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 as well as some of the pump stations and mains 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.

Rendering of the current Nelson Wastewater Treatment Facility

Nelson Wastewater Treatment Facility 2021

PROJECT UPDATE: May 18, 2022
  • Planning work continues for facility improvements at Nelson. The planning is taking into consideration community input from the September 2021 Open Houses for the facility as well as the construction phase. This fall we plan to have additional outreach events to show preliminary plans and to receive additional input.

  • As we get closer and the dates are set, we will post the dates on this website, send out emails to those who sign up for notifications (see link in footer), and postcards to the surrounding residents.

  • If you have any questions, please email us at


The U.S. Environmental Protection Agency (EPA) announced a $281 million Water Infrastructure Finance and Innovation Act (WIFIA) loan to Johnson County, Kansas to support the Nelson Wastewater Treatment Facility Improvements Project. Through this WIFIA loan, EPA is supporting the modernization of critical wastewater facilities to address aged and deteriorating Infrastructure and to comply with new regulatory requirements. Johnson County Wastewater pursued the WIFIA loan because of favorable interest rates and repayment terms, which will help to reduce impacts on future sewer rates.

View Full Press Release