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Phone: 913-715-8500

11811 S. Sunset Drive, Suite 2500, Olathe, Kansas 66061

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wastewater department

Johnson County Wastewater is responsible for the safe collection, transportation, and treatment of wastewater generated by residential, industrial, and commercial customers. Johnson County Wastewater works to eliminate disease-causing bacteria and to protect the environment for human and aquatic life. Johnson County Wastewater's role is to ensure that our streams, rivers and lakes are free from disease-causing bacteria and viruses that are harmful to the public health.

Department News

Update on Tomahawk Creek expansion and upgrade
April 21, 2016

The Tomahawk Creek Wastewater Treatment Facility, located at 10701 Lee Boulevard in Leawood, was originally built in 1955. More than 60 years later, times have changed and so have the needs of the facility. New water quality regulations require upgrades to the existing Tomahawk Creek facility to improve water quality in Indian Creek and downstream waters. The facility currently treats seven million gallons per day, 40 percent of the wastewater collected from parts of Leawood, Olathe, Overland Park and Prairie Village. The remaining 60 percent is currently sent to Kansas City, Mo., for treatment. In 2016, $17 million was budgeted for payments to Kansas City, Mo. The cost to continue sending flow and paying Kansas City for treatment will substantially increase because of the city's $4.5 billion planned infrastructure improvements over the next several decades.

Johnson County Wastewater has studied how to accomplish two goals in the most cost-effective manner:

  1. Meeting new water quality regulations requiring upgrades to the existing treatment facility.
  2. Confirm a previous study recommendation to expand the Tomahawk Creek Wastewater Treatment Facility and discontinue sending flow to Kansas City, Mo.

A previous study identified $280 million in investments to expand the Tomahawk Creek Facility to treat all flow as the most cost-effective, long-term solution.

The project team is nearing completion of the preliminary phase of the project and has completed several public outreach meetings, including a presentation to the Leawood City Council on Feb. 1, 2016, and a public meeting on Mar. 22, 2016.

A recommendation for the next phase of the project was presented to the Johnson County Board of County Commissioners (BOCC) on Mar. 31, 2016. At that time the BOCC directed JCW to execute the regulatory permit for the project and to bring forward an authorization for design of the recommended improvements. Pending BOCC approval of that authorization, design of the improvements will begin in Summer 2016. Construction is projected to begin in Summer 2018 and the improved facility is anticipated to be placed in service by the end of 2021. If you have any questions regarding the project, please contact Johnson County Wastewater's Director of Communications at 913-715-8572.

Project background

The Tomahawk Creek Wastewater Treatment Facility (WWTF) 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. The WWTF treats only a portion of the flow arriving at the plant, with the balance being diverted around the plant to the Linking Interceptor which carries it to Kansas City, Mo., for ultimate treatment at their Blue River WWTF.