Backflow Assembly Repair in Phoenix

A failed test means one part of the assembly didn't hold the number the procedure requires. It rarely means the whole assembly is junk. The tester's gauge readings point to the part:

• A check valve that won't hold. On a double check, Watts' service manual for its large assemblies lists the causes as debris on the seat, a damaged seat, a damaged clapper or a broken spring.
• An RP relief valve that dumps water. The same manual's troubleshooting table starts with a fouled first check, then a leak in the second check, fluctuating inlet pressure, or a relief valve with a damaged diaphragm or weak spring.
• A shutoff valve that won't close tight. The test needs tight shutoffs to read the checks, so a leaking shutoff can fail a test that the checks would have passed.

The gauge readings narrow it down. Watts' RP guide reads a steady 4 to 7 psid across the first check as a relief valve problem, 2 to 3 psid as a leaking check, and a fluctuating reading as unstable inlet pressure. That's why we read the numbers before we open anything. If your RP is discharging between tests, see why an RPZ spits water.

Valley cities are strict about who touches the inside of an assembly.

• Phoenix requires a certified repairer working to ASSE Standard 5130 (City Code 37-143). Phoenix also asks test companies on its list to file both a tester certificate and a repairer certificate.
• Scottsdale limits installation, testing, maintenance, repair and replacement to individuals certified and approved by an agency the city recognizes (Revised Code 49-65(d)).
• Mesa says anyone doing backflow maintenance and testing in the city must be a recognized tester (City Code 8-1-12).

A handyman with a repair kit doesn't meet any of those. Neither does a tester who isn't on that city's list.

Late is expensive. Phoenix can add a civil penalty of up to 1,000 percent of water charges per billing period under City Code 37-146, and shut water off after ten days' written notice. Our FAQ on a failed backflow test covers the notices step by step.

Repair is the default. Check rubber, springs, seats and relief valve parts are all serviceable on most commercial assemblies, and the Watts manual walks through replacing seats and relief valve parts in the field. Replacement makes sense when parts for an old model aren't available, the body is damaged, or the assembly is the wrong type for the hazard. Then it's a backflow assembly replacement.

The permit question differs by city. Phoenix's building code exempts repair or replacement of existing secondary assemblies 2 inches and smaller from a permit, as long as a certified tester's report goes to the city at the time of the work. Gilbert requires a permit when a failed assembly can't be repaired and is replaced. So a repair usually skips the permit counter. A replacement often doesn't.

HQ repairs leaking and failed domestic backflow assemblies, retests them and files the passing report with the city. A failed test followed by a repair and retest is cheapest in downtime when it happens on one visit, so tell us the shutoff limits ahead of time. Phoenix's form asks for the part numbers on the report. Fire backflow assemblies and fire sprinkler work are outside what HQ does.

If the city's deadline is close, tell us the date when you call. We offer 24/7 emergency service for an assembly that's flooding the planter, and an upfront price before work starts. Related: commercial backflow testing, commercial plumbing, emergency plumber and property management plumbing.