The purpose of catch basin inserts is to prevent what?

Catch basin inserts are specifically designed to prevent groundwater contamination by filtering pollutants from stormwater before it can enter the drainage system. These inserts capture various harmful substances, such as oils, heavy metals, and sediments, that may be present in stormwater runoff. By doing so, they play a critical role in protecting groundwater resources, which are essential for drinking water and ecological systems.

While options like excess water flow, air pollution, and water stagnation are related concerns in stormwater management, the primary function of catch basin inserts is focused on the prevention of contaminants from reaching groundwater supplies. This targeted approach helps ensure that the stormwater runoff is treated effectively to minimize environmental impact.