The first sprinkler system startup of the season often surfaces problems that stayed hidden all winter — knowing what specifically to check during that first turn-on, beyond just flipping a switch, prevents a minor issue from becoming a real headache mid-season.
Why the First Turn-On Deserves Extra Caution
A system that sat dormant through a Utah winter has been exposed to freeze-thaw cycles that can crack fittings, shift buried lines, or damage valve components in ways that aren’t visible until water pressure is actually restored. Rushing this first startup, rather than working through it deliberately, is how a small existing problem turns into water damage or a much larger repair.
What to Check Before Any Water Flows
A visual walk of the system before turning anything on can catch obvious damage — a cracked head, an exposed pipe, unusual settling near a valve box — that’s better addressed before pressurizing the system than after. Confirming the main shut-off valve is fully closed to start gives you a controlled, known starting point for the process.
Opening the Main Valve the Right Way
Opening the main valve gradually, rather than all at once, prevents the kind of pressure surge that can stress or damage components already weakened by winter. Watching closely as pressure builds — for leaks, unusual sounds, or a sudden pressure drop — lets you catch a problem in real time rather than discovering it later as standing water in the yard.
Why Testing Zones Individually Matters More at First Turn-On
Running each zone separately, rather than assuming the whole system is fine because the first zone worked, is especially important during the initial spring startup, when winter damage could be isolated to just one section of the system. A zone-by-zone approach also flushes out any debris that settled in the lines over the dormant season.
Common First-Startup Problems and What They Signal
A head that doesn’t pop up or spray unevenly often points to debris blockage or physical damage from winter. A zone with noticeably weak pressure across multiple heads can indicate a valve that didn’t fully open or a leak somewhere upstream in that zone’s line. Water pooling near a valve box, rather than at a sprinkler head, usually signals a leak at the valve itself rather than in the sprinkler lines.
Resetting the Controller for the New Season
Once every zone is confirmed working correctly, reprogramming the controller for spring conditions — generally earlier or later in the day to reduce evaporation, and a schedule reflecting spring’s cooler, wetter conditions rather than carrying over last year’s summer settings — completes the startup process.
Frequently Asked Questions
When is the right time to turn on a sprinkler system in Salt Lake City?
Once the risk of a hard overnight freeze has passed, typically in April, though exact timing shifts year to year with the season’s weather.
What’s the most common issue discovered during spring turn-on?
Cracked or damaged sprinkler heads from winter freeze-thaw cycles are among the most frequently discovered problems during a proper startup inspection.
Should I call a professional for the first spring turn-on, or handle it myself?
A careful, methodical approach is workable for a straightforward system, but a professional can catch subtler issues and make repairs on the spot if winter damage is discovered.
What to Do If You Discover Damage During Startup
Finding a cracked head or a leaking fitting during the initial turn-on isn’t cause for alarm — it’s a normal outcome of a system that sat through winter freeze cycles. Shutting off the affected zone, noting the issue, and either repairing it directly or scheduling professional service keeps the rest of the system operational while that one issue gets addressed.
Setting Up for an Easier Turn-On Next Year
Properly winterizing the system each fall — fully draining lines and blowing out remaining water — significantly reduces the damage found during the following spring’s turn-on. A system winterized correctly one year makes the next year’s startup considerably faster and less eventful.
Need help getting your sprinkler system started this spring? Contact Millburn Lawn & Landscape for professional turn-on and repair service.
