Winterizing Your Lawn Sprinkler System in Houston, TX. Step-by-Step Instructions

As Houston experiences occasional dips into freezing temperatures, protecting your lawn sprinkler system becomes crucial to prevent costly repairs in the spring. Winterizing your system not only safeguards your investment but also ensures your lawn remains healthy through the colder months. Here’s a comprehensive guide tailored for Houston homeowners.
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Understanding Houston's Winter Weather
Houston's winters are generally mild, but we've seen our share of freezes. Typically, you won't need to winterize until forecasts predict temperatures below 30 degrees Fahrenheit. Remember, it's not just about the cold; it's about protecting your system from the rare but possible hard freeze that could damage your sprinkler components.
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Steps to Winterize Your Sprinkler System

1. Turn Off the Water Supply:

• Locate the main shut-off valve near your water meter or by the backflow preventer. Turn the handle perpendicular to the pipe to shut off the water supply. This is the first and crucial step to prevent water from freezing inside the pipes.​​

2. Drain the System:

• Manual Drain: Open any manual drain valves in your system. These are often found in the valve box and should be turned to drain out any water. If your system doesn't have these, proceed to step 3.
• Automatic Drain: For systems with automatic drains, turn on each zone one by one to force water out through the heads until no more water comes out.​
  

3. Blow Out the Lines (If Necessary):

• While this step might not be necessary for all Houston homes due to the mild winters, it's recommended if extremely low temperatures are forecast. Use an air compressor to blow out the water from the lines:
  • Connect the compressor to the system with the correct fittings.
  • Open one zone at a time, starting furthest from the compressor, and blow air through until only air, not water, comes out.
  • Be cautious with the PSI; for PVC, don't exceed 80 PSI, and for polyethylene, keep it under 50 PSI.​
    

4. Protect the Backflow Preventer:

• Since the backflow preventer is usually above ground, it's at risk. You can:
  • Drain it: Open the test cocks and the drain valve on the backflow device.
  • Insulate it: Use insulation covers or blankets designed for backflow preventers.​
    

5. Check and Seal:

• Inspect for any visible damage or leaks. Ensure all valves are properly closed to keep air from entering the system, which could introduce moisture later.

6. Wrap Exposed Pipes:

• If you have any PVC pipes above ground, wrap them with insulation tape or foam to protect against the cold.

Additional Tips for Houston Homeowners

• Monitor Weather Forecasts: Only winterize when low temperatures are expected. Houston's weather can be unpredictable, so stay informed.
• Consider Professional Help: If you're unsure about any step, or if you feel the task is beyond your DIY capabilities, professional irrigation services can provide peace of mind. They can also perform a fall inspection, ensuring your system is ready for winter.
• Reactivation in Spring: When spring arrives, remember to turn your system back on gradually. Reset your controller, check for any winter damage, and slowly reintroduce water to avoid system shocks.

Winterizing your lawn sprinkler system in Houston might seem like an extra task, but it's vital for avoiding the headaches and costs associated with freeze damage. By following these steps, you'll ensure your system remains functional year after year, keeping your lawn lush and your pocket happy. Always consider the local weather patterns and don't hesitate to seek professional advice when in doubt. Here's to a well-protected sprinkler system and a beautiful, healthy lawn come spring