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Join Us on February 22, 2024 for OPEN HOUSE 3 
Johnson County Wastewater has been implementing improvements at the Nelson Wastewater Treatment Facility. Join your neighbors at the third Public Open House with the Project Team. View the final design, learn about what is currently happening and what to expect over the next 18 to 24 months, ask questions, and let us know what is important to you.
DATE: Thursday, Feb. 22, 2024
TIME:  5 - 7 p.m. (come and go)
Roeland Park Community Center,
Skyline Room,
4850 Rosewood Dr.,
Roeland Park, KS 66205

To request ADA accommodations, please visit

  • The information from the Open House will be posted a week after the event. 

  • A survey will be posted with the open house presentation where you can give us your feedback after viewing the information.

  • Register to receive email notifications and updates on the project.

UPDATE - Jan 24, 2024:​ 
Trickling Filter Decommissioning 
Starting January 29.

Construction of the Nelson Wastewater Treatment Facility continues.  The next key step is to remove three trickling filters on the northeast corner of the site (highlighted in yellow). The project team has been delayed due to weather but is now ready to proceed.


The trickling filter technology is being removed because it cannot meet future water quality requirements. Trickling filters have historically been a source of odor generation and will ultimately be replaced with a modern biological nutrient removal system.

Details about the activity are as follows:
  • The location of this infrastructure is highlighted
    in yellow in the figure. 

2023-12-08-Nelson-trickling filtersupdate.jpg
  • Starting January 29th, the team will be running diesel bypass pumping for five days to allow the treatment process to continue without the trickling filters.  Bypass pumping will need to run 24/7 during this time to continue to process water, however the bypass pumps will be enclosed to minimize noise.  

  • Starting February 12th, the trickling filters will be removed from service, with the activities lasting about a week.

  • During this period (February 12th–16th), there is an increased potential for odor generation.  We will implement the same measures taken in removing the first filter to minimize the odor potential, including the installation of chemical systems meant to prevent the odor from occurring and scheduling to minimize the duration of the activities.  

  • Demolition of the trickling filters themselves will last through February, but the chances of odor are significantly reduced after the week-long period indicated above.

  • Dates noted may need to be adjusted due to weather or other factors.

If you detect odors we would like to know so we can address them.  You can fill out an odor complaint form by clicking on the “Odor Complaint Form” button. This form notifies Operations & Maintenance staff and top leadership directly. 

Nelson Wastewater Treatment Facility Improvements Project

Nelson Complex Wastewater Treatment Facility (WWTF) is Johnson County’s oldest treatment facility, and its service area is comprised of 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, with Turkey Creek to the west and Mission Main to the east.

The improvements project will upgrade the treatment facility in order to address aged and deteriorating infrastructure and to comply with new regulatory requirements.  

Information pertaining to the project, including schedules and activities, will be available on this site and updated as the project progresses.


Nelson WWTF Early Design Phase Rendering

The Household Hazardous Waste Facility has moved.
(click here for more information)

What is happening on site? To find out, visit the page: Where & When

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