SUN PRAIRIE, (Wis.) — Sun Prairie Utilities has filed an application with the Public Service Commission of Wisconsin (PSC) to increase water rates. The increase is necessary to maintain the reliability of our water distribution system and to cover the costs of our new operations facility on Linnerud Drive.
The total increase in water revenues requested by SPU is $1,867,749, which will result in an estimated overall rate increase of 35.84 percent over SPU’s present revenues, which would be implemented in two steps.
- The proposed Step One increase of $1,487,316 would take effect following the issuance of the Final Decision.
- The proposed Step Two increase would be an additional increase of $380,433 over Step One rates.
- SPU would implement the remaining Step Two increase when the Well No. 10 project, as authorized in docket 5810-CW-109, is completed and placed into service.
If the request is granted, the water bill for an average residential customer with a ⅝-inch meter who uses 600 cubic feet of water per month will increase from $27.74 to $35.81, or 29.09 percent, including the public fire protection charge, after Step One is implemented, and from $35.81 to $37.68, or 5.22 percent, after Step Two is implemented, for a combined increase over current rates of $27.74 to $37.68, or 35.83 percent.
To learn more about Step Two increases, visit the PSC website. Additional information on water-related projects can be found in the annual Water Quality Report on SPU’s website.
The last full water rate case was completed in December 2021 for an overall increase of 20.85%. SPU implemented a simplified water rate increase of 8.00% in January 2024. A simplified rate increase is a process that helps utilities maintain revenue continuity. You can read more about this on the PSC website.
PSC staff will review the application, make any adjustments to the revenue requirement, hold a public hearing, and issue their final decision before the new rates are implemented.
The public hearing on the application has been scheduled for Monday, October 13, 2025, at 11:00 a.m. Parties and PSC Commission staff appear by Zoom. Parties and PSC Commission staff may use the telephone connection as a backup or if no adequate internet connection exists. Members of the public participate by Zoom or may use the telephone connection as a backup or if no adequate internet connection exists.
Sun Prairie Utilities
Commission Room
125 West Main Street
Sun Prairie, WI 53590
Or join Zoom over the internet at: https://us02web.zoom.us/my/pschearings
The PSC Commission intends to livestream and record this hearing on YouTube. A member of the public may observe without participation any hearing session by:
- Attending any physical location as noticed,
- Watching on YouTube at: https://www.youtube.com/@PSCWI-Hearings,
- If no adequate internet connection exists, listening by telephone.
- Dial: +1 312 626 6799
- Enter Meeting ID: 809 513 2930
A person may testify in this proceeding without becoming a party and without attorney representation. A person may submit this testimony in only one of the following ways:
- Web Comment. File a comment on the internet. Go to the PSC Commission’s website at http://psc.wi.gov, click the dropdown menu labeled “Commission Action”. Select the item labeled “File a Public Comment”. On the next page, select the “File a comment” link that appears for docket number 5810-WR-107. Web comments shall be received no later than Wednesday, October 15, 2025.
- Live Comment. Make a live comment at the hearing. The Administrative Law Judge (ALJ) may receive live comments from any member of the public in attendance after the close of any party and PSC Commission staff testimony. The ALJ will receive such comments by stating the name of each member of the public connected to the hearing one at a time, and asking if they would like to comment.
- Mail Comment. Send a comment by U.S. Mail. All comments submitted by U.S. Mail shall be received no later than Wednesday, October 15, 2025, and shall be addressed to: Attn: Docket 5810-WR-107 Comments, Public Service Commission, P.O. Box 7854, Madison, WI 53707-7854.
All documents in this docket are filed on the PSC Commission’s Electronic Records Filing (ERF) system. To view the Application, please visit the PSC website at https://psc.wi.gov, select “eServices” from the top menu, then “Docket Search”, and enter PSC Case # of 5810-WR-107.
If you have any questions, please call SPU staff at (608) 837 - 5500.
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Published 07/2025 Updated 09/2025