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{{Short description|Discharge of untreated sewage}}
{{distinguish|Combined sewer overflow}}
[[File:Sewer overflow RI EPA.jpg|thumb|right|A [[sanitary manhole|manhole]] cover unable to contain a sanitary sewer overflow]]
'''Sanitary sewer overflow''' ('''SSO''') is a condition in which untreated [[sewage]] is discharged from a [[sanitary sewer]] into the environment prior to reaching [[sewage treatment]] facilities. When caused by rainfall it is also known as '''wet weather overflow'''. Causes of sanitary sewer overflows include: Blockage of sewer lines, [[infiltration/Inflow]] of excessive [[stormwater]] into sewer lines during heavy [[rainfall]], malfunction of [[pumping station]] lifts or electrical [[power failure]], broken sewer lines. Prevention of such overflow events involves regular maintenance and timely upgrades of infrastructure.
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