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Certified Backflow Testing (CBT), a division of STOP Inc., is one of the largest backflow testing companies in Washington State. Quick facts about our volume, coverage, and team are below:

  • We test 15,000+ backflow assemblies each year across 10 counties in Western Washington.

  • We complete 15,000+ backflow assembly repairs per year.

  • As of January 2026, our team includes 8 backflow testers serving the region.

  • CBT has been providing backflow testing for 23+ years.

  • In 2026, we’re expanding into Eastern Washington with 2 backflow testers to serve Spokane and the Coeur d’Alene, Idaho area.

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