Which of the following is a drawback of stormwater runoff?

Stormwater runoff is a significant environmental concern because it can lead to water contamination. When rainwater flows over impervious surfaces like roads, parking lots, and rooftops, it picks up pollutants such as oils, heavy metals, chemicals, and debris. This contaminated runoff can enter storm drains, waterways, and eventually rivers and lakes, negatively impacting aquatic ecosystems and drinking water sources. The presence of these pollutants can harm wildlife, disrupt ecosystems, and pose health risks to humans who may come into contact with contaminated water.

In contrast, the other options present beneficial aspects of stormwater management or natural processes. Increased vegetation and enhanced groundwater recharge contribute positively to the environment by improving air quality, supporting biodiversity, and replenishing water supplies, while better irrigation practices can lead to more efficient use of water resources.