The City of Sioux City developed a Wastewater Treatment Plant (WWTP) Facility Plan to evaluate current and long-term needs for wastewater treatment for the City of Sioux City, its sister cities, and industrial and commercial dischargers. The plan prioritized, evaluated, and identified cost-effective options for the city’s wastewater treatment capacity, operation, and sustainability needs over the next 30 years.

The City determined that the most cost-effective option is to upgrade and partially rebuild the City’s WWTP on its current site and is moving forward with a phased project. The WWTP is currently at capacity and has aging infrastructure, which means that its operation is not sustainable in its current condition. Inaction is not an option.

Modernizing and rebuilding the WWTP will mean the City can manage more wastewater, so there will be more opportunity for community, commercial, and industrial growth and development, allowing Sioux City to thrive.

Rebuilding and upgrading the WWTP will:

• Save ratepayers the hundreds of millions of additional dollars it would cost to build a new facility at a different location
• Include significant investment in controlling odors from the WWTP and its pumping stations
• Enable the City to stay in compliance with Environmental Protection Agency (EPA) and state regulations
• Allow the City to focus more attention at the WWTP on production of renewable fuels (biogas) and manage other beneficial projects
• Provide environmental and recreational benefits, including helping to protect and maintain the quality of the water in the Missouri River
  
  

                                       

SIOUX CITY WASTEWATER TREATMENT PLANT FACILITY PLAN

WASTEWATER TREATMENT PLANT BASIS OF DESIGN REPORT

CONSTRUCTION MANAGEMENT AT-RISK APPROACH
Sioux City is using Construction Management At-Risk, or CMR, as the delivery method for our Wastewater treatment Plant Phase 1 Improvements Project. Learn more about the process and benefits in the link above.

COUNCIL & COMMUNITY PRESENTATIONS

Sioux City Wastewater Treatment Plant Facility Plan Update to City Council - January 12, 2023

Proposed Wastewater Rate Ordinance Modifications Update to City Council - March 27, 2023

Projected Residential and SIU Charges Presentation to City Council - April 3, 2023

WWTP DESIGN ADVISORY COMMITTEE 

The Wastewater Treatment Plant Reconstruction and Design Advisory Committee will advise the City Council on concerns by users during the design stages of the Wastewater Treatment Plant reconstruction to ensure that all factors are being considered in the design and sizing of the Plant and to ensure that rates in place are adjusted to meet the financial needs for the reconstruction.
Meeting agendas, minutes, and an application to volunteer on this committee are available here. Public feedback is encouraged by email or call 712-279-6222. 

NEWS RELEASES & MEDIA COVERAGE

Sioux City Receives Grant from State of Iowa to Support Essential Local Water Quality Projects - April 3, 2025
Sioux City officials present upcoming improvements to wastewater treatment plant - KCAU, May 28, 2024
Progress slowly starting on $465M refurbishment to Sioux City's Wastewater Treatment Plant - KTIV, March 25, 2024
Committee discusses design and cost of Wastewater Treatment Plant Reconstruction - KTIV, January 4, 2024
Sioux City Wastewater Treatment Plant Inches Closer to Construction - KCAU, October 16, 2024
Sioux City to Use Construction Management At-Risk Approach for WWTP Improvement Project - November 6, 2024
Sioux City Wastewater Treatment Plant Bringing in Help for $450 Million Project - KTIV, November 14, 2024