Pretreatment Program

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The Pretreatment Department sets forth uniform requirements for Users of the Publicly Owned Treatment Works (POTW) for the City and enables the City to comply with all applicable State and Federal laws, including the Clean Water Act and the Federal General Pretreatment Regulations (Title 40 of the CFR Part 403). 

General duties of the Pretreatment Department include, but are not limited to:
  • The prevention of pollutants into the POTW and the stormwater system that will interfere with its operation. 
  • The prevention of pollutants into the POTW and the stormwater system that will pass through the POTW and stormwater system, inadequately treated, into receiving waters, or otherwise be incompatible with the POTW and stormwater system.
  • To protect both POTW and stormwater system personnel who may be affected by wastewater, sludge, and stormwater in the course of their employment, as well as the general public.
  • To promote reuse and recycling of industrial wastewater and sludge from the POTW.
  • To enable the City to comply with its NPDES permit conditions, sludge use and disposal requirements, and any other Federal or State laws to which the POTW and stormwater system is subject. 



Frequently Asked Pretreatment Questions: 

  •  What is an Industrial User or Significant Industrial User?
    • An industrial user is any non-residential user that discharges non-domestic wastewater to the City of Sioux City's sanitary sewer system.  A significant industrial user (SIU) are permitted through the City's Pretreatment Program and discharges an average of 25,000 gallons per day or more of process wastewater, or contributes a process waste stream which makes up 5% or more of the average dry weather hydraulic or organic capacity of the treatment plant.  An industrial user may be designated as an SIU if there is a potential for adversely affecting the operation of the City's wastewater treatment plant. 
  • What steps are required to be completed in order to be a regulated industrial industry?
    • If the industry meets the above definition of a SIU, they then must apply for a permit to discharge wastewater into the City of Sioux City's sewer system. The application must be filled out and returned to the Pretreatment Program located at 3100 S. Lewis Blvd, Sioux City, IA  51106. 
  • What are some industries that require a wastewater review?
 Copper Forming  Brewery
 Dairy Products  Commercial Laundry
 Manufacturing  Distillery
 Electroplating  Meat Packing
 Feedlots  Poultry Plant
 Fertilizer Manufacturing  Rendering
 Grain Mills  Any discharge >25,000 gpd              
 Iron and Steel Manufacturing  
 Metal Finishing  
 Pesticide Manufacturing  
 Pharmaceutical Manufacturing  
  •  How long do I have in order to report a slug discharge or permit noncompliance?
    • Any permitted facility that experiences an upset in operations that places the facility in a temporary state of noncompliance with the provisions of either the permit or with chapter 13 of the municipal code, must inform the City of Sioux City within 24 hours of becoming aware of the upset. 
  • When are monthly self-monitoring reports or additional sample testing paperwork due?
    • Paperwork for permit monitoring or additional testing that is obtained at the designated sampling location must be received to the Pretreatment Department or postmarked by US Mail by the 10th of the month.


Odor Control: 

To report an odor, please click on the following link or contact us directly by calling 202-3160 at any time. 
If the odor is in your home, the simple solution is to periodically pour water (one or two cups) into the drain to refill the trap. As a property owner, you are responsible for maintaining the private sewer line from the house to the city sewer main. If the odor continues in your home, you may want to reach out to a licensed plumber.

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