What a failed backflow test means

A failed backflow test means the assembly did not meet the pass criteria the tester is required to use. It does not mean the drinking water in the main has already been proven contaminated. It means the mechanical protection the water supplier is counting on did not check out, so the assembly has to be repaired or replaced and tested again. This guide does not describe how to open the assembly or how to run the gauge.

The report is the result

The tester should give you a written result and, where the rule requires it, send the same result to the water supplier. Idaho’s board rules say a passing field test is reported to the consumer and the public water system within fifteen business days, and a failing test within two business days. Mississippi says the Certified Tester gives the property owner and the public water system a report on a Department form, and both the tester and the system keep it at least five years. Connecticut’s survey instructions say a malfunctioning device shall be promptly restored to proper operating condition by the customer of the public water system.

Read the report for the assembly type, the failure, and the date. Keep the copy. If the water supplier has an online portal, ask whether the tester or you must upload it. A verbal “it failed” without a report leaves the supplier’s file unchanged.

Clocks are short

Massachusetts says a device that fails or is found defective shall be overhauled, repaired, or replaced and retested within 14 calendar days. Repair work must be done by a plumber licensed by the Commonwealth to the extent the plumbing rules require. On a fire system, repair or replacement also needs approval from the head of the local fire department.

Mississippi gives 30 days to repair or replace a failed reduced-pressure assembly or pressure vacuum breaker, and 90 days for a failed double check. The clock starts when the failure is identified. Wyoming’s Chapter 12 text says a defective device shall be repaired or replaced immediately, and that failure to make the repair is cause for the service connection to be terminated.

Those are different clocks. Use the one your water supplier cites. Do not assume the longest example applies to you.

The water can be shut off

Alabama’s cross-connection rule says the supplier shall deny or discontinue service if a required device is not installed or properly maintained, and service stays off until the supplier and the Department are satisfied. Delaware’s Office of Drinking Water guidance says the system may discontinue service until a cross-connection or backflow deficiency is corrected. A failed test that is ignored can become a shutoff. That is the supplier protecting the main, not a penalty invented by the tester.

Michigan notes that the customer often pays for installation and testing. Repair is a separate bill. Ask for it in writing. In some states the person who may test is not the person who may repair. Ohio’s isolation-device certification covers install, test, and repair of isolation devices, and it does not cover containment devices. Utah says a tester certification is required to test, and that repair or installation may require another professional license. Texas allows a licensed tester to repair ordinary assemblies, with the fire-line employment limit described on the license page.

What to do next

Tell the water supplier you have a failed result and ask what date they will treat as the deadline. Hire someone allowed to repair that type of assembly, then schedule the retest with someone allowed to test. If the assembly cannot be repaired before the deadline, ask whether the supplier wants it isolated. Do not leave a bypass open so the building has water with the protection removed. Oklahoma’s rule requires a diversion line to have equal backflow protection if one is used so a device can be maintained.

If you think the test itself was wrong, ask for a second test by another qualified tester. Do not “fix” the result by learning the gauge procedure from a video. How to verify a tester is how you check the person. Questions to ask before you hire a tester is the list to use for the repair visit as well as the first test.