When the temperatures take a sudden dive, most homeowners remember to grab a coat, but many forget the most vulnerable part of their plumbing system: the backflow preventer.

At Pacific Lawn Sprinklers, we’ve seen it happen across the country. A sudden cold snap turns a functioning irrigation system into a costly, watery mess. Here is why you cannot afford to ignore your backflow device when the thermometer hits the freezing mark.

1. The "Ice Bomb" Effect

Water expands when it freezes. Because your backflow preventer is located outside, it is the first component to feel the bite of the frost. When water freezes inside the brass or plastic internal components:

• Metal Cracks: Even heavy-duty brass can split under the immense pressure of expanding ice.
• Seal Failure: Rubber gaskets and internal springs can warp or snap, rendering the device useless.

2. Contamination Risks

The backflow preventer has one vital job: keeping "non-potable" irrigation water from flowing backward into your home's clean drinking water. If the internal check valves are damaged by ice, they may fail to close properly. This creates a risk of lawn chemicals or bacteria entering your kitchen sink or shower once the system is pressurized again.

3. The "Hidden" Flood

A frozen backflow doesn't always leak immediately. Often, the damage stays hidden until the ice thaws. Once it melts, a cracked body or shattered internal part can lead to a high-pressure geyser in your yard, resulting in:

• Extremely high water bills.
• Potential basement flooding or foundation damage.
• Costly emergency repairs.

Why a Professional Inspection is Essential

Even if you don't see water spraying into the air, the internal integrity of the device may be compromised. A certified backflow test is the only way to ensure the internal components are still moving freely and seating tightly.

Pacific Pro-Tip: If you suspect your backflow has frozen, shut off the dedicated irrigation water valve (usually located in your basement, crawlspace, or a protected valve box) immediately and give us a call.

Protect Your Property Today

Don't wait for a puddle to tell you there's a problem. Our team is currently performing inspections and "freeze-recovery" checks to ensure your system remains safe and functional.

[Click here to schedule your Backflow Inspection]