The first sewers and a basic wastewater treatment plant was first installed in 1921. The treatment plant was later upgraded and expanded in 1951 to handle meet the needs of the growing community. The plant was rebuilt in 1981, providing the Village with then state-of-the-art treatment and expanded capacity. Since then, additional upgrades allowed the facility to meet additional treatment requirements. Today, the treatment plant can treat an average flow of 1.5 million gallons per day, with a peak flow of 3.75 million gallons per day. The treatment plant continues to be improved, for better efficiency and control the long-term wastewater treatment costs. The initial plan was to perform another major upgrade in 2010. However, the strained economy made this an unacceptable option. Under the new utility organization, the staff has replaced inefficient equipment as it fails. The Village can buy the equipment at a lower cost and use existing staff whenever possible to install it.
Sanitary Sewer System

The wastewater flows from homes, businesses, and industries through a series of sewers located throughout the Village. The sewers are designed to carry the wastewater from all of these places to the Village’s wastewater treatment plant. Wastewater generally flows through the sewers by gravity. The slope of the pipes allows this efficient process to convey the wastewater to the treatment plant. When gravity flow will not work, the Village has lift stations that pump the wastewater to a point in the gravity sewers where the wastewater will flow by gravity again. The Village’s utility staff began to clean the sanitary sewers in 2010, as part of the effort to control utility costs. Prior to that time, contractors had been used to perform the sewer cleaning. The sewers are sized to carry the wastewater, not rain water or ground water. The “clear water” can come from building drain tiles, sump pumps discharging to the sewer, or even some roof drains that might be connected to the sewer.

Clear Water Control

The Village residents can help to control a major element of rising utility costs. The clear water flowing into the sewers can cause sewer back-ups and/or flows that would exceed the treatment plant’s capacity. Those conditions could lead the the State mandating plant upgrades or sewer upgrades to prevent those problems. Those upgrades are expensive and preventable. You can help:

  • Make sure that your sump pump discharges outside, rather than into your basement sewer drain.
  • Turn-off the water in your house, when you don’t need it running. This saves you money AND helps to control flow to the treatment plant.
Future Projects

Grand Ave. Project
Scope of work – Excavate 3 spot repair, Reline 1100′ of failing 8″ clay tile sewer between Oakland Ave and Division Str. The project has been awarded to Advance Construction but start dates and completion dates are yet to be set.

Oakland Ave. Project
Scope of work – Reline 370′ of failing 10″ clay tile sewer between Division Str. and Clarendon Ave. The project has been awarded to Advance Construction but start and completion dates a re yet to be set.

Crestview Drive Easement Project
Relay 170′ of sagging sanitary sewer that is causing backup problems and constant maintenance.

TIO #5 Industrial Park Development
Scope of work – Installation of approx. 4,700′ of 12″ gravity sanitary sewer, project area is south of the Intersection of Maple Crt on Maple Ave. and south of Wolf Run Drive on Hwy 83 primarily in easements off of the State R.O.W. Project is currently out to bids being bid awarded the beginning of May and start of construction to be approx. in the beginning of June and substantial completion by December 31, 2018

Wastewater Treatment Facility Upgrades
The WWTF was built in 1981 with an useful life expectancy of 20 years. THe plant is now on its 37th year of operation with approx .. 40% capacity left and is in good repair but needs some maintenance upgrades due to the age of some failing components. The needed upgrades are Digester Rehabilitation, and the Grit System Rehabilitation, A septage receiving station is being built to accept septage and to help offset some of the upgrade and construction costs. The work is scheduled to begin in 2018 at this time.


Hours of Operation
Monday – Friday
7:00 am to 3:30 pm

Water Department &
Sewer Department

Contact Information

Wastewater Treatment Facility

1200 Holz Parkway
Mukwonago, Wisconsin 53149

(262) 363-6416
(262) 363-0552 Fax

Utility Billing
Contact Information
(262) 363-6420, Ext. 2118

Dave Brown
Utility Director
Cell Phone: 414-550-2509

Wayne Castle
Assistant Utility Director
Cell Phone: 262-441-1366

Jim Smith
Utility Operator
Cell Phone: 262-336-5705

Matthew Kinder
Utility Operator
Cell Phone: 262-336-5934

Ken Miller
Utility Operator
Cell Phone: 414-550-8738

Jayme Sukowaty
Utility Operator
Cell Phone: 262-442-0940

Open Position
Utility Operator