How is stormwater different from sanitary sewage?

Stormwater is fundamentally different from sanitary sewage in that it arises from natural weather events, specifically runoff from precipitation, such as rain or melting snow. This water flows over surfaces like streets, lawns, and buildings, gathering various pollutants along the way, including sediments, chemicals, or debris, but it does not contain human waste or wastewater byproducts.

Sanitary sewage, on the other hand, is specifically the wastewater generated from household activities, including toilet use, bathing, washing, and cooking. This type of sewage contains human waste and a variety of pathogens, making its treatment necessary to protect public health and the environment.

Understanding this distinction is crucial in sewage treatment work, as it informs how each type of water is managed. Sanitary sewage typically requires a more extensive treatment process to remove contaminants, while stormwater management focuses on controlling runoff and reducing pollution entering natural water systems. This difference emphasizes the unique handling and treatment strategies required for each type of water to ensure effective environmental protection and public safety.