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's 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 than one mile of pipe or sewer lines, which
  • Conveys untreated wastewater to a publicly owned treatment facility.


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


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


Regulatory Requirements

Dental Amalgam Program

The Environmental Protection Agency (EPA) has enacted pretreatment standards to reduce discharges of dental amalgam containing mercury and other metals from dental offices into publicly owned sewer treatment systems. This includes all dental facilities in the City of Stockton area that discharge wastewater to the City of Stockton's sanitary sewer system.


The Dental Office Category regulation is contained in the EPA Effluent Guidelines, under the Dental Office Category,40 CFR Part 441, and requires dental offices to use amalgam separators and best management practices recommended by the American Dental Association (ADA). 


Existing and new sources must complete and return the one-time compliance report form to the City of Stockton within the required timeframe to certify compliance with these new regulations:


 For questions, please Contact Us.



External Links

State Water Resources Control Board - Statewide General Discharge Order

Environmental Protection Agency (EPA) - Dental Effluent Guidelines 



This City of Stockton web page last reviewed on --- 12/13/2017