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the DNR's EIS for the proposed city of Waukesha water diversion [PDF].
to the Great Lakes Council decision on the proposed City of Waukesha water diversion [PDF exit DNR].
a summary of the City of Waukesha's preapplication for WIFIA loan funding [PDF exit DNR].

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Contact information
For information on the DNR's review of this project, contact:
Ben Callan

City of Waukesha water diversion

Notice: Public Informational Hearing and Public Comment Period on proposed reissuance of the Wisconsin Pollutant Discharge Elimination System permit for the City of Waukesha

The DNR has scheduled a public informational hearing on the proposed permit, where members of the public can submit written or oral comments on the WPDES permit. The proposed permit and supporting documents are available at the WPDES Permits on public notice webpage.

The hearing is scheduled for October 17, 2019, 3:00 pm at the Waukesha DNR Service Center, 141 NW Barstow St., Room 151, Waukesha Wisconsin.

Written comments may also be submitted until October 24, 2019 to Laura Dietrich, 141 NW Barstow St, Room 180, Waukesha, WI, 53188, 262-574-2159, >

The City of Waukesha has long relied on a deep aquifer groundwater supply, but depressed water levels in the deep aquifer have compounded high radium concentration levels, requiring costly treatment. The City is under an amended court order to comply with radium standards by September 1, 2023.

Waukesha sought an exception from the prohibition of diversions under the Great Lakes – St. Lawrence River Basin Water Resources Compact (Compact) and the Great Lakes – St. Lawrence River Basin Sustainable Water Resources Agreement as a “Community in a Straddling County.” The City submitted an application for use of Lake Michigan water to the DNR in 2010, and an updated application in 2013.

Following the DNR's technical review and preliminary final environmental impact statement analysis, the City of Waukesha's Great Lakes Diversion Application was approved by the Compact Council in June 2016 with conditions that included:

The Great Lakes and St. Lawrence Cities Initiative requested a hearing from the Compact Council on the Waukesha diversion approval in August 2016. The Council reviewed the petition and in April 2017 voted to not open the Waukesha Diversion Decision for reconsideration.


Waukesha has begun the process to obtain all required federal, state and local permits and approvals necessary to construct and operate a diversion of Lake Michigan water. Waukesha plans to obtain Lake Michigan water from the City of Milwaukee and discharge treated wastewater to the Root River.

Prior to the issuance of permits (other than the the Clean Water Plant Facility Amendment approval) for a final diversion approval, the DNR must make publicly available an environmental impact status (EIS) and a Wisconsin Environmental Policy Act (WEPA) Compliance Determination. The EIS will include updated information on the current proposed project. Waukesha submitted to the DNR a supplemental environmental impact report (EIR) and other EIR-related information in 2018 and 2019. The DNR will use the updated EIR information in the development of the EIS. The EIS has not yet been completed as of May 2019.

As of May 2019, the DNR has received and is reviewing applications from the City of Waukesha for a Wisconsin Pollutant Discharge Elimination System (WPDES) Permit and for a Waterway and Wetland Permit. The DNR recently approved the Clean Water Plant Facility Amendment (see Permits review).

The DNR will issue a final diversion approval once all required permits are issued. The final diversion approval will include all conditions of the approval required by the Compact Council. Construction completion and beginning of operation is currently planned for 2023.

Last revised: Wednesday September 25 2019