What is the primary source of water pollution in agricultural areas?

The primary source of water pollution in agricultural areas is largely attributed to fertilizers and pesticides. In agricultural practices, these chemicals are commonly used to enhance crop production and control pests. When it rains or when irrigation occurs, these substances can run off fields and into nearby water bodies. This runoff can lead to nutrient pollution, particularly from nitrogen and phosphorus found in fertilizers, which can cause excessive growth of algae, leading to eutrophication. This process depletes oxygen in the water and harms aquatic life. Additionally, pesticides can contaminate waterways, posing risks to aquatic ecosystems and potentially affecting human health. While sewage, heavy metals, and industrial runoff can contribute to water pollution, their impact is often more localized or associated with specific types of industry rather than being a widespread issue in agricultural settings.