Central Contra Costa Sanitary District
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Photo of CSO street work. 

Collection System Operations (CSO)

Based in Walnut Creek, a crew from Collection Systems Operations (CSO) can reach the site of a sewer overflow anywhere in the CCCSD service area in 30 minutes or less.

Along with emergency response, CSO is responsible for the cleaning, maintenance, and repair of the 1,500 miles of underground pipeline that makes up the District’s sewer system. These pipes range in size from 6 inches to 102 inches in diameter. Maintaining this system is an ongoing process involving approximately 40 employees.

Visit the Sewer System section on this site for more information.