Last April, a neighbor called me over because half her garden looked crispy while the other half was drowning. She had turned her system on in March, set the timer, and walked away for six weeks. A single cracked fitting had been dumping water at one end while the far emitters got nothing.
That kind of split happens every spring, and almost every time it traces back to skipping a proper walk-through before the season really kicks off. A good drip system spring startup takes maybe 30-45 minutes, and it saves you from brown plants and a shocking water bill in July.
So here is the routine I run on my own system, and the one I teach every beginner in Tucson. Follow it in order, because each step sets up the next.
Key takeaways
- Turn water on slowly and low to flush debris before you pressurize the whole line.
- Clean your filter and check the backflow device first, since a clogged filter starves every emitter downstream.
- Walk the entire run with the water on and look for geysers, dry spots, and drips at fittings.
- Most spring failures are cheap fixes (a $2 fitting or a rinsed screen) if you catch them early.
Start at the source and work outward
Before you touch anything, find your shutoff valve and your backflow preventer. The backflow preventer is the device that keeps dirty garden water from being siphoned back into your drinking water, and it usually sits right after the outdoor spigot.
Open the main valve slowly. I mean slowly, like counting to ten as you turn it. A fast blast of pressure can pop fittings loose and blow debris deep into your lines, which is the opposite of what you want on day one.
Watch out
If your backflow device sat through a hard freeze, inspect it for cracks before pressurizing. A split backflow preventer can leak steadily and, worse, defeat the safety it exists for. If yours looks damaged or weeps from the seams, replace it before running the system.
If you want to go deeper on why these two parts fail first every spring, my write-up on backflow and filter problems in drip systems covers the common culprits and how to spot them.
Clean the filter before anything else
Your filter screen catches sand and grit so your tiny emitter openings do not clog. Over a winter, that screen collects sediment, and a dirty filter chokes flow to your whole system.
Unscrew the filter housing, pull the screen, and rinse it under a hose or tap. If you see hard mineral crust (common with our hard water here), soak the screen in a 50/50 vinegar and water mix for 15-20 minutes, then scrub gently with an old toothbrush.
A mistake I see constantly is folks running a full season without ever opening the filter. Then they wonder why the far end of the yard barely drips. Clean it now, and plan to clean it again mid-summer.
Quick tip
Buy a spare filter screen for a few dollars and keep it on hand. When one is soaking in vinegar, you can pop the spare in and keep the system running instead of waiting around.
Flush the lines before you cap them
This step gets skipped the most, and it matters. At the far end of each main line (the 1/2 inch tubing that carries most of your water), you either have an end cap or a figure-eight closure.
Open those ends and let the water run for a minute or two. You will often see cloudy water and little bits of grit come out. That is winter sediment leaving your system instead of jamming an emitter.
Once the water runs clear, close the ends back up. Now you can pressurize the full system and start looking for trouble.
Walk the whole run with the water on
With everything flowing, take a slow walk along every line. You are hunting for four things: fountains, puddles, dry emitters, and drips at connections.
- Look for water shooting up where a fitting or emitter blew out (an easy fix).
- Check for soggy soil or pooling that signals a cracked line underground.
- Touch each emitter and confirm it is actually releasing water at its rated flow.
- Inspect every barbed connection and 1/4 inch feeder tube where it meets the main line.
Emitters are rated in gallons per hour, usually 0.5, 1, or 2 GPH. If one emitter is gushing far more than that, it has failed open and needs swapping. If it is bone dry, it is either clogged or the line feeding it came loose.
Good to know
A healthy drip system runs at low pressure, roughly 10-30 psi depending on your emitters. If your yard has too much pressure, a small pressure regulator (around $8-15) installed after the filter protects your fittings all season and stops those spring blowouts.
If you find an emitter that is dry while its neighbors flow fine, my diagnostic checklist for no water from drip walks through isolating whether the problem is the emitter, the feeder tube, or the line.
Common spring problems and quick fixes
Here is a quick reference for what I run into most in April, and roughly what each fix costs.
| What you see | Likely cause | Fix and rough cost |
|---|---|---|
| Geyser at a fitting | Blown barb from freeze or pressure | Replace the coupling, about $2 |
| Whole zone weak | Clogged filter screen | Rinse or soak screen, free |
| One emitter dry | Mineral or sediment clog | Clean or swap emitter, under $1 |
| Puddle in the soil | Cracked buried line | Cut and splice with a coupling, about $3 |
| Steady drip at the source | Cracked backflow or filter housing | Replace part, $15-40 |
Notice how cheap most of these are. That is the whole argument for a spring check. A $2 coupling caught in April beats a dead rose bush and a doubled water bill in July.
Reset your timer and controller
Once the hardware checks out, look at your timer. Winter power blips and dead backup batteries scramble schedules more than you would think.
Swap the controller battery, confirm the current date and time, and set your run times for spring, not summer. Established shrubs like a Texas ranger or a desert willow want deep, infrequent watering, so longer runs a few times a week beat short daily sprinkles.
Then run each zone manually one more time and watch it start and stop. You want to catch a stuck valve now, not discover it during a heat wave.
Where to go from here
Run this routine once at the start of every season and you will spend the summer watering plants instead of chasing leaks. The whole thing gets faster each year as you learn your own system’s weak spots.
If your walk-through turned up something stubborn, my broader guide on fixing common drip irrigation problems goes step by step through the trickier repairs. And if you want to understand the patterns behind why systems fail, the piece on common errors that cause drip system failures will help you head off next spring’s problems before they start. For water-saving practices and rebate info, the folks at EPA WaterSense are a solid, plain-language resource worth bookmarking.
Frequently asked questions
How long should a drip system spring startup take?
For a typical home garden, budget 30-45 minutes the first time you do it. That includes cleaning the filter, flushing the lines, and walking the full run. It gets quicker each year once you know where your system tends to develop weak spots.
Do I really need to flush my drip lines every spring?
Yes, and it is the step people skip most. Winter sediment settles in your tubing, and if you pressurize without flushing, that grit heads straight for your emitter openings and clogs them. Opening the line ends for a minute or two clears it out cheaply.
Why is water only reaching part of my garden after winter?
Usually one of two things. Either a fitting cracked in a freeze and is dumping water at one spot, starving the rest of the line, or your filter screen is clogged and choking overall flow. Check the filter first, then walk the line looking for a blowout or puddle.
What water pressure should my drip system run at?
Most home drip systems run best at roughly 10-30 psi, depending on your emitters. Too much pressure blows fittings apart, which is why so many failures show up right at spring startup. A small pressure regulator installed after the filter, around $8-15, protects everything downstream.
How do I know if an emitter has failed?
Compare it to its rated flow, printed on the emitter as gallons per hour (like 1 or 2 GPH). If it is gushing far more than that, it has failed open and needs replacing. If it is completely dry while neighbors flow fine, it is either clogged or its feeder tube came loose.
Should I replace my backflow preventer every spring?
Not automatically, but always inspect it. A hard winter freeze can crack the housing, causing a steady leak and defeating the safety device that keeps garden water out of your drinking supply. If it weeps from the seams or shows cracks, replace it before running the system, usually a $15-40 part.
