Portland requires annual testing of backflow prevention assemblies on irrigation systems, fire lines, boilers, and certain commercial and multi-family connections, with results filed with the water bureau or the local water provider. Sheltons Construction tests, repairs and installs backflow assemblies across the Portland metro and files the paperwork so the account stays in compliance.
What is backflow testing, exactly?
A backflow preventer is a mechanical assembly — usually a reduced-pressure (RP) or double-check (DC) device — sitting on a line where a pressure drop in the city main could pull water backward out of a building, irrigation system, boiler loop or fire sprinkler line and into the drinking water supply. Testing means hooking a calibrated gauge to the assembly's test cocks and checking that the internal check valves and relief valve hold and release the way they're supposed to. It's a 20 to 40 minute job for a single assembly, done in place, no digging.
If it fails, the assembly gets rebuilt or replaced on the spot when parts allow, then retested. Either way, a certified tester signs a report and it gets submitted to whoever owns the requirement — the City of Portland, or the water provider in Beaverton, Hillsboro, Tigard, Tualatin or wherever the property sits, since several of those cities and water districts run their own cross-connection control program rather than Portland's.
When does someone need this?
- An irrigation system with a backflow preventer at the meter or in a valve box — required on almost every sprinkler system tied to city water
- A commercial building, apartment building or building with a fire sprinkler system — these almost always carry an annual test requirement tied to the occupancy permit
- A boiler or hydronic heating loop with a backflow assembly on the fill line
- A notice from the water bureau or a property's water provider saying the annual test is due or overdue
- A new assembly that needs installing — new irrigation system, new fire line, a remodel or new construction project that adds a cross-connection
- A closing on a property where the backflow test lapsed and the buyer, seller or lender wants it current
Most residential customers only run into this because of irrigation. Landlords with several properties tend to have a handful of these on staggered due dates, which is its own scheduling problem.
How the visit goes
We confirm the assembly type, size and location ahead of time when possible — meter box, mechanical room, outside wall — since access matters more than anything else for how long the visit takes. On site: shut down and isolate the line per the manufacturer's procedure, connect the test gauge, run the sequence for that assembly type, and read the results. A passing assembly gets a signed test report on the spot. A failing one gets diagnosed right there — usually a worn check valve, a relief valve that won't seat, or debris — and we quote the repair before doing anything, then retest once it's fixed. The signed report gets filed with the correct water provider; we handle that step rather than leaving it to the property owner to track down which portal or fax number applies.
What affects the price
- Assembly type and size — a 3/4-inch DC on a residential irrigation line tests differently than a 2-inch RP on a commercial fire line
- Whether it passes on the first test or needs parts and a retest
- Number of assemblies on one property — a call for one backflow device is priced differently than testing five on a commercial building in one visit
- Access — a buried valve box that needs digging out, or an assembly in a cramped mechanical room, adds time
- Whether the assembly needs winterizing or de-winterizing as part of the visit, common with irrigation systems each spring and fall
We quote before doing repair work, not after.
What's specific to Portland houses and water
Portland's older neighborhoods have a lot of houses where the irrigation system, the backflow preventer and the original plumbing all date to different decades, and it's common to find an assembly that was never registered with the water bureau in the first place, or one installed by a landscaper without a permit. Outside city limits, Beaverton, Hillsboro, Tigard, Tualatin, Lake Oswego and the other water providers in the metro each run their own version of the cross-connection program with their own due dates and reporting method, so "who do I file this with" is a real question and depends on the address, not just the city name on the mail.
Winters here also matter for irrigation backflow assemblies specifically: an above-ground device that isn't properly drained before a cold stretch can crack, which then shows up as a failed test — or a leak — the following spring.
Why Sheltons Construction
Sheltons Construction is a licensed Oregon plumbing contractor working the Portland metro, from emergency calls to planned replacement and remodel work. Backflow testing is part of the same crew and the same phone line that handles water heaters, repiping, remodel plumbing and new construction plumbing — so a landlord or builder with a backflow assembly due for test isn't dealing with a separate specialty outfit, and a homeowner who fails a test and needs a rebuilt assembly can get it fixed the same visit instead of scheduling a return trip.
What to do now
If a notice came due, or an irrigation system needs its spring test, contact us with the address and assembly type if known. For anything urgent — a failed assembly that's actively leaking, or a fire line issue — see emergency plumbing. Landlords or property managers with multiple assemblies on different due dates can set those up together rather than one call at a time.
We test and file backflow assemblies in Portland, Beaverton, Hillsboro, Gresham, Tigard, Tualatin, Lake Oswego, West Linn, Oregon City, Milwaukie, Happy Valley, Clackamas, Wilsonville, Troutdale, Sherwood and Salem.
Questions about permits, scheduling or how testing fits into a larger remodel or new construction project are answered on our FAQ page.