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Cross Connections

As a way to maintain a safe and dependable drinking water supply, Sun Prairie Utilities (SPU) practices cross connection investigation and solutions. These inspections are through the Cross Connection Program required by the Wisconsin Department of Natural Resources (WI DNR).

All commercial, industrial, and residential buildings connected to the water supply will be inspected to detect actual and potential cross connections. Inspectors may make recommendations for installing backflow prevention methods or devices wherever necessary.

SPU has contracted with HydroCorp to perform industrial and commercial cross connection inspections. The HydroCorp inspector(s) are trained to perform the necessary inspections and will possess proper identification. HydroCorp personnel will contact SPU customers to set up an appointment.

SPU staff performs residential cross connection inspections during service visits. Staff will need access inside the customer’s home to inspect, so an appointment is necessary. 

What do you need to do?

As a resident of Sun Prairie, you have a responsibility to help protect the community’s public water supply. You can:

  1. Provide the inspector access to your facility/residence during the visit.
  2. Learn more about cross connections on our website (click here) and read our informative brochure (click here) and educational pamphlet (click here).
  3. Become familiar with the cross connection control regulations addressed in the Wisconsin Department of Commerce Admin-Code and the WI DNR website.
  4. Register backflow prevention devices through the Department of Commerce and have them tested annually by a certified tester.

Questions regarding this program or other water quality issues may be directed to Sun Prairie Utilities via email at