Why are there warnings to avoid letting yard fertilizers runoff after watering?

Question

As title states, what damage does fertilizer do to the sewage or water supply? Was adding fertilizer to my yard today and noticed the earnings on the bag

In: 0

Answer 1

Fertilizers that enter bodies of water can cause algal blooms. Huge amounts of algae grow in the water and release substances that are toxic to people and to aquatic life. The algae also dies and rots, which consumes oxygen. These anoxic conditions are deadly to animals with gills. In the worst cases, these blooms create dead zones, where virtually nothing can survive.