How to Winterize a Sprinkler System: A Step-by-Step Guide

Failing to winterize your system can lead to frozen pipes, damaged components, and costly repairs come spring. Here’s a comprehensive guide on how to winterize your sprinkler system effectively.

Step 1: Turn Off the Water Supply

The first step in winterizing your sprinkler system is to shut off the main water supply. Locate the shut-off valve for your irrigation system, which is usually found near the back flow preventer (or RPZ) or where the system connects to your main water line. Ensure the valve is turned clockwise to close it completely.

Step 2: Drain the System

There are three primary methods to drain your sprinkler system: manual drainage, automatic drainage, and blow-out.

1. Manual Drainage:
• Open the drain valves located at the lowest points of your system. This will allow any remaining water to flow out.
• Leave the valves open to ensure any residual water can escape.

2. Automatic Drainage:

• If your system is equipped with automatic drain valves, these will open when the pressure drops. Simply turning off the water supply should activate this feature, allowing water to drain.

3. Blow-Out Method:

• For a more thorough drainage, you can use an air compressor. Connect the compressor to the system’s blow-out port and set the pressure to a maximum of 50 PSI.
• Start with the zones furthest from the compressor and activate them one at a time. This will force any remaining water out of the lines.
• Continue until all zones have been cleared of water. Be cautious not to exceed the recommended pressure to avoid damaging the pipes.

Step 3: Insulate Above-Ground Components

Any above-ground components, such as valves, back flow preventers, and exposed pipes, should be insulated to protect them from freezing temperatures. Use pipe insulation or foam covers to wrap these parts securely.

Step 4: Adjust Your Sprinkler Heads

Before winter, lower your sprinkler heads to avoid any snow accumulation that could damage them. If possible, remove and store any decorative or removable sprinkler heads for added protection.

Step 5: Check the Timer and Controller

Turn off your irrigation timer or controller to prevent it from running during the winter months. If your system has a battery backup, ensure it is functioning correctly, as power outages can reset the timer in the spring.

Step 6: Final Inspection

Once you’ve completed these steps, conduct a final inspection of your system. Check for any signs of damage, leaks, or wear and tear that may need attention before the next growing season. Make a note of any repairs that need to be addressed in the spring and call Classic Plumbing & Air for your required RPZ inspection. 

Winterizing your sprinkler system is an essential task to prevent damage from freezing temperatures and ensure your irrigation system is ready to go when spring arrives. By following these steps, you can protect your investment and enjoy a lush, green yard when warmer weather returns. Taking the time to properly prepare your system now will save you time and money in the long run, allowing you to focus on enjoying your outdoor space. If you need help winterizing your irrigation systems and RPZ back flow preventer, call Classic Plumbing & Air to schedule a visit from one of our RPZ certified professionals.