Cross Connection Information

Cross Connection

A cross connection is any temporary or permanent connection between the public water supply and a potentially hazardous water supply on the consumer’s end. Through these types of connections, contaminants can flow from the consumer’s water supply back into the public water supply. Some of the most common ways this can happen are through underground lawn irrigation systems, water driven sump pumps, and fertilizer spray applicators attached to residential hoses.

Avoiding Cross Connections

Backflow prevention devices can be used to help protect our water supply. Through the City’s Code of Ordinances, the Water Department requires that these protection devices be tested on an annual basis. The exception to this is pressure-type vacuum breakers that protect lawn irrigation only; these are to be tested every three years per new State law.

Effective testing of protection devices can detect failures in them. 

Backflow Prevention Device Performance

In 2021, there were 1,817 tests on residential backflow protection devices used by City of Midland water customers. Of these, 74 devices failed. Also, 1,020 tests were conducted on commercial backflow prevention devices. Of these, 48 devices failed. Combined, the failure rate for commercial and residential devices was 4.4 percent.

These numbers show the importance of maintaining a diligent cross connection program. The help of every residential and commercial water customer is needed to maintain a safe water supply.

If you receive a letter notifying you of the need to have your device tested, please have it tested as soon as possible and send the results to the City Water Department at or by mail to PO Box 1647 Midland, MI 48641-1647 or via fax to 989-835-2717. 

Backflow Testers

A list of certified residential backflow testers can be found here. 

Backflow Device Test Report

The Backflow Webtest Portal allows authorized backflow device testers to submit test results directly to the City's Water Department. Those completing the tests must be ASSE Certified and have a current gauge calibration certificate for their test kit on file with the City. If you are a certified tester, please contact the City's Water Department to be given authorization to the webtest portal at or (989)837-3341.