Guides for owners, managers and supers
Short, sourced explainers about Durham Region's backflow program. Written for the person holding the notice, not for plumbers.
The notice cycle
What the letter from the Region means, what BSI Online is, what the tag on the device means.
BSI Online and Durham Region: How the Reporting Portal Works From the Owner's Side
BSI Online administers Durham's backflow program: notices, tester registration, report submission, the $25 fee. What an owner needs to know and what you do not need to do yourself.
Aug 17, 2026Backflow Test Tags Explained: What the Tag on Your Device Means
The tag on a backflow preventer is required by Durham's by-law and carries specific fields. What each means, what a tag does not prove, and how it relates to the report and the Region's record.
Aug 17, 2026
Devices
Finding your backflow preventer, telling the types apart, why they fail.
Why Backflow Preventers Fail (and Why Hard Water Makes It Worse)
The failure modes behind most failed tests: fouled checks, worn rubber, weak springs, stuck air inlets, weeping relief valves, freeze damage. Which devices get which, and what scale does.
Aug 6, 2026How to Find Your Backflow Preventer (and Tell Which Type You Have)
Where the device usually is in a Durham commercial or multi-residential building, what it looks like, how to read the plate and tag, and how to tell a DCVA from an RPZ from a PVB.
Jul 29, 2026
Rather just have it handled?
Send us the address and the notice. We book, test, tag, and file.