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Fresno, CA 93706
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The City of Fresno Wastewater Management Division helps maintain the quality of life of the community by protecting the sewer system and the wastewater treatment facilities. Wastewater Management Division operates a Pretreatment Program that regulates industrial discharge at the source. The Pretreatment Program sets limitations according to the wastewater treatment facility’s needs to avoid the above problems.

This is a joint effort between City and industries to control the levels of industrial contaminants entering the sewer system by permitting, inspections, monitoring, and enforcement of industries using the RWRF services. At the same time, the program increases reclamation options (treatment and reuse) for the effluent and biosolids resulting from the wastewater treatment process. The industrial/commercial component of the wastewater flow has been estimated to be approximately 15% of the total flow.


The goal of all pretreatment programs is to keep harmful substances out that could:

  • Damage sewer systems and treatment plant structures
  • Interfere with treatment operations
  • Jeopardize worker safety by exposure to chemical hazards
  • Reduce reclamation options due to contaminated effluent and biosolids
  • Result in violations of the treatment facilities’ own Waste Discharge Requirements
  • Add maintenance, repair, operational and disposal costs to the treatment of wastewater


Introduction of metals to the RWRF has decreased since the implementation of the Pretreatment Program. Since its implementation in 1983, the Pretreatment Program has successfully reduced regulated pollutants discharged to the RWRF by more than 50%. The ability to use the effluent to irrigate non-food crops, and the use of biosolids as a compost ingredient is a clear indication of the effectiveness of the Program. The most recent audit by the California Regional Water Quality Control Board commended the Pretreatment Program as effective and consistent with federal requirements. The City of Fresno’s Pretreatment Program will continue to meet the challenges of improving performance, promoting pollution prevention, educating dischargers, and enforcing regulations to keep pollutants from impacting the RWRF performance.