SewerLooking down into a sewer pipe

The Regional Wastewater Control Facility is a 55 Million Gallon per day (MGD) tertiary treatment facility.  The facility serves the City of Stockton and outlying County areas and processes an average of 33 MGD. 


After treatment, under the restrictions and requirements of a National Pollutant Discharge Elimination System (NPDES) permit, the water is discharged into the San Joaquin River.


Treatment operations at the facility are closely regulated under our Wastewater NPDES permit.  Part of that permit requires a Sewer System Management Plan (SSMP) that describes the procedures and activities to operate and maintain the treatment facility, to reduce Sanitary Sewer Overflows (SSOs), and reporting procedures should an SSO occur.


The SSMP complies with the State Water Resources Control Board General Waste Discharge Requirement (GWDR).  The GWDR provides a consistent approach for reducing SSOs and applies to all publicly-owned collection system agencies with:

  • more then one mile of pipe or sewer lines and
  • which convey untreated wastewater to a publicly owned treatment facility.


To report spills, odors, leaks, or after-hours emergency, please call our 24-hour emergency Emergency Service Center.  For non-emergencies, please Contact Us .


For information about paying your bill or starting/stopping sewer services, please visit the Utility Billing Department.


External Links

State Water Resources Control Board - Statewide General Discharge Order

This City of Stockton web page last reviewed on --- 11/25/2015