Backflow Testing Guide and Irrigation Systems Information

The following guides provide information regarding irrigation systems and backflow prevention devices. All irrigation systems must obtain a permit prior to installation and all backflow preventers must be inspected annually by June 1. For a complete listing of certified backflow testers, please visit the State of Missouri Department of Natural Resource website.

All lawn irrigation systems, fire sprinkler systems and commercial service lines are required to contain a backflow prevention device and be tested annually by a State of Missouri certified tester. Annual backflow test reports are due by June 1. The City of Wentzville has implemented a  fee structure pertaining to backflow reporting. The fee structure is as follows:

Water Backflow Filing Fee

Received Date

Fee

Early Bird

Prior to June 1

$5.00

Standard

June 2 thru July 1

$10.00

Late Filing

After July 2

$25.00

 

Please be aware that the test date will not override the date of receipt at our office. Each report is stamped the date it is received by our office. This received date is what will determine the fee that your customer will be charged on their water account with the City of Wentzville.

Additional changes this year include a new fax number for submitting test results as well as a limit on email. Only one PDF per email will be accepted. You are welcome to scan multiple reports into ONE PDF but please do not attach more than one PDF per email. There are four options for submitting your test results:

  • Email backflow report to Backflow.Test@wentzvillemo.org (Recommended)
  • Fax backflow report to (636) 639-2029 (NEW Fax Number)
  • Deliver backflow report in person to the City of Wentzville
  • Mail backflow report to:    

                                 City of Wentzville
                                 Attn: Backflow Reporting   
                                 1001 Schroeder Creek Blvd.
                                 Wentzville, MO 63385

All reports submitted by email will receive a confirmation receipt by email. If the report is submitted through fax or mail, it is recommended to confirm the City's receipt of the report. Receipt of reports can be confirmed by the City of Wentzville by calling (636) 639-2165.

In lieu of testing, lawn irrigation systems may be de-activated by removing their backflow device. Please schedule a de-activation inspection by the City's Water Division before June 1. The fee for a de-activation inspection is $30.

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