The quality of US surface water relies largely on which document?

• A. Clean Water Act of 1974
• B. Clean Air Act
• C. Safe Drinking Water Act
• D. National Environmental Policy Act

Answer: (A)

The main idea is that protecting surface water quality is governed by a national framework that sets limits on pollutants and requires states to establish water quality standards. The Clean Water Act does this by creating the regulatory structure for discharges into navigable waters through permit requirements, establishing water quality criteria, and directing states to identify and restore impaired waters. That combination directly targets the health of rivers, lakes, and streams, making it the primary instrument for ensuring surface water is protected and clean. The other acts focus on different areas: the Clean Air Act addresses air pollutants, the Safe Drinking Water Act deals with drinking water quality for public systems, and the National Environmental Policy Act sets procedural requirements for federal actions rather than pollutant controls.