The firms listed here have been
certified to test backflow preventers.

Important Information For
Backflow Prevention Assembly Testers

Select your region in the drop-down list to filter listings for your local area - or search for a particular firm or city using the Search box.

You must register in our new automated system (HydroSoft) to submit test forms. If you have not registered yet, please click here for detailed information and instructions.

 Find your certified tester by region.

The listing of backflow prevention assembly testing firms is provided as a convenience and is not intended as an endorsement or referral. This is not a complete or comprehensive listing. HydroCorp suggests contacting several backflow prevention assembly testing/plumbing companies before deciding which to use. HydroCorp cannot recommend one testing company over another. You may elect to use a tester not on this list; however that tester/plumber must be certified to test in the appropriate city/state/jurisdiction. HydroCorp assumes no liability for the service or quality of work performed by a listed company/tester/plumber on this page. The companies displayed on this list have no affiliation with HydroCorp or HydroCorp employees.

If you are a plumber/testing company and the information listed above is incorrect, please email for any changes or call 248-250-5026. Listing information is updated monthly.

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