NPDES regulations pertain to discharges into which?

• A. Air
• B. Water and stormwater
• C. Soil
• D. Noise

Answer: (B)

NPDES regulations govern discharges into waters of the United States, including stormwater runoff. This program, created under the Clean Water Act, uses permits to control point-source discharges to surface waters, setting effluent limits and requiring monitoring and reporting. That focus on protecting water quality is why the correct choice is water and stormwater. It doesn’t regulate air emissions (that’s under the Clean Air Act), soil contamination, or noise, which are handled by other laws and programs. For example, an industrial facility discharging wastewater to a river or a city managing stormwater runoff would be subject to NPDES permitting to protect water quality.