Which of the following best describes the aim of the Clean Water Act?

• A. To improve air quality
• B. To regulate groundwater withdrawals
• C. To set maximum permissible discharges of pollutants into waterways
• D. To regulate noise pollution

Answer: (C)

This item tests how the Clean Water Act controls pollution in waterways. The central idea is to limit how much pollution can be released into rivers, lakes, and streams by setting enforceable limits and requiring permits for discharges. The main mechanism is permits that specify maximum allowable pollutant amounts, known as effluent limits, for discharges from facilities into navigable waters. This permit system, along with monitoring and enforcement, aims to protect water quality and aquatic life over time.

Air quality, groundwater withdrawals, and noise pollution are governed by different laws and regulations, not the Clean Water Act. Improving air quality falls under the Clean Air Act; groundwater withdrawals are addressed by other groundwater and drinking water protections; noise pollution is typically managed by other regulations and local controls.