What effect can fertilizers and sewage have on rivers and lakes?

Humans prepare fertilizers, which are chemicals, to give the soil artificial fertility, but this doesn't work because

Fertilizers are easily absorbed by the soil's water particles when they are spread across fields. Eventually, this subterranean water is deposited in water bodies, causing a chemical increase that is harmful to both the aquatic ecosystem and us humans who drink the water.

The same is true of sewage, which contaminates fresh water supplies and renders them unfit for human consumption.

The causes of the environmental imbalance in nature and its disastrous effects on other living things are all these activities combined.

Fertilizers and sewage can have detrimental effects on rivers and lakes. Excessive use of fertilizers can lead to nutrient runoff into water bodies, causing eutrophication, which is the overgrowth of algae and aquatic plants. This can deplete oxygen levels in the water, leading to fish kills and the degradation of aquatic habitats. Sewage can introduce harmful bacteria, pathogens, and chemicals into rivers and lakes, contaminating the water and posing risks to human health and aquatic life. Additionally, sewage can contribute to nutrient pollution, further exacerbating eutrophication and impairing water quality. Overall, the presence of fertilizers and sewage in rivers and lakes can lead to ecological imbalances, biodiversity loss, and compromised water resources for both humans and wildlife.