As temperatures begin to drop, homeowners in cold climates face an essential maintenance task: winterizing their sprinkler irrigation system. Failing to properly winterize your system can lead to cracked pipes, damaged valves, and costly repairs come spring. Let’s walk you through everything you need to know about protecting your irrigation system.
Why Winterization is Critical
Water left in your irrigation system during freezing temperatures can expand by nearly 10%, creating enough pressure to crack pipes, split metal fittings, and damage your sprinkler heads. A single crack can lead to repairs costing hundreds or even thousands of dollars, making winterization an essential preventive measure.
The Winterization Process
Professional Blowout Method
The most effective winterization method is the “blowout” process, which uses compressed air to remove water from the system. Here’s how this method works
System Shutdown
- Water supply is turned off at the main valve
- Controller/timer is set to “rain mode” or turned off
- All manual drains are opened
Air Compression
- Professional-grade air compressor is connected to the system
- Compressed air (50-80 PSI for residential systems) forces water out through sprinkler heads
- Each zone is blown out individually
- Process is repeated 2-3 times per zone to insure complete water removal
System Protection
- Main valve is insulated
- Aboveground components are wrapped
- Controller is set to winter mode or unplugged
Hiring a Professional
When to Schedule
- Early to mid-fall, before the first hard freeze
- Typically September to October, depending on your location
- Book early, as contractors get very busy during this period
What to Look For
- Licensed and insured contractors
- Experience with your specific type of system
- Proper commercial-grade equipment
- Good reviews and references
Estimated Costs
- Average cost: $75-150 for typical residential systems
- Larger systems: $150-250
- Factors affecting cost: System size, Number of zones, and local market rates.
DIY Considerations
While DIY winterization is possible, it’s generally not recommended because:
- Professional-grade compressors are required (NOT standard shop compressors)
- Incorrect pressure can damage system components
- Proper timing and technique are crucial
- Missing spots can lead to expensive repairs
Additional Winter Protection Tips
Mark System Components
- Flag sprinkler heads near driveways
- Mark valve boxes
- This prevents snow removal damage
Monitor Through Winter
- Check for water seepage during warm spells
- Watch for unusual wet spots in yard
- Inspect visible components for damage
Common Mistakes to Avoid
- Waiting too long to winterize
- Using inadequate air pressure
- Rushing the blowout process
- Forgetting to drain outdoor faucets
- Neglecting to shut off indoor valves
Investment Protection
Think of winterization as insurance for your irrigation system. The cost of professional winterization is minimal compared to potential repair costs:
- Broken pipe repair: $150-300 per location
- Valve replacement: $200-300
- Backflow preventer replacement: $300-800
- Complete system repairs: $2,000-5,000
Conclusion
Proper winterization is essential for protecting your irrigation system. While the process may seem simple, the expertise and equipment required make professional service the smartest choice for most homeowners. Schedule your winterization early, work with qualified professionals, and rest easy knowing your system is protected through the winter months.