Backflow & Cross Connection Service Testing

Backflow assemblies allow potable water to move in only one direction to the point of delivery, preventing contaminated water from re-entering our drinking water.

I am a property owner - do I have to get my backflow assembly tested?

  • All property owners who have a backflow assembly must have it tested annually per regulations
  • You must test your backflow assemblies using only a registered Hillsborough County certified tester
  • View the registered Hillsborough County certified testers list

What if the test fails?

Property owners

  • You are responsible for repairing or replacing any backflow preventers that fail to meet performance standards
  • Contact the Cross-Connection Control Unit if you have any questions regarding the requirements for the repair or replacement of your backflow preventer

Certified testers

  • You must notify the County within 48 hours of any backflow preventer assembly that fails a test

I am a certified tester - where are the forms I need?

If you are a certified tester you can use our online form to submit your test results electronically, or you can download a PDF version of the form.

Submit Online Backflow Test Form

Download Backflow Test Form - PDF

  • If you have any issues viewing the PDF form in a Chrome or Firefox browser, either use an Internet Explorer browser or download the form and open it up with a PDF viewer, such as Adobe Acrobat Reader.
  • If you use the PDF form, submit test and maintenance results by one of the following methods:
  • Email
  • Fax: (813) 635-1612
  • Mail:
    Cross-Connection Control Unit
    Hillsborough County Public Utilities
    P.O. Box 89547
    Tampa, FL 33689-040


For more information, please contact our Public Utilities department at (813) 272-6680 or email the Cross-Connection Control Unit.