Preventing contaminated water from re-entering our drinking water

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.

Property owners

Common questions you may have about testing.

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?

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

Certified testers

If you are a certified tester you can use our online form to easily submit your test results instantly. You must notify the County within 48 hours of any backflow preventer assembly that fails a test.

Online submissions - preferred method

Submit Online Backflow Test Form

Alternate method

You can download the fillable* PDF version of the form and fax, mail, or scan and email the results in:

Scan and email to

Mail to:
Cross-Connection Control Unit
Water Resources
P.O. Box 89547
Tampa, FL 33689


For more information, please contact our Water Resources department at (813) 272-6680 or email

Last Modified: 4/23/2024, 8:00:29 PM

Was this page helpful?