Drainage of storm water, rainwater, or groundwater should not be directed into which of the following?

Drainage of storm water, rainwater, or groundwater should not be directed into sewers because sewers are typically designed to handle wastewater from household and industrial sources, rather than large volumes of storm water or groundwater. When storm water enters the sewer system, it can overwhelm the system, leading to overflows, pollution, and potential backflow problems which can contaminate drinking water supplies and create environmental hazards. Mixed systems, where both sewage and storm water flow into the same pipes, are particularly prone to issues during heavy rain, which can lead to sewage overflow into streets and waterways, causing significant public health and environmental risks. For these reasons, proper drainage systems for storm water should be separate and managed through designated storm water management systems or drainage solutions.