In the yard
Why is my irrigation running but the plants are still dry?
Irrigation that runs on schedule while the plants stay dry usually means the water is escaping before it reaches the emitters, most often through a break in the buried lateral, a valve that is not opening properly, or emitters blocked by mineral. The water is going somewhere, and the plants are telling you it is not to them.
What it usually is
Water lost between the valve and the plant
Irrigation running with dry plants usually means water is leaving the system between the valve and the emitters.
A drip system is a pressurised line with small outlets. If the line opens up anywhere along its length, the water takes the easy route, and everything downstream of the break gets a fraction of what it should. The plants nearest the valve often look fine while the far end of the run dies, which is the pattern worth noticing.
Valley drip line lives a hard life. Ultraviolet light makes above-ground tubing brittle, landscape crews catch it, rodents chew it, and roots eventually find it. The breaks are usually under mulch or gravel where nobody sees them, and in this heat the evidence dries within the hour.
Be honest about it
What it could be instead
Several explanations have nothing to do with a leak:
- The schedule. A zone that runs briefly, or at midday, delivers less water to the root zone than the controller suggests.
- Emitters blocked with mineral, which is the most common cause of a system that works but underperforms.
- The plants have outgrown the system. Emitters sized for new plantings do not feed a mature tree.
- A valve that opens partially, giving the zone pressure but not volume.
Narrowing it down
Reading the pattern across the zone
| What you are seeing | Likely cause | What to check first |
|---|---|---|
| Plants near the valve fine, far end dry | A break part-way along the lateral | Walk the run while the zone is on, looking for wet gravel |
| Whole zone weak, all emitters trickling | A valve opening partially, or low pressure | Listen at the valve box while the zone runs |
| A few plants dry, the rest healthy | Blocked or failed emitters | Pull one emitter and look for mineral |
Ten minutes, on your own
Ten minutes with the zone running
Do this in the morning, when the ground is still cool enough to hold evidence.
Run the zone manually and walk the whole run
Start at the valve and follow the line. You are looking for wet gravel, a soft patch, or water moving where no emitter is.
Look at the far end first
The end of the run is where a break upstream shows itself most clearly, because everything past the break is starved.
Pull one emitter from a dry plant
Mineral inside the emitter body is a different problem from a break, and it is visible immediately.
Open the valve box and listen
Water audible in the box with the zone off, or a valve that hums without delivering, both point at the valve rather than the line.
How urgent is it
Urgent for the plants, not for the house
An irrigation fault threatens nothing structural, so it is not a night-time call. It does have a clock on it in summer, because mature Valley plantings do not survive long on a starved drip zone, and replacing a tree costs more than finding a break.
It also has a bill attached. A break in a zone that runs daily is a continuous loss on every day the controller runs, and that shows up on the next statement whether or not the plants survive.
If you call us
How an irrigation system gets tested
The irrigation is isolated from the house supply first, so the meter can tell us whether the yard is losing water independently of anything indoors. Then each zone is run and pressure tested in turn, because a system with several zones has several possible answers.
Where a zone will not hold, acoustic listening and line tracing follow the lateral to the break, so the repair is one opening rather than a trench. See irrigation and drip system leak detection.
Straight answers
Irrigation questions
Why are the plants at the end of the line the ones that die?
Because a break part-way along the lateral takes the pressure and volume that would have carried on past it. Everything downstream gets a fraction of what it should, so the far end shows the problem first.
How do I tell a blocked emitter from a leak in the line?
Pull one emitter from a dry plant and look inside for mineral. Blocked emitters affect individual plants scattered through the zone; a break affects everything beyond one point on the run.
Can a drip leak show up on my water bill?
Easily. A break in a zone that runs daily loses water every time the controller starts, and because drip zones often run long cycles, the total is larger than the size of the break suggests.
The ground is dry everywhere, so how can it be leaking?
Because Valley ground dries fast. A break that puts water into gravel at six in the morning can leave no visible trace by nine. Walking the run while the zone is actually running is the way to catch it.
Yards we work in
Tell us what the water is doing
Which end of the zone is dry, what the far end looks like, and whether anything is wet while the zone runs.
Send a photo while the zone is running
The dry plants, and anything wet along the run.
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What customers in the Phoenix valley have written. The words are theirs, on listings we cannot edit.
“Humberto has been amazing! Prompt, professional, and patient. He has gone above and beyond, taking the time to show me how to operate the water valves and educating me so I can continue to monitor for future leaks. He identified multiple leaks and made thoughtful recommendations.”
“Beto was very professional, thorough and patient in explaining everything he was doing and why. It was an excellent and well worth it experience, and this is saying something for an architect who had a hundred questions!”
“The owner and operator of this company is everything a contractor should be. On time, honest, competent, reachable, comprehensive. Hope to work with him again in the future.”