Preparing Your Backflow System for Seasonal Changes

You know that backflow testing is an annual thing—but what do you have to do to prepare your system against seasonal changes?

Temperature shifts, pressure changes, and environmental factors can all impact the performance of your backflow prevention system. Cold weather can cause freezing and cracks, while warmer months may lead to pressure fluctuations that put extra strain on the system. 

And if your backflow preventer isn’t in good shape, it might not do its job when you need it most.

In this guide, we’ll go over why backflow testing is necessary, how to spot issues, and what steps you should take to keep your system working year-round.

Is Backflow Testing Necessary?

The short answer is yes.

And it's not just necessary. It's also required by law in San Diego. The Public Utilities Department has put strict laws in place to ensure that the public water supply is always safe. This includes preventing contaminated water from flowing backward into clean drinking water—something that happens when there's a sudden change in water pressure.

This is in addition to the Safe Drinking Water Act that's implemented nationwide, the California Plumbing Code, and Title 17 of the California Code of Regulations. All these require properties and homeowners with potential cross-connections to secure an approved backflow prevention assembly. Not only that, but it should also be tested annually by a certified professional like Adam and Jen from San Diego Backflow Testing. Property owners will then need to submit proof of compliance for this.

Who Needs Backflow Testing?

San Diego regulations require that all properties with a 1.5-inch or larger water meter, including multi-family homes, commercial buildings, and irrigation systems, have a backflow prevention assembly. 

These assemblies are also mandatory for facilities with high-risk plumbing connections, such as:

• Fire sprinkler systems

• Irrigation or lawn sprinkler systems

• Industrial equipment

• Restaurants and food processing facilities

• Medical offices and laboratories

  
  

If the Public Utilities Department determines a property needs a backflow device, owners will receive a notification requiring installation. Failure to install, maintain, or test the device can result in fines or even water service termination until compliance is met.

How Do I Know If My Backflow Is Bad?

A failing backflow prevention system isn’t always obvious at first, but certain warning signs indicate that something is wrong. 

Here are some clear indicators that your backflow preventer may need repairs or replacement:

Sudden Drops or Fluctuations in Water Pressure

If your water pressure suddenly weakens or varies throughout the day, it could mean your backflow preventer is clogged, leaking, or failing. 

Leaks Around the Backflow Device

Pooling water, moisture buildup, or visible corrosion around the device are signs of wear and tear. Gaskets, seals, and valves can degrade over time, causing leaks that reduce the effectiveness of your system.

Discolored or Foul-Smelling Water

If your water appears cloudy, brown, or has a strange smell, contamination could already be happening. A failing backflow preventer may allow dirty water, rust, or even sewage to mix with your clean water supply. 

Unusual Taste in Your Water

A metallic, chemical, or otherwise odd taste in your tap water could be another indicator of contamination.

Frequent Plumbing Issues 

Clogged pipes, slow drainage, and unexplained backups may be caused by a failing backflow preventer. If water is not flowing properly in your system, pressure imbalances can occur, which may cause water to move in the wrong direction.

How Do I Prepare a Backflow System for Seasonal Changes?

Backflow prevention systems are affected by weather and seasonal shifts, which can cause pressure fluctuations, freezing, and mechanical wear. Preparing for seasonal changes helps extend the life of your system, prevents malfunctions, and keeps your water supply protected. 

Here’s how to prepare your system for different times of the year:

Winter Preparation

Cold temperatures can freeze the water inside a backflow preventer, causing internal components to crack or break. If your device is located outdoors, here's what you can do to prevent freeze damage:

• Insulate the backflow preventer. Use an insulated cover, heat wrap, or foam pipe insulation to shield the system from freezing temperatures.

• Drain and shut off unused systems. If you have an irrigation system or seasonal water supply, shut off the water supply and drain any remaining water before winter.

• Keep the water flowing. If freezing is a concern, leaving a slight trickle of water flowing through pipes during extreme cold can help prevent ice buildup.

  
  

Spring and Summer Maintenance

As temperatures rise, water usage typically increases for irrigation, pools, and cooling systems. This added strain can cause backflow preventers to work harder, which may lead to failures if the system isn’t in good condition.

• Inspect for leaks and wear. Look for signs of corrosion, worn-out seals, and any loose fittings around the device.

• Check water pressure. Seasonal water use can affect pressure levels, so test your system to ensure it's functioning correctly.

• Clear debris around the device. Dirt, leaves, and plant growth can block airflow and affect the system’s ability to operate properly.

  
  

General Year-Round Maintenance Tips

Regardless of the season, regular maintenance keeps your backflow prevention system in top shape:

• Test annually. Schedule professional testing to catch problems before they turn into costly repairs or health risks.

• Monitor for pressure changes. Sudden drops in pressure can indicate a failure or blockage in the system.

• Replace old or worn parts. Components like valves and seals degrade over time. Replacing them before they fail helps maintain protection.

  
  

Winterization in Other Regions

San Diego's mild climate means residents typically don't face severe winter conditions. Freezing temperatures, ice damage, and extensive winterization aren't that much of a common concern. 

In colder regions, such as the Midwest and Northeast, winterizing backflow preventers are ideal due to frequent sub-freezing temperatures. Property owners in these areas must:

• Fully drain backflow assemblies to prevent water from freezing and cracking internal components.

• Use insulated or heated covers to shield outdoor devices from severe weather.

• Conduct frequent inspections throughout winter to promptly address potential issues.

  
  

San Diego property owners enjoy relatively stress-free winters, but annual testing and routine maintenance are still legally required to ensure your backflow system performs reliably during temperature fluctuations and increased seasonal usage.

What Happens If You Don’t Do Backflow Testing?

San Diego has stepped up enforcement, so skipping your annual backflow test can lead to penalties and potential water shutoffs. The city sends reminders before taking action, but if testing isn’t done, water service may be disconnected. Even if the city does not suffer that much during colder months, it should still be in your best interests to ensure that you get certified properly. After all, everyone's health is on the line!

Don’t Risk Fines or Contaminated Water—Schedule Your Backflow Test Today!

Seasonal changes can put extra stress on your backflow prevention system, and skipping your annual test can lead to serious consequences. With San Diego cracking down on enforcement, missing a test deadline could mean costly fines or even a water shutoff.

At San Diego Backflow Testing, we take the hassle out of compliance. As a licensed, bonded, and insured family-owned business, we handle everything from testing and repairs to installation—without any middlemen. When you call, you’ll speak directly to Adam or Jen, and we’ll take care of the paperwork for you, submitting results to the water district on your behalf.

Stay ahead of seasonal changes and avoid penalties! Upload your test form now to schedule your backflow test, or call us today at 877-363-8378!