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[[File:Sewer overflow RI EPA.jpg|thumb|right|A [[manhole]] cover unable to contain a
'''Sanitary sewer overflow''' ('''SSO''') is a condition in which untreated [[sewage]] is discharged into the environment prior to reaching [[sewage treatment]] facilities. In Europe the term Combined Sewer Overflow (CSO) is often used. When caused by rainfall it is also known as '''wet weather overflow'''. It is primarily meaningful in [[developed countries]], which have extensive treatment facilities. The main causes of SSO and CSO dry spills are:
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