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Public Advisory: Please take our population health survey ... | last updated: 04/08/2020 - 3:26pm | + read more

Johnson County Department of Health and Environment (JCDHE) is asking Johnson County residents to complete a short survey in order to understand how many people in Johnson County have or do not have symptoms of coronavirus (COVID-19). The survey will close at 10 a.m. on Friday, April 10.

Survey link - Population Health Survey

County Manager's Office

Phone: 913-715-0725

111 S. Cherry St., Suite 3300, Olathe, KS 66061

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Tomahawk Creek Wastewater Treatment Facility Project

Tomahawk Creek Wastewater Treatment Facility construction site

(Information through Nov. 30, 2019)

Project Name: Tomahawk Creek Wastewater Treatment Facility (WWTF) Expansion

Date Authorized: July 31, 2014 (project def.); May 5, 2016 (design); March 2, 2017 (pre-construction); March 29, 2018 (construction)

Project Authorization: $4,100,000 (project definition); $21,387,000 (design); $2,680,000 (preconstruction); $306,678,678 (construction funding including $23,131,462 (engineering construction services), $267,892,045 (Construction GMP, and bonds, PAF, and other project costs)) Total Project Authorization = $334,990,678

Delivery Method: Construction Manager at Risk (CMAR)

Design Firm: Black & Veatch/HDR Engineers

Contractor: McCarthy Building Companies, Inc. (CMAR)

Completion Date (Estimated): March 1, 2022 (Substantial Completion)

Major Milestones:

  • McCarthy’s current schedule has them completing Lee Blvd improvements during Spring 2020.
  • KCPL substation is scheduled for June 2020 startup.
  • Next contractual milestone is the liquids process contract milestone dated October 25, 2021. This will allow JCW to begin the process of eliminating flows to KCMO.

Future Pending Action(s):

  • The RTA requested additional changes be made to the final Plat. The Plat is with Leawood for signature, after which it will be sent to the Chairman for signature. The Board authorized the Chairman to sign the plat on March 29, 2018 under BS 18-13.
  • The team is working on easements for WaterOne and KCPL distribution lines. It is anticipated that the easements will be presented to the Board in Q1 2020.


  • McCarthy is currently on schedule and on budget.
  • Construction is approximately 38% complete.
  • Poured 37,835 cy of structural concrete out of 50,000 cy.
  • The 800 drilled piers for buildings and structures are complete.
  • Underground utilities are over 70% complete.
  • The majority of work in progress includes earthwork, buried pipes and electrical utilities, concrete structures, and interior piping. Concrete foundations and walls are being poured for multiple buildings and structures.
  • Masonry work has begun. They have completed the walls on the garage expansion at the existing Influent Pump Station.
  • Leakage testing commenced on concrete structures and will continue through next year.
  • Lee Blvd work will require approximately 2 months for shut down of Lee Blvd. The team is working with Leawood to minimize impact to residents and City holiday schedule.
  • McCarthy will continue early morning work hours for concrete pours. They have notified Leawood of this activity per the hours of operation memo of understanding and a notice has been placed on the website.
  • Team held a 60% workshop to review the control and automation screens for facility operation.
  • The team is posting information to Johnson County Facebook page and the project website (www.jcwtomahawk.com) about wastewater treatment at the Tomahawk Creek WWTF as part of a monthly educational outreach series.

Project Website


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