Johnson County Wastewater has many active public and privately-financed projects that address regulatory requirements, system growth, and asset rehabilitation and replacement needs.  

Investing in Our Infrastructure 

Johnson County is a community that is thriving both socially and economically. This continued prosperity is strengthened by having reliable and sustainable wastewater networks with the capacity to support the community. Johnson County Wastewater's Engineering Group manages sewer design and construction projects throughout the County. These improvements are being built so that we can continue to provide you, our customers, with reliable sanitary sewer service.  Summaries for some of our primary Capital Projects are listed below.   

Public Capital Projects

Integrated Plan

JCW is responsible for providing sanitary sewer services for more than 500,000 people in the County. To meet these commitments, JCW must continually manage, maintain and improve a variety of infrastructure assets.

To continue providing the same high level of service, JCW understands that future program improvements need to be prioritized in a way that balances water quality benefit, system growth and asset renewal needs. 

In 2019, JCW initiated a system-wide planning effort called Integrated Planning aimed at developing a long-term, prioritized infrastructure investment strategy that addresses wastewater needs and meets US Environmental Protection Agency and Kansas Department of Health and Environment requirements over the next 25 years.

The Phase 1 Integrated Plan (IP) identified approximately $2.1 billion (in 2018 dollars) of projects that need to be implemented to meet these goals. JCW intends to continuously review and update the IP to address the community’s service needs as they evolve over time.  

For additional information, visit JCW’s Integrated Plan website:

Tomahawk Creek Wastewater Treatment Facility Improvements

The Tomahawk Creek Wastewater Treatment Facility (WWTF) was originally constructed in 1955.  Since that time, the facility has been expanded to treat wastewater flows from parts of Leawood, Overland Park, Olathe and Prairie Village, Kansas.  Over time, continued population growth in these areas eventually exceeded the treatment capacity of the facility.  Located at 10701 Lee Boulevard, Leawood, Kansas, in Johnson County, the Tomahawk Creek WWTF currently serves about 150,000 residents.

The updated Tomahawk Creek WWTF improves water quality while providing cost-effective long-term treatment solutions for Johnson County customers.  Construction of the latest $270 million expansion and upgrade of the facility began in 2018 and was completed on schedule and on budget.  The expansion was a joint project of Johnson County Wastewater, McCarthy Building Companies-Kansas City, Black & Veatch Corporation and HDR.  Due to the complexity and tight schedule, Johnson County Wastewater chose to use the collaborative delivery method of Construction Manager at Risk (CMAR) with McCarthy serving as the construction manager.

For more information, visit:

For schedule information, visit:

Metcalf and 103rd Interceptor Relocation and Capacity Improvements

Objective: Johnson County Wastewater is working to increase the capacity of the sanitary sewer system in the general area of 103rd Street and Metcalf Avenue. Referred to as the Metcalf and 103rd Interceptor Relocation and Capacity Improvements, this project addresses approximately 3,000 linear feet of 21-inch through 30-inch diameter existing sanitary sewer interceptor in Overland Park, Kansas, near Pinehurst Park and the Indian Creek Shopping Center that requires additional capacity and protection from streambank erosion.

The additional capacity is needed to provide the desired long-term level of service for the tributary area during large wet weather events. This project will provide more dependable and environmentally sound sanitary sewer service to the area. 

Project Status: The Contractor has completed the tunnel boring under Metcalf Avenue and is installing the carrier pipe in the tunnel. The Contractor has also begun excavation for sewer installation on the downstream end of the project, east of Barkley Street. The Contractor will begin the boring under Indian Creek west of Metcalf Avenue in November. Updated construction schedules and traffic control and detour information will be posted to this webpage as they become available during construction.

Anticipated Traffic impacts:

  • Pedestrian trails east of Metcalf Avenue are currently impacted in anticipation of bypass pumping. Signage is posted along the Indian Creek trail north of 103rd Street and at Lamar Avenue and Indian Creek. Detour routes are along the sidewalks along Lamar Avenue and 103rd Street.
  • Construction under Metcalf Avenue will use trenchless technologies and not impact traffic on Metcalf Avenue.
  • Construction across Barkley Street will require brief closure (about 3 days), beginning November 2022.
  • Construction east of Metcalf Avenue and south of 101st Street for the sanitary sewer stream crossing repair will require lane reductions (about 3 weeks), beginning November 2022.
  • Construction across the access road off 103rd Street for the Walmart Neighborhood Market will require brief closure (about 2 days), beginning December 2022.
  • Construction across the access road off 103rd Street for the Jose Peppers area will require brief closure (about 2 days), beginning February 2023.
  • Construction across 103rd Street (west of Metcalf Avenue) will require closure of the street for up to two weeks, beginning March 2023.
  • Construction south of 102nd Street (west of Metcalf Avenue) will require lane reductions (about 1 week), beginning April 2023.
  • Construction across 103rd Street (east of Metcalf Avenue) will require closure of the street for up to two weeks, beginning May 2023.
  • Construction east of the Marty Street and 103rd Street intersection will require lane reductions (about 1 week), beginning June 2023.

Key Contacts:

Information Links  Notification update letters were mailed in March 2021 to property owners and local businesses along the anticipated alignment.

General location map >>

Nelson Complex Wastewater Treatment Facility Improvements

The Nelson Complex Wastewater Treatment Facility (WWTF) is Johnson County Wastewater's (JCW) oldest treatment facility, dating back to the 1940s.  A significant portion of the facilities are at or near the end of their useful service life and the current treatment technology is not capable of meeting future water quality standards. With the age and complexities of the facilities, pumping and collection systems, extensive upgrades are needed to modernize the Nelson Complex and bring it into compliance with new regulations.

Johnson County Wastewater (JCW) has selected a team of Black and Veatch and HDR to design improvements to the facility to meet the County’s long-term needs for wastewater service and wet weather management. JCW also chose to use the Construction Manager at Risk alternative delivery method for this project and selected McCarthy Building Companies to perform this work.    

This project will be partially funded through a $281 million U.S. Environmental Protection Agency (EPA) Water Infrastructure Finance and Innovation Act (WIFIA) loan.  

For more information, visit:   

For project schedule information, visit:


State Line Road Pump Stations and Forcemain

The purpose of this project is to collect flows from Johnson County Wastewater’s (JCW’s) Leawood Service Area that currently drain across the State Line into the Kansas City, Missouri (KCMO) collection system and to convey those flows to JCW’s newly completed Tomahawk Wastewater Treatment Facility.

JCW evaluated the business case for this project and determined that the project will save JCW over $100 Million over 20 years, compared to the cost of continued treatment of all flows by KCMO.  Along with these long-term savings, this project will pay for itself in approximately 6 to 7 years, providing near term financial benefits to the residents of Johnson County.

For additional information, visit: STATELINE PSs and FM