Your Irrigation System Survived Winter. Now Check If It Actually Works.
Listen, I've watched a lot of humans do this same thing every April. They walk out to the controller box, punch a few buttons, hear the valves click, and assume everything's fine for another six months. Then by June they're staring at a water bill that makes their eyes water more than any sprinkler ever could. The truth is—and I say this as someone who's spent decades watching yards from the edge of the forest—frozen pipes, cracked fittings, and stuck valves don't announce themselves. They just quietly leak your money into the soil.
I'll tell you what: thirty minutes right now, before your lawn even needs serious watering, is the difference between a normal summer bill and one that makes you reconsider your whole life choices. A thorough spring irrigation system startup isn't complicated. It's just methodical. And unlike most things humans worry about, this one actually pays for itself the first time it catches a problem.
Start With the Controller and Main Valve
Walk to your main shut-off valve and backflow preventer first. Most residential systems have them near the point where water enters the property. Before you do anything else, check for visible ice damage, cracks, or mineral buildup around the connections. If you see white crusty deposits, that's calcium—sign the water's been sitting under pressure without moving.
Now here's the thing: folks often skip the visual inspection and jump straight to turning things on. Don't. Turn the controller dial to the "rain" or "off" position first. Then manually open the main isolation valve just a quarter turn. Listen for hissing or see if water spurts from anywhere it shouldn't. If everything looks dry and quiet, open it the rest of the way. Let it sit for a full minute before proceeding.
Check your controller's battery backup hasn't died over winter. If the display is blank or won't hold settings, replace the battery now—not when your system stops mid-cycle in July.
The Pressure Test That Actually Matters
This is where most homeowners go wrong. They assume that if water comes out, the pressure is fine. But a sprinkler system pressure test tells you something way more important: whether the whole network is intact. A slow leak somewhere in buried lines creates pressure drop across the whole system, meaning your sprinkheads spray half as far and your plants get half as much water. You end up watering longer to compensate—and that's where your $200+ monthly waste comes from.
You need a cheap pressure gauge. Pick up a Watts or Amtrol model from any home center—shouldn't cost more than $12. Screw it onto the nearest test outlet on your system (usually near the backflow preventer). Turn on the main valve and one zone at a time, and note the reading.
Most residential systems run 40–60 PSI when operating normally. If you're seeing 25–30 PSI on a zone, something's leaking. Could be a hairline crack in a mainline. Could be a busted sprinkler valve. Either way, it's time to dig deeper before you waste a month's worth of water.
Sprinkler Valve Inspection: Where Most Leaks Hide
The valves are where the work lives. Each zone has at least one valve, usually underground in a plastic box. Flip that box open—carefully, because sometimes spiders and small things have opinions about being disturbed.
Here's what you're looking for: water pooling at the bottom of the valve, white mineral crust around connections, or a valve that doesn't click firmly when you manually activate it. If the valve makes a weak click or no sound at all, the solenoid might be stuck or burned out. That's a $25–$60 replacement, and it's way cheaper to fix it now than to have a zone running 24/7 because the valve won't shut off.
Gently tighten the four bolts holding the valve body to the manifold. Frozen ground expansion can loosen these over winter. Just hand-tight—you're not assembling a deck. Check the connection where the solenoid screws in; if water's weeping from there, you might need a new seal kit ($8) or the solenoid itself.
Back in my neck of the woods, I watched a neighbor ignore a slow drip from one valve connection for an entire summer. Seemed like nothing. By August his water bill had nearly doubled and his front lawn was drowning while the back stayed dry. One fifty-cent washer would've fixed it in March.
The Sprinkler Head Walk-Through
Now activate each zone one at a time and walk the entire perimeter. Most garden centers will point you toward the fancy pop-up heads with self-adjusting arc patterns—and look, they work fine, but you're mostly paying for the marketing. Standard Rainbird or Hunter fixed-arc heads do the job just as well if you maintain them.
What you're looking for:
- Broken nozzles: Frost heave can push heads up and crack the nozzle. Replace it immediately—a broken head creates a geyser that waters nothing but your neighbor's property.
- Clogged internals: Sediment trapped over winter clogs the flow port. A quick soak in vinegar or a replacement nozzle fixes this in minutes.
- Leaking at the base: If water's pooling around a head when it's running, the seal's failed. Pull it, replace the rubber gasket or the whole head, and move on.
- Spray pattern coverage: Watch the actual spray. Does it reach where it's supposed to? Winter frost can shift heads out of alignment.
Count how many heads are actually popping up versus how many are supposed to be there. Missing heads are usually buried or snapped off. Mark these on a map and fix them before watering season ramps up.
Irrigation Leak Detection: The Listening Test
Turn on a single zone and stand still. Just listen. A buried mainline leak sounds like a faint hissing or rushing water underground. If you hear that sound but don't see water, you've got a leak in the buried supply line. This is expensive to fix if you wait—the longer it runs, the more it erodes the soil around the break and the harder it is to locate.
Walk the entire run of that zone with your ear tuned. Most leaks are within 15 feet of a valve box or sprinkler head, especially if the break happened during the freeze-thaw cycle. Mark the spot and call it in to a professional if you can't locate it by hand.
Some leaks don't announce themselves with sound. Instead, you'll see a perpetually soggy spot in the yard, even when the system's been off for days. That's also a mainline break, and it's also worth fixing before summer. Each day that leak runs is another few dollars on your water bill—and your town water authority is watching usage too.
The Water Waste Prevention Strategy
Once everything's tested and the system's running clean, adjust your watering schedule. Most folks run their systems on the same schedule year-round. That's backwards. Spring in the Pacific Northwest—and most of the country—means regular rainfall. Your system shouldn't be running more than once or twice a week, if at all, until late May.
A smart controller with weather monitoring ($150–$300) adjusts automatically. Most of the fancy names are just Rachio or Hunter boxes with different stickers, so shop on price. If you're not ready for that, just manually dial back your zones for spring and don't turn the system fully on until you actually need it.
Water waste prevention isn't about sacrifice. It's about paying attention. The system that works perfectly for three months only works perfectly if you checked it first.
That thirty minutes you spend now testing pressure, inspecting valves, and walking the perimeter—that's not maintenance. That's money in your pocket. And unlike most financial advice, this one actually makes sense.