Cincinnati’s Combined Sewer System (CSS) carries stormwater runoff and sanitary sewage in the same pipes, often leading to overflows and untreated sewage entering water bodies during heavy rainfall. To address this, the city has been implementing Combined Sewer Overflow (CSO) control projects aimed at reducing these overflows and improving water quality. 

To further mitigate stormwater runoff, Cincinnati promotes green infrastructure initiatives such as green roofs, rain gardens, and permeable pavements, which help absorb and filter stormwater, reducing the volume entering the sewer system. Additionally, the construction of retention and detention basins provides temporary storage for stormwater during heavy rainfall, preventing immediate runoff and thereby reducing flooding and pollution. Public education and participation are also crucial, with efforts to inform residents and businesses about stormwater management practices like reducing impervious surfaces and proper disposal of chemicals. 

Cincinnati complies with state and federal environmental regulations, developing stormwater management plans and ensuring new developments meet runoff reduction standards. Regular monitoring and maintenance of stormwater systems, including cleaning drains, inspecting ponds, and repairing infrastructure, ensure their effectiveness. The city’s comprehensive stormwater management strategies rely on collaboration between city departments, environmental agencies, and stakeholders, supported by funding through grants, partnerships, and stormwater utility fees.