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What is difference between a combined sewer overflow (CSO) and a sanitary sewer overflow (SSO)?

April 26, 2017combined CSO difference overflow sanitary sewer SSO

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What is difference between a combined sewer overflow (CSO) and a sanitary sewer overflow (SSO)?

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Unlike the planned combined sewer overflows, a sanitary sewer overflow (SSO) is a spill of raw sewage and untreated sanitary wastewater into the natural environment that occurs as a result of an accident, equipment malfunction, or flooding from an extreme weather event. These spills release concentrated sewage into the environment and do not occur as a result of normal operations. If a spill occurs, it is investigated and reported to the Ministry of Environment, the Spills Action Centre and downstream users.