20 Oct How to Protect Sprinkler Heads and Valve Boxes From Snow Plow Damage on Long Island
The best way to protect a sprinkler system from a snow plow is to mark every sprinkler head, valve box, and backflow device with tall, visible stakes before the ground freezes, then walk the property with whoever plows it and hand them a map. Winterizing keeps water from freezing inside the lines, but it does nothing to stop a plow blade from shearing off a head at the edge of the lawn, and damage buried under snow often goes unnoticed until spring turn on.
Why Plows Damage Sprinkler Systems
Irrigation components sit exactly where plows work. Heads run along the edges of lawns, medians, and planted islands. Valve boxes sit flush with the ground. Backflow assemblies and exposed plumbing stand near buildings and curbs. Once snow covers the ground, none of this is visible to a driver, and a blade or a pile can catch it before anyone knows it is there.
The Snow & Ice Management Association’s staking guidance makes the same point from the plowing side. It says marking hidden obstacles with stakes reminds drivers that something is below the snow, and that proper staking helps reduce property damage, equipment damage, and injuries.
What to Mark
- Sprinkler heads along lot edges, medians, planted islands, and walkway borders
- Valve boxes and manifolds
- Backflow devices and the exposed piping around them
- Controllers, rain sensors, and any posts or enclosures above ground
- Hose bibs that are part of the irrigation system
- Curb edges and landscape bed borders where plow blades tend to dig in
- Fire hydrants, utility boxes, and drainage structures, which the SIMA guidance also lists
How to Mark Them
- Mark before the ground freezes. Stakes will not go into frozen soil, and the first storm can arrive earlier than the calendar suggests.
- Use tall, bright stakes. Trade guidance calls for markers at least three feet tall for hazards such as medians, low landscaping, and hydrants. Consider taller stakes where large piles are expected, so they are not buried.
- Mark both sides of a hazard. The SIMA guidance recommends stakes on the leading and back edges of hazards so a driver approaching from either direction sees them.
- Mark where snow should and should not go. Piles belong away from valve boxes, backflow devices, hydrants, and walkways. SIMA notes that site maps and staking should show where snow is to be piled.
- Draw a simple map. A one page sketch showing heads, valve boxes, backflow devices, and no pile zones gives every driver the same information, including a substitute who covers a long storm.
- Check the stakes during the season. Heavy storms knock stakes down. Walk the property after major events and reset them.
Walk the Property With Your Snow Contractor
Staking works best alongside a conversation. A pre-season site walk is the right moment to hand over the map and name the irrigation components that need to be avoided. Our own commercial snow removal service begins that way: before winter, we walk each contracted property with the property manager or owner to map plowing routes, priority areas, and concerns such as landscaping to avoid.
Property managers weighing snow coverage can see how that works at apartment complexes, shopping centers, and industrial complexes. Our snow removal is for commercial properties only. If you manage a single home, ask whoever plows your driveway to walk it with you and look at the same list.
Winterize First, Then Mark
Marking protects against the plow, and winterizing protects against freezing, so you need both. A winterizing service clears water from heads, piping, valves, manifolds, exposed plumbing, and connected hose bibs before the first freeze. If you are still deciding how, read our comparison of blowout versus draining, our fall winterization checklist, or our guide to when to winterize on Long Island.
What Plow Damage Looks Like in Spring
Because snow hides the damage, it tends to show up when the system comes back to life.
- Sheared or cracked sprinkler heads
- Bent or tilted risers
- Valve boxes that are cracked, shifted, or filled with debris
- Zones that will not build pressure or that spray where they should not
- Turf scraped or torn along the lot edge, usually near the damaged heads
A spring turn on service that checks every head and tests every zone from the controller is how most of this gets found, and our sprinkler repair service handles what turns up.
Long Island Winters Raise the Stakes
Long Island can produce storms big enough to bury any short marker. In the blizzard of late February 2026, Long Island MacArthur Airport reported 31 inches of snow, and unofficial reports put several Islip area hamlets above 20 inches. Coastal snow also tends to be wetter and heavier than inland snow, which makes piles harder to move and more likely to push against whatever is in their path. Plan stake height and pile locations for the worst storm, not the average one.
When to Call McCormack Irrigation
McCormack Irrigation has handled sprinkler repair, winterizing, and spring turn on for Long Island properties since 2001, and we provide commercial snow removal as well, so we see both sides of this problem. Our in-house crews, never subcontractors, are backed by an A+ rating with the Better Business Bureau and a 4.9 out of 5 rating across more than 330 Google reviews. If you want your system winterized and your commercial property’s snow plan set before the first storm, call (631) 744-1500 or contact us online.