What are combined sewer overflows?
Combined sewer overflows (CSOs) are discharges of untreated wastewater and stormwater released directly into marine waters, lakes, and rivers during periods of heavy rainfall. Although the sewage in CSOs is greatly diluted by stormwater, CSOs may potentially be harmful to public health and aquatic life because they may introduce toxins and pathogens into these water bodies.

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1. What are combined sewer overflows?
2. Where are the combined sewer overflows?
3. Why do we have CSOs?
4. Are CSOs legal?