What is the main difference between a sanitary sewer and a storm sewer?

Sanitary sewers are specifically designed to transport wastewater, which includes sewage and other waste generated from residential, commercial, and industrial sources. This wastewater is typically treated at a sewage treatment facility to remove contaminants before it is released into the environment.

On the other hand, storm sewers are intended to manage rainwater or stormwater runoff. These systems are designed to quickly drain excess water from precipitation events, helping to prevent flooding and erosion. Stormwater generally carries pollutants like debris, sediment, and chemicals from surfaces such as roads and parking lots, but it does not include human waste or sewage.

The distinction is crucial because it underscores the differing purposes and treatment processes associated with each system. Understanding this difference is important for ensuring proper waste management, environmental protection, and compliance with regulations governing wastewater and stormwater management.