Wastewater (Sewer)

Every time used water runs down the drain inside a home or flushes down the toilet, it travels through about 900 miles of sanitary sewer lines to the Regional Wastewater Control Facility (RWCF), where it is treated before going into local waterways.


  • The RWCF has the capacity to treat 55 million gallons of sewage per day.
  • The facility collects and treats an average of 33 million gallons of wastewater daily, from approximately 116,000 sewer connections in the City and nearby San Joaquin County areas.
  • The RWCF cogeneration facility generates 17,600 kilowatts/year.
    • The decomposition process for biosolids provides some of the energy for the engine generators.
    • This onsite energy production supplies most of of the plant's power needs.
  • The RWCF three-stage treatment operations are closely regulated under the Wastewater National Pollutant Discharge Elimination System  (NPDES) permit.
  • The NPDES permit requires a Sewer System Management Plan (SSMP) to operate and maintain the treatment facility and procedures for Sanitary Sewer Overflows (SSOs). 

Report Problems

  • To report sewer spills, odors, leaks or after-hours emergency assistance:


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 --- 2/9/2021