Irrigation Shut Down Service

Protect Your Irrigation System from Costly Freeze Damage

Dowco’s irrigation shutdown service protects your system from costly freeze damage during the winter months.

As the leaves begin to change and temperatures drop across Chesterfield and St. Louis County, it’s time to prepare your irrigation system for the cold ahead.

Our experts recommend shutting down your system by the first week of November to make sure it’s fully winterized before overnight temperatures dip below 32°F and the first hard freeze arrives.

If you’re renovating your lawn this fall with aeration and over-seeding, you may want to keep the system running through October to give seedlings the consistent water they need during early germination.

Skipping proper winterization may result in frozen pipes, cracked sprinkler heads, and damaged valves or backflow devices. These repairs add up quickly and often cost far more than prevention. With over 40 years of local experience, Dowco’s certified technicians make sure your irrigation system is shut down the right way—protecting your investment year after year.

Dowco's Irrigation Shutdown Service Includes:

• Turning off the main water line in the basement.

• Blowing out the backflow and entire irrigation system using a commercial compressor (180 psi) to ensure no water remains in pipes, valves, heads, or backflow devices

• Leaving valves in the backflow device open ¼ turn to allow safe expansion and contraction with temperature fluctuations, while releasing condensation from air moisture

The Irrigation Winterization Process

For the appointment, you’ll need to be home so our technician can access the main water line (usually in the basement) and the control timer (typically in the garage).

We encourage homeowners to walk the system with us during the shutdown. This gives us the chance to point out repairs that can be handled immediately or scheduled for spring startup, ensuring your irrigation system is always in peak condition.

Why Homeowners in Chesterfield & St. Louis County Trust Dowco

• 40+ Years of Local Experience: Decades of irrigation expertise in Missouri’s unique climate
• Certified Professionals: Our trained technicians use proven processes to prevent costly freeze damage
• Customer-Focused Care: We protect your investment so you can enjoy peace of mind all winter long
• Reliable Year After Year: Trusted by homeowners across Chesterfield and St. Louis County for dependable winterization services

By choosing Dowco, you’re not just shutting down your irrigation system for the winter—you’re safeguarding your property, preventing expensive repairs, and setting your landscape up for success when spring returns.