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Backflow Assembly Testing

Commercial & Residential Backflow Testing

Backflow is the reversal of the normal direction of water flow, which could result in undesirable materials entering the potable water supply. To ensure that safe, clean water is being distributed to all customers, the City of Troy requires that every commercial and residential property install and routinely test their backflow prevention device(s). These backflow preventers are mechanical devices and are subject to failure from wear and tear, corrosion, freezing, water conditions, and misuse. Testing these devices ensures that they are operating as required to prevent the backflow of contaminants into the municipal water supply.

Commercial Backflow Testing
Backflow testing on commercial properties is required once a year and must be completed by a licensed plumber with ASSE backflow tester certification. Questions regarding commercial backflow testing can be directed to the Cross Connection Inspector, Justin Kilburn, at 248.524.3398 or Justin.Kilburn@troymi.gov.

Residential Backflow Testing
Backflow testing for residential properties is required every three years according to the corresponding water billing district. Each water billing district is assigned a specific year for testing. The testing must be completed by a licensed plumber with an ASSE backflow tester certification. The Water & Sewer Department will remind residents via mail based on their water billing district when it is time to complete their testing. Testers must submit all backflow tests to the City of Troy Swift Comply program at troymi.c3swift.com/. Questions regarding residential backflow testing can be directed to 248.619.7266 or backflowtesting@troymi.gov

Swift Comply
All backflow assembly test reports must be submitted by the tester to the City of Troy Swift Comply program. City of Troy testing reminder includes a section for testing notes and a list of known backflow assemblies at the testing address. If you wish to use a full test sheet, please click here for a blank form than can be printed. Registration must be completed before reports can be submitted. Please fill out the registration form and submit to  Justin.Kilburn@troymi.gov along with separate PDF files containing:

- Plumbing license
- ASSE Certification card
- Calibration sheets for gauges to be used 

All tests must be performed by an ASSE certified licensed plumber or an ASSE certified plumbing apprentice under direct supervision of a licensed plumbed. Please keep in mind all testers will need an individual email address to register on Swift Comply.
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