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Water Utility

Cross Connection Control

The Manitowoc Public Utilities Cross Connection Control Program is designed to prevent backflow or backsiphonage of contaminated water into the drinking water supply. The MPU program has been around for many years, but has recently been updated in response to changes in State regulations in an effort to better protect potable (drinking) water systems from potential contamination. This program is run in accordance with the Wisconsin Department of Natural Resources (WDNR) and NR810.15 of the Wisconsin Administrative Code. MPU is required to report to the WDNR annually on the status of testing and inspecting cross connections at the businesses and homes that we serve.

Current Projects

View our current undertakings for 2023. Contact Rob Michaelson, MPU Water Systems Manager, at 683-4600 for additional information on these projects.

Frequently Asked Questions - UDF

UniDirectional Flushing (UDF) is a method used to clean and improve the carrying capacity of our water distribution system.  This cleaning method helps us continue to provide safe, high-quality drinking water to our customers.

Frozen Water Pipe Prevention

During periods of cold weather and low wind chills, water pipes and water meters can become susceptible to freezing which can lead to broken pipes and water damage if exposed areas aren't properly insulated or heated. Below are some tips to help minimize the chance of freezing water pipes.


Recent news articles have raised awareness, and concern, with PFAS levels prevalent in Wisconsin drinking water. We have prepared a FAQ in an effort to remain transparent and provide information about this substance, as well as share MPU’s testing results. If you have further questions, please call our customer service department at 920-683-4600. 

Water Facilities

The MPU Water Utility has two state-of-the-art water treatment plants, utilizing microfiltration membranes as an absolute physical barrier to pathogenic organisms found in Lake Michigan, such as Cryptosporidium and Giardia.

Water Sampling

MPU conducts water sampling at customer premises throughout the year to comply with the EPA's Lead and Copper Rule.  If you are participating in this program, please see the instructional video below to assist in providing a quality water sample.