CSOs Explained
What's a CSO?
Combined Sewer Overflows (CSOs) are an overflow of sewage and stormwater into Puget Sound. They occur as a direct result of stormwater entering the sanitary sewer system. Stormwater entering the sanitary sewer system uses the available system capacity and as the pipes fill and wastewater pump stations reach their capacity a CSO event can occur.
Combined System  |
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Separated in the Right of Way  |
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Separated System - Ideal  |
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