What Happens If My Device Fails?

A failed backflow test is not a disaster, but it is not something to ignore either. When a tester files a failure report with your water district, a clock starts ticking. The good news is that most failures are straightforward to fix. The bad news is that delaying the repair can lead to penalties, service restrictions, or repeated testing costs.

Why Devices Fail

• Worn rubber seals: Check valves and relief valves use rubber seals that degrade over time. This is the most common failure.
• Debris and sediment: Dirt, scale, or rust can prevent the valve from sealing fully.
• Improper installation: A device installed at the wrong height or orientation may not function correctly.
• Freeze damage: Devices exposed to cold weather can crack or warp. This is less common in the South Bay but still happens during cold snaps.
• Age: Most devices last 15 to 25 years with proper maintenance. Older devices are more likely to fail.

What Happens After a Failure

The tester will submit a failure report to the water district along with your test results. The district will notify you, usually by mail or email, and set a deadline for repair. In most South Bay districts, you have 30 days to repair the device and pass a retest. If you cannot meet the deadline, contact the district before it expires. Many districts offer a one-time extension if you provide a reasonable explanation and a repair date.

Repair vs. Replacement

Most failures can be repaired by replacing the internal seals, springs, or check valves. A typical repair costs between $150 and $400, depending on the device type and the parts needed. If the device is severely corroded, cracked, or more than 20 years old, replacement may be more cost-effective. A new residential device costs $400 to $800 installed, while commercial devices can run $1,000 to $2,500 depending on size and type.

How to Avoid Future Failures

• Annual testing: Even if the device passes, annual testing catches small issues before they become failures.
• Winter protection: In unheated areas, insulate the device or install a heated enclosure.
• Clean surroundings: Keep the device free of dirt, leaves, and debris that can enter the valve ports.
• Use quality parts: If repairs are needed, insist on factory-approved parts. Cheap aftermarket seals often fail within a year.
• Document everything: Keep copies of every test and repair report. This helps identify patterns and may be required if you sell the property.

Bottom Line

A failed backflow test is a maintenance issue, not an emergency. Repair it promptly, use a certified technician, and keep the paperwork. The repair cost is usually modest, and the retest is quick. Treat it as a routine part of property maintenance, and you will avoid any compliance issues down the road.