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SANITARY SEWER OVERFLOWS (SSOs)

Interactive SSO Report

A SSO is any overflow, spill, release, discharge or diversion of untreated or partially treated wastewater from a sanitary sewer system.  SSOs often contain high levels of suspended solids, pathogenic organisms, toxic pollutants, nutrients, oil, and grease.  SSOs pollute surface and ground waters, threaten public health, adversely affect aquatic life, and impair the recreational use and aesthetic enjoyment of surface waters.  Typical consequences of SSOs include the closure of beaches and other recreational areas, inundated properties, and polluted rivers and streams. 

Sanitary sewer system agencies covered under Statewide General Waste Discharge Requirements for Sanitary Sewer Systems (WQO No. 2006-0003-DWQ), referred to as Enrollees, are required to report all SSOs for which their agency has responsibility into the State Water Resources Control Board’s SSO database.  Enrollees are also able to report sewage discharges from privately owned laterals or collection systems, for which the Enrollee has knowledge of the event but is not responsible, on a voluntary basis.  These discharges are known as private lateral sewage discharges (PLSDs) and are separate from SSOs.  Only Enrollees are allowed to submit and modify the information associated with their sanitary sewer system in the SSO database.  Please visit the SSO Program Web Page for additional information on SSO reporting and the State Water Board’s regulatory efforts to reduce the numbers and volumes of SSOs statewide.  

The requirement to report SSOs via the CIWQS website was phased in and all enrollees were required to begin reporting by September 2, 2007.

The SSO Report allows users to view summary information of SSOs and private lateral sewage discharges reported by Enrollees as well as complete reports submitted for specific sewage discharge locations.