History

"The Safe Drinking Water Act (SDWA) was passed by Congress in 1974, with amendments added in 1986 and 1996, to protect our drinking water. Under the SDWA, EPA sets the standards for drinking water quality and monitors states, local authorities, and water suppliers who enforce those standards."
-Center for Disease Control and Prevention

"On October 23, 2018, America’s Water Infrastructure Act (AWIA) was signed into law, amending
numerous provisions of the Safe Drinking Water Act (SDWA). AWIA also amended the Emergency
Planning and Community Right-to-Know Act (EPCRA). The revisions to EPCRA require that community water systems (1) receive prompt notification of any reportable release of an EPCRA extremely hazardous substance (EHS) or a Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) hazardous substance (HS) that potentially affects their source water, and (2) have access to EPCRA Tier II information (i.e., hazardous chemical inventory data). These requirements went into effect immediately upon signing the law."
-Environmental Protection Agency