California Water Boards' Annual Performance Report - Fiscal Year 2017-18
PLAN AND ASSESS: SEWAGE SPILLS
GROUP:
SANITARY SEWER OVERFLOWS (Collection Systems)
SANITARY SEWER OVERFLOWS (Collection Systems)
MEASURE:
SIZE OF SEWER SYSTEMS SEWAGE SPILLS
SIZE OF SEWER SYSTEMS SEWAGE SPILLS
MESSAGE:
| KEY STATISTICS FOR FY 2017-18 |
MEASUREMENTS - Data last updated on:
| Region | Miles of Gravity Sewer |
Miles of Pressure Sewer |
Total Size of Collection System (Miles) |
Facilities With 1 or More Sewage Spill | Number of SSO Events | Volume of SSOs | Average SSOs per 100 miles | Average Volume of Spills per 100 miles | SSO Events per Facility with Spills |
|---|
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WHAT THE MEASURE IS SHOWING
WHY THIS MEASURE IS IMPORTANT
TECHNICAL CONSIDERATIONS
- Data source: CIWQS. Period July 1, 2017 to June 30, 2018 .
- Unit of Measure: Average Number of Spills per 100 miles: Measures the number of sewer overflows per 100 miles of sewer lines. Average Volume of Spills per 100 miles: Measures the volume in gallons of sewer overflows per 100 miles of sewer lines.
- Data Definitions: Sanitary Sewer: A pipe or conduit (sewer) intended to carry wastewater or water-borne wastes from homes, businesses, and industries to the POTW. Sanitary Sewer Overflows (SSO): Untreated or partially treated sewage overflows from a sanitary sewer collection system.
- References: Information on the Sanitary Sewer Overflow Reduction Program
The Sanitary Sewer Overflows Incident Map
The Interactive SSO Report
GLOSSARY
- Sanitary Sewer Overflow
- A sanitary sewer overflow (SSO) is any overflow, spill, release, discharge or diversion of untreated or partially treated wastewater from a sanitary sewer system. SSOs do not include overflows from blockages or other problems within a privately owned lateral.
- Sanitary Sewer Overflow Reduction Program
- In May, 2006, the State Water Board adopted a Statewide Sanitary Sewer Order (ORDER NO. 2006-0003-DWQ) to address the issue of SSOs in a consistent and uniform manner statewide. Through the order, California became the first state in the nation to implement a program focused on the regulation of sanitary sewer systems. Sanitary sewer system agencies covered under the order, referred to as Enrollees, are required to report all SSOs for which their agency has responsibility into the State Water 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.
