What is often a source of sediment pollution in stormwater?

Sediment pollution in stormwater is primarily caused by soil erosion. When it rains, water runoff can dislodge soil particles from land surfaces, particularly in areas where vegetation has been removed or disturbed. This eroded soil is then washed into nearby streams, rivers, and lakes, contributing to sediment pollution. The presence of excess sediment can have harmful effects on aquatic ecosystems, as it can cloud water, reduce light penetration, and smother aquatic habitats.

Factors like construction activities, deforestation, and agricultural practices are major contributors to soil erosion. When soil is exposed, it is much more susceptible to being carried away by stormwater runoff. Effective strategies for controlling sediment pollution often involve implementing erosion control measures, maintaining vegetative cover, and creating sediment traps or basins to manage runoff.

While other factors listed in the question, such as industrial effluent, automotive emissions, and household waste, can contribute to overall water pollution, they do not specifically relate to sediment pollution in stormwater the way that soil erosion does.