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  • Writer's pictureJennifer Johnson

How do I winterize my irrigation system?

As winter approaches, it's time to think about your irrigation system.

The cold can cause serious damage if you're not prepared.


snowy house

Winterizing your irrigation system is a crucial step. It can save you from costly repairs and ensure your system is ready for spring.


This article will guide you through the process. We'll cover everything from identifying your system type to the necessary tools and safety precautions.


Whether you're a homeowner, a garden enthusiast, or a property maintenance professional, you'll find this guide useful.


So, let's dive in and learn how to winterize your irrigation system effectively.


Understanding the Importance of Winterizing Your Irrigation System

Winterizing your irrigation system is not just a routine task. It's a preventive measure that can save you a lot of trouble.


When water freezes, it expands. This can cause pipes, valves, and sprinkler heads to burst.

The cost of repairing such damage can be high. Not to mention the inconvenience of having a non-functional irrigation system when spring arrives.


By winterizing your system, you're protecting your investment and ensuring it's ready to function efficiently in the warmer months.


When to Winterize Your Irrigation System

The best time to winterize your irrigation system is before the first freeze. This is typically in the fall but can vary depending on your location.

It's important to keep an eye on the weather forecast. If a sudden freeze is predicted, you may need to winterize your system earlier.


Here are some general guidelines:

  • In warmer climates, winterize your system in late October or early November.

  • In colder climates, aim to have your system winterized by mid-October.

  • Always consider the specific weather patterns in your area.


Remember, it's better to winterize early than risk system damage.


Identifying Your Irrigation System Type

Before you begin the winterization process, it's important to identify the type of irrigation system you have. This could be a sprinkler system, a drip irrigation system, or a combination of both.


Knowing the type of system you have will determine the specific steps you need to take to winterize it. For example, a drip irrigation system will require different winterization steps than a sprinkler system.


If you are not sure what type of system you have, check the manual. You can also contact a professional for help.


Necessary Tools and Safety Precautions

Winterizing your irrigation system requires some specific tools. These may vary depending on the type of system you have and the winterization method you choose.


Common tools include an air compressor, a flat-head screwdriver, and insulation tape. You may also need a valve key to turn off the water supply.

Safety is paramount when winterizing your irrigation system. Always wear protective eyewear when using an air compressor. Also, be careful not to over-inflate the system as this can cause damage.


Here is a basic list of tools and safety equipment you might need:

  • Air compressor

  • Flat-head screwdriver

  • Insulation tape

  • Valve key

  • Protective eyewear


blowing out irrigation system


Step-by-Step Guide to Winterizing a Sprinkler System

Winterizing a sprinkler system involves several steps. The process may vary slightly depending on the type of system you have.


First, locate and shut off the main water supply to the irrigation system. This is usually found near the water meter or well pump.


Next, open the drain valves to let water out of the system. These are typically located at the lowest points of the piping.


Then, drain water from the sprinkler heads. Start with the sprinkler furthest from the main valve and work your way back.


After draining, close the drain valves. Also, close the backflow preventer valves if your system has them.


Finally, insulate any above-ground components. This includes backflow preventers and valves. Use insulation tape or foam insulating tubes for this.


Here is a basic list of steps:

  1. Shut off the main water supply

  2. Open the drain valves

  3. Drain water from the sprinkler heads

  4. Close the drain valves and backflow preventer valves

  5. Insulate above-ground components


Manual Drain Valve Method

The manual drain valve method is one way to winterize your sprinkler system. This method is best for systems with manual drain valves.

First, shut off the water supply. Then, open all the manual drain valves.

Once the water has drained out, close the valves. Remember to insulate any above-ground components for winter damage.


Automatic Drain Valve Method

The automatic drain valve method is another option. This method is suitable for systems with automatic drain valves.

Again, start by shutting off the water supply. The automatic drain valves should open on their own to let out the water.

After the water has drained, close the main water valve. Don't forget to insulate above-ground components.


Blow-Out Method

The blow-out method uses an air compressor. It is the most recommended way to protect your irrigation system in the PNW during winter. This method blows out any remaining water after draining the system and valves. Although we don't see much snow in the Pacific Northwest, our temperatures often drop below freezing at night. When water stays in the pipes and freezes, it expands. This can crack or damage your irrigation pipes, leading to expensive repairs in the spring.


First, shut off the water supply. Then, connect the air compressor to the mainline.

Turn on the compressor and blow out the water. Start with the zone furthest from the compressor and work your way back.


Once all zones are clear, disconnect the air compressor. Finally, insulate any above-ground components.


winterizing irrigation system


Insulating Above-Ground Components

Insulating above-ground components is a crucial step. This includes backflow preventers and valves.

You can use insulation tape or foam pipe insulation for this purpose. These materials will protect the components from freezing temperatures.

Remember to secure the insulation well. This ensures it stays in place throughout the winter.


Final Inspection and Adjusting Timers

After winterizing, conduct a final inspection. Check for leaks or damage that might have been overlooked.

Also, adjust the timer or controller settings. This is to ensure the system doesn't activate during the winter months.

Remember, a thorough final check can save you from costly repairs in the spring.


When to Call a Professional

Winterizing an irrigation system can be a DIY task. However, certain situations may require professional help.

If your system is large or complex, consider hiring a professional. Also, if you're unsure about any step, it's better to seek expert advice.

Remember, "winterize irrigation system near me" can be a helpful search term.



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Winterization Checklist

To ensure you've covered all necessary steps, here's a quick checklist:

  1. Identify your irrigation system type.

  2. Gather necessary tools and safety equipment.

  3. Follow the appropriate winterization method for your system.

  4. Insulate above-ground components.

  5. Adjust timers and controllers for winter.

  6. Conduct a final inspection.

  7. Call a professional if needed.


Conclusion and Next Steps

Winterizing your irrigation system is a crucial task. It helps prevent costly damage and ensures the system's longevity.


Remember, each system is unique. Adjust the steps as needed to suit your specific setup.

Lastly, don't hesitate to seek professional help if you're unsure about any part of the process.



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