Sanitary Sewer Overflows (SSOs)

Occasional unintentional discharges of raw sewage from municipal sanitary sewers due to blockages, line breaks, sewer defects that allow storm water and groundwater to overload the system, lapses in sewer system operation and maintenance, power failures, inadequate sewer design, and vandalism. EPA estimates that there are at least 23,000 to 75,000 SSOs per year.

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