top of page


Open House - Thursday, October 6, 2022  

Johnson County Wastewater has identified improvements needed at the Nelson Wastewater Treatment Facility. Join your neighbors for a Public Open House at the facility to learn about the project, view preliminary computer-generated site images of the completed facility, and tell us what is important to you. 



Thursday, Oct. 6, 2022  – Come and Go: 5 - 7 p.m. 
Nelson Wastewater Treatment Facility, 4800 Nall Avenue, Mission, KS 66202
(There will be signage and staff at the facility to direct you.) 


  • Postcards notifications about the Open House were mailed to addresses within 2000 feet of the Nelson WWTF, to attendees of the previous Open House, and to addresses submitted on the website requesting to be updated.

  • The information presented at the meeting will be posted on this website a week after the Open House and a survey will also be posted where you can give us feedback after viewing the information. 

  • You can register below to receive email notifications and updates on the project. 

  • We follow Johnson County COVID-19 protocols. Please check the website for any updates on scheduling and protocols. 

  • If you have any questions, please email us at

DOWNLOAD PDF of POSTCARD (Click on the image below)

NOVEMBER 7, 2021
Below is a link to the official NOTICE OF HEARING BEFORE THE CITY OF MISSION PLANNING COMMISSION that was mailed to addresses within a 200’ radius of the Nelson Wastewater Treatment Facility.

Open House -
Wednesday, Sept. 29, 2021 | In Person
Thursday, Sept. 30, 2021 | Online/Virtual

Johnson County Wastewater has identified improvements needed at the Nelson Wastewater Treatment Facility.

Join us at the facility or online for an
Learn about the facility and tell us what is important
to you on the upcoming project.





Wednesday, Sept. 29, 2021

Come & Go | 5 - 7 p.m.


  Nelson Wastewater Treatment Facility

   4800 Nall Avenue

   Mission KS 66202


(There will be signage & staff at the Facility to direct you.)


Thursday, Sept. 30, 2021

7 – 8 p.m.


LOCATION:  Online / Virtual

Register in advance to attend the Virtual Open House
by clicking on the button below.

  • The email that you use to register should be the email that is associated with your Zoom account. Note: If you do not have a Zoom account, there is a link on the signup where you can easily get a free account. If you have any questions, please email

  • You may register up until the time of the event.

  • Please note, after registering you will receive a confirmation email from Zoom containing information and the link to join the Virtual Open House. (you will want to save this link) 

Nelson Wastewater Treatment Facility Improvements Project


Treatment and Sewer Sampling | Late August-Early September 2021
NOTICE mailed mid-August 2021

Dear Neighbor:

An Improvements Project is beginning for the county’s Nelson Wastewater Treatment Facility located at 4800 Nall Ave. in Mission, Kansas. The Improvements Project will address aged and deteriorating infrastructure and new regulatory requirements by upgrading the treatment facility, collection system pump stations, and sewer piping. 

WHAT IS HAPPENING? The first phase of the project is the design of the improvements. To develop the most efficient design, we will be taking samples from within the treatment facility and key points in the sewer system. Data collected will be used to improve the design of new treatment and odor control facilities. During the sampling period, odors from the sewer system may be more noticeable.

WHY IS IT NEEDED? Johnson County Wastewater (JCW) currently adds chemicals in the collection system to control odors from the sewer system and treatment facility, but these chemicals can impact the design and performance of the treatment process. Therefore, JCW needs to temporarily turn off the odor control chemicals for a portion of the special sampling program to collect and analyze samples with and without the addition of the chemical to evaluate its impact on the facility design.

HOW LONG WILL IT TAKE? JCW is minimizing the duration of the sampling study to make the amount of time without chemical addition as short as possible. Sampling will take place for two to three weeks, scheduled in late August, early September, with the goal of completion before the Labor Day holiday. Please note, planned sample dates are weather-dependent and may shift. The odor control chemicals will be turned off for approximately one week of the sampling period.

We appreciate your understanding. We will work to complete this task as quickly as possible while maintaining a safe work environment for our team and the community.


Johnson County Wastewater

bottom of page