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 Management 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, including: 

  • 6 major wastewater treatment facilities (WWTFs) 
  • 31 pump stations 
  • 2,300 miles of gravity sewer lines 
  • 58,000 manholes 
  • 23 miles of low-pressure sewers 
  • 42 miles of force mains 

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

In 2012, the US Environmental Protection Agency (EPA) developed the Integrated Municipal Stormwater and Wastewater Planning Approach Framework to provide more flexibility in prioritizing and implementing long-term holistic solutions. This flexibility will allow us to balance social and environmental priorities with the need to keep rates affordable for our customers.  

Using this framework, JCW used a streamlined approach to develop a Phase 1 Integrated Plan for the next 25 years. This Phase 1 Plan is provided here: 

During the Phase 1 plan development, JCW identified data gaps and areas where further study was needed to fully inform the long-term plan. JCW also identified the need for a more comprehensive stakeholder outreach program. 

In October 2020, JCW competitively selected HDR Engineers to perform the Phase 2 Integrated Planning effort. The team will use the additional study information and stakeholder input to revise the long-term prioritization schedule.

Tomahawk Creek Wastewater Treatment Facility Improvements

The Tomahawk Creek Wastewater Treatment Facility, located at 10701 Lee Boulevard in Leawood, was originally built in 1955. The facility treats wastewater from the Tomahawk Creek watershed, the Indian Creek watershed downstream of the Douglas L. Smith Middle Basin WWTF (Lower Indian Creek), and the Dykes Branch sub-watershed.

Prior to construction, the Tomahawk WWTF treated 7 million gallons per day, which was 40 percent of the wastewater collected from parts of Leawood, Olathe, Overland Park and Prairie Village. The remaining 60 percent was sent to Kansas City, MO for treatment. Once construction is complete, the facility will treat all of the flow.

Current Status 

Johnson County Wastewater is proceeding with the construction of the improvements to the Tomahawk Creek Wastewater Treatment Facility. This project utilizes an alternative delivery construction approach called Construction Manager at Risk, or CMAR. Groundbreaking occurred in April 2018 and the facility is scheduled to start treating flows in October 2021.

More information about the construction activities, the individual processes at the treatment facility and more can be found at the Tomahawk Creek Wastewater Treatment Facility Expansion Website  

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 will begin site mobilization during the week of June 13th. Updated construction schedules and traffic control and detour information will be posted to this webpage as they become available during construction.

Anticipated Traffic impacts:

  • 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 late June 2022.
  • Construction under Metcalf Avenue will use trenchless technologies and not impact traffic on Metcalf Avenue.
  • Pedestrian trails in the area will be impacted. Detours will be provided, beginning late June 2022.
  • Construction across Barkley Street will require brief closure (about 3 days), beginning August 2022.
  • Construction across the access road off 103rd Street for the Walmart Neighborhood Market will require brief closure (about 2 days), beginning September 2022.
  • Construction across the access road off 103rd Street for the Jose Peppers area will require brief closure (about 2 days), beginning November 2022.
  • Construction across 103rd Street (west of Metcalf Avenue) will require closure of the street for up to two weeks, beginning December 2022.
  • Construction south of 102nd Street (west of Metcalf Avenue) will require lane reductions (about 1 week), beginning January 2023.
  • Construction across 103rd Street (east of Metcalf Avenue) will require closure of the street for up to two weeks, beginning February 2023.
  • Construction east of the Marty Street and 103rd Street intersection will require lane reductions (about 1 week), beginning March 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

Nelson Complex Wastewater Treatment Facility & Service Area Long Term Capital Improvement Plan Summary Report 

The Nelson Complex service area consists of the Nelson Complex Wastewater Treatment Facility (WWTF) and two main tributary basins - Turkey Creek (SMTC) and Mission Main (MTM1). The service area, located in northeast Johnson County, is approximately bounded by 47th Street to the north, 95th Street to the south, Pflumm Road to the west, and State Line Road to the east. Metcalf Avenue roughly divides the two basins, Turkey Creek to the west and Mission Main to the east. 

The WWTF was constructed in phases, beginning in the 1940’s. A significant portion of its facilities are at or near the end of their useful service life. The treatment technology currently in place is not capable of meeting future water quality standards. 

The collection system was also constructed with technologies that are now outdated. As a result, it experiences significant issues related to limitations in wet weather capacity. In addition, the system contains four satellite peak excess flow treatment facilities (PEFTFs) which discharge directly to adjacent waterways during significant wet weather events after primary treatment and disinfection. 

In 2018, Johnson County Wastewater (JCW) commissioned HDR, in association with CH2M and WCS, to determine the optimum solution to these issues and develop a long term capital improvement plan for the Nelson Complex service area. This study aided JCW and Kansas Department of Health and the Environment (KDHE) in negotiating the current and future Nelson WWTF permits, including planning for the future elimination of the PEFTFs.  

See the Nelson Wastewater Treatment Facility Improvements Project site for more information.  

Direct questions regarding this project to: 

Patrick Denning, PE 
Assistant Chief Engineer – Existing Infrastructure 
4800 Nall Ave. 
Mission, KS 66202