High Quality Content by WIKIPEDIA articles! Sanitary sewer overflow (SSO) is a condition whereby untreated sewage is discharged into the environment prior to reaching treatment facilities thereby escaping wastewater treatment. When caused by rainfall it is also known as wet weather overflow. It is primarily meaningful in developed countries, which have extensive sewage treatment facilities. The main causes of SSO are: * Infiltration of excessive stormwater into sewer lines during heavy rainfall * Rupture or blockage of sewerage lines * Malfunction of pumping station lifts or electrical power failure * Human operator error at treatment plant facilities. SSO is distinct from a combined sewer overflow (CSO), a similar problem of untreated sewage discharges, but which occurs only in a municipal system specifically designed with a combined sewer.

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