Current Projects: Northeast Interceptor-Waunakee Extension Capacity Improvements

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Project Overview

This project will provide additional capacity to the Northeast Interceptor system in order to convey projected flows from the villages of Dane and Waunakee and the Town of Westport. The improvements consist of the installation of approximately 18,600 feet of new sewer that will be installed parallel to or replace the District’s existing sewer that extends from the Yahara River to the Village of Waunakee. At this time, construction of the first phase is tentatively scheduled for 2024. 


An interceptor is a sewer pipe that receives wastewater from smaller local sewer pipes that serve neighborhoods or municipalities. Interceptors are the largest pipes in the sewage system and convey wastewater by gravity to pump stations or treatment facilities.


Continued high growth rates in the Village of Waunakee and Town of Westport are expected to create a need for the District to add capacity to the Waunakee Extension of the Northeast Interceptor. The Capital Area Regional Planning Commission is projecting that capacity will be reached in several segments of the Waunakee Extension by or about 2022, based on population forecasts. Periodic flow monitoring performed by District staff as part of the billing program validates these projections.

Public Involvement

The District will hold public information meetings for this project.

Meeting #1: January 17, 2023, 5:30-6:30 pm

  • Virtual public information session.
  • The intent of this meeting is to share background on the project and potential route alternates
  • Link to recording of public information meeting

Meeting #2: Early Fall, 2023

Project details

Project Type:

Capacity Improvements


Yahara River to Village of Waunakee, Town of Westport and Village of Waunakee


Bidding: 2023

Phase 1: 2024

Phase 2: TBD (2030s)

Phase 3: TBD (2040s)



Project Contact:

Aaron McFarlin

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