Read this US policy on clean water.The Clean Water Act (CWA) establishes the basic structure for regulating discharges of pollutants into the waters of the United States and regulating quality standards for surface water.–Summary of the Clean Water Act, Environmental Protection Agency
Answer
A
by monitoring a toxic spill that affects a drinking water supply
B
by providing pamphlets related to the quality of drinking water
C
by carrying out research about the effects of large discharges
D
by controlling the amount of water people use in their homes