What is the main concern when dealing with stormwater runoff?

The main concern when dealing with stormwater runoff is its potential to carry pollutants. Stormwater runoff occurs when precipitation flows over surfaces and collects various contaminants such as oils, heavy metals, sediments, pathogens, and nutrients. This water can then enter surface waters like rivers, lakes, and streams, leading to significant environmental and health issues.

Pollutants in stormwater can harm aquatic ecosystems, reduce water quality, and pose risks to human health when they contaminate drinking water sources or recreational waters. Effective management of stormwater is essential to mitigate these risks, employing strategies such as infiltration, retention ponds, and vegetated swales to filter and reduce the pollutant load before it reaches water bodies.

While factors such as soil erosion, the impact on wildlife, and beneficial nutrients are relevant in the context of stormwater and its overall environmental effects, the primary focus remains on the pollutants because of their direct and immediate consequences on water quality and ecosystem health.