This randomly ordered list is for convenience only to customers inquiring on a Certified Backflow Tester / Testing Company.
This list provides names and contact information of companies that have previously submitted test reports in the District and are currently registered with BSI Online. Many other Washington State Certified testers and companies in the area can provide the services required for compliance. These testers and companies must register with BSI Online before submitting test reports for compliance. See Tester Information for instructions. The District does not recommend nor endorse any specific company or tester over another.