Which term describes pesticides that move with rainfall or irrigation water?

The term that describes pesticides that move with rainfall or irrigation water is non-point source pollution. This classification refers to pollutants that are not discharged from a single, identifiable source but rather come from diffuse sources. When rain or irrigation occurs, these pesticides can wash off from agricultural lands, residential areas, and other surfaces, leading to contamination of waterways and soil. Non-point source pollution is significant because it can be challenging to regulate and control due to its widespread and varied origins.

In contrast, point source pollution refers to contaminants that can be traced back to a specific, identifiable source, such as a factory or wastewater treatment plant. Chronic pollution typically denotes long-term exposure to pollutants, while hazardous waste refers to materials that are dangerous or potentially harmful and require special handling. Understanding these distinctions is crucial for effective pesticide management and environmental protection.