How long does a backflow test take, and what actually happens?
If you've never had one done, here's the reassuring truth: a backflow test is one of the least disruptive service visits your house will ever get. Plan for 15–30 minutes, a brief water shutoff at the assembly, and in most cases you don't even need to be home.
The play-by-play
- The tester finds the assembly — usually where the irrigation line meets the water supply. If you can point them to it (or send a photo when you book), the visit goes faster.
- Water to the assembly is shut off briefly. For an irrigation assembly this typically doesn't affect water inside the house at all. For assemblies on the main line, expect a few minutes without water.
- Gauges go on.The tester connects a calibrated test kit to the assembly's test cocks and measures whether the check valves and relief valve hold pressure the way they're supposed to.
- Pass or fail.Most assemblies pass. If yours doesn't, here's what happens next.
- The tester files the report with your water provider — you keep a copy for your records. More on how report submission works.
How to make it even easier
- Clear access to the assembly — unlock gates, move anything stacked on the valve box.
- Have your notice letter (and its sticker labels) ready for the tester.
- Ask about drop-in vs. scheduled pricing when you book — some testers charge less if they can come anytime that week.
Wondering about the bill? See what backflow testing costs in Portland.