What is the effect of stormwater runoff on local waterways?

Stormwater runoff plays a significant role in influencing the health of local waterways. When rain falls on urban areas, that water collects various substances from roads, rooftops, and other surfaces as it flows over them. This includes oil, heavy metals, fertilizers, pesticides, and sediments. As stormwater makes its way into streams, rivers, and lakes, it can introduce these harmful pollutants, which can severely degrade water quality.

Pollutants can disrupt aquatic ecosystems, harming fish and other wildlife, and can pose risks to human health and safety if they contaminate drinking water supplies. Thus, the impact of stormwater runoff is largely negative due to the introduction of these harmful substances, making it crucial to implement effective stormwater management practices to mitigate its effects on local waters.