Sprinkler Blowout Service in South Jersey
Professional sprinkler blowout using compressed air to remove every drop of water from your irrigation system before winter. The single most important step to prevent costly freeze damage to pipes, valves, and sprinkler heads.
Sprinkler System Blowout for South Jersey Homes
A sprinkler blowout in South Jersey costs $75 to $150 for a standard residential system with 4 to 8 zones. Larger systems with more zones or commercial properties typically run $150 to $250. This one-time annual service prevents $500 to $3,000 or more in freeze damage repairs. For complete winterization details, see our winterization timing guide.
Water expands by 9 percent when it freezes. In a rigid PVC irrigation system, that expansion cracks pipes, splits valve bodies, shatters backflow preventer housings, and destroys the internal seals in sprinkler heads. A single hard freeze can damage components across your entire system, turning a $100 blowout into thousands of dollars in spring repairs.
Irrigation Innovations uses commercial-grade air compressors that deliver the volume and pressure needed to clear water from every section of your system. We blow out each zone individually, starting from the zone farthest from the compressor connection and working back, to ensure complete water removal. The process takes 30 to 60 minutes for a typical residential system and should be done before the first hard freeze, which typically hits South Jersey in late October to mid-November.
The Sprinkler Blowout Process
Here is exactly what happens during a professional sprinkler blowout from Irrigation Innovations.
Shut Off Water Supply
We close the main irrigation shutoff valve and the backflow preventer to isolate the system from the water supply. For systems on irrigation wells, we shut down the pump and drain the pressure tank.
Connect Compressor
Our commercial air compressor connects to the system through a blowout fitting at the mainline. We regulate pressure carefully: 50 PSI maximum for polyethylene pipe systems, 80 PSI maximum for PVC systems. Too much pressure damages components; too little leaves water behind.
Blow Out Each Zone
Each zone is activated individually from the controller while compressed air pushes water out through the sprinkler heads. We run each zone until the water mist clears and only dry air exits the heads, confirming the zone is fully evacuated.
Drain Backflow and Mainline
We open test ports on the backflow preventer and drain all water from the above-ground components that are most vulnerable to freeze damage. Mainline drain valves are opened to evacuate any remaining water between the shutoff and the first zone valve.
Controller Programming
We set your controller to rain mode (or turn it off) so it does not attempt to run zones during winter. Rain mode preserves your programming so the schedule is ready to go for spring start-up without reprogramming.
When to Schedule Your Blowout in NJ
The ideal window for sprinkler blowouts in South Jersey is mid-October through mid-November, before the first sustained hard freeze (temperatures at or below 28 degrees for 4 or more consecutive hours). South Jersey's first freeze typically arrives between late October and mid-November, though it can vary by 2 to 3 weeks year to year.
Do not wait until the forecast shows freezing temperatures to call. Our fall schedule fills up fast, and a last-minute cold snap can leave you without an appointment. We recommend booking your blowout in September or early October to secure your preferred date. Most of our maintenance plan clients are automatically scheduled and do not need to call.
Blowing out too early (before mid-October) is also a concern. If you winterize in September and warm weather continues through October, you may be tempted to run the system again, which defeats the purpose. We time each appointment for the sweet spot: late enough that the irrigation season is truly over, early enough that we are well ahead of the first freeze.
Sprinkler Blowout FAQs
A typical home shop compressor does not produce enough air volume (measured in CFM) to properly clear irrigation lines. Most shop compressors produce 2 to 6 CFM, while a proper irrigation blowout requires 15 to 30+ CFM depending on zone size. Using an undersized compressor leaves water in the lines, giving a false sense of protection while leaving your system vulnerable to freeze damage. Our commercial compressors deliver the volume needed for complete evacuation of every zone.
Skipping winterization is the number one cause of irrigation system failure in South Jersey. Freeze damage can crack PVC mainlines ($150-$350 to repair each break), destroy backflow preventers ($200-$500 to replace), split valve bodies ($150-$300 each), and shatter sprinkler head internals ($65-$150 each). A single hard freeze can damage multiple components simultaneously, turning a $100 blowout into $1,000 to $3,000 in spring repair costs. We see this every spring from new clients who skipped winterization the previous fall.
A blowout is the core component of winterization, but a full winterization service also includes shutting off the water supply, draining the backflow preventer, setting the controller to rain mode, and inspecting the system for any existing damage that should be repaired before spring. Our blowout service includes all of these steps as part of the standard visit.
Year-Round Irrigation Care
Full Winterization
Complete fall shutdown including blowout, backflow drain, and controller programming for winter.
Spring Start-Up
Professional spring activation with zone testing, head adjustment, and pressure check after winter.
Maintenance Plans
Seasonal maintenance that includes blowout, start-up, and mid-season inspection in one plan.