Which measure best targets improvements to wastewater treatment as a means to reduce water pollution?

• A. Upgraded sewage treatment plants
• B. Reducing use of chemicals on agricultural lands
• C. Vegetation buffer zones
• D. Increased government enforcement

Answer: (A)

Targeting wastewater treatment directly reduces the pollutants that are released into water bodies. Upgrading sewage treatment plants brings in newer processes that remove more content from wastewater—organic matter, nutrients such as nitrogen and phosphorus, pathogens, and even some micro-pollutants. By improving the treatment before effluent enters rivers, lakes, or coastal waters, the overall water quality improves and aquatic ecosystems are better protected.

Other options address pollution sources or enforcement rather than direct treatment. Reducing chemical use on agricultural lands helps lessen runoff from farms, which is important but deals with nonpoint source pollution rather than the treatment of wastewater itself. Vegetation buffer zones filter some pollutants from runoff, but they don’t upgrade how wastewater is cleaned. Increased government enforcement can improve compliance, yet it doesn’t by itself enhance the treatment processes. So, upgrading sewage treatment plants best targets improvements to wastewater treatment as a means to reduce water pollution.