What you'll learn:
- How to tell a buried line leak from a simple broken head
- How to confirm and locate the leak yourself with the water meter test
- How to tell a sprinkler leak from a plumbing leak before you call anyone
- The three things that break sprinkler pipes in North Texas
- Why a root-damaged line gets rerouted instead of patched
- How a line leak repair actually works, start to finish
Experience level: Beginner to intermediate (finding the leak is the easy part, the repair is the work)
- A buried line leak shows up as a soggy spot, one weak zone, or water running across the driveway, not a single broken head
- Tree roots, run-over corner heads, and expansive clay are the three big causes here
- Root-damaged lines get rerouted around the tree, not patched, because the roots just grow back
- North Texas clay swells wet and shrinks dry, and that seasonal movement cracks rigid PVC joints
- If water is gushing, shut the system off first, then find the leak
Signs You Have a Buried Line Leak
A broken sprinkler head is obvious: water sprays everywhere from one spot. A buried line leak is sneakier, because the water comes up through the soil instead of out of a nozzle. Watch for:
- A soggy spot or area that stays wet between watering days
- One zone suddenly weak while the others are fine, because water is escaping before it reaches the heads
- Water bubbling up from the ground or pooling when a zone runs
- Water running across the driveway or sidewalk toward the street
- A water bill that jumped with no change in your schedule
- Heads that sputter air at the start of a cycle, or soil eroding along a line
If the leak is bad enough that water is pouring out, stop it first. Our emergency shut-off guide walks you through killing the water at the backflow before anything else.
How to Find the Leak: The Water Meter Test
You do not need special equipment to confirm a leak and narrow down where it is. Your water meter already has a leak detector built in: the small triangle or star-shaped dial that spins when any water is moving through the meter.
- Shut everything off. Every faucet, appliance, and the irrigation controller. Nothing in the house should be using water.
- Watch the leak indicator. Open the meter box at the street and watch the small dial for a minute or two. If it is moving with everything off, water is escaping somewhere.
- Isolate the irrigation system. Close the irrigation shut-off valve, usually at the backflow preventer. Watch the dial again. If it stops, the leak is on the sprinkler side. If it keeps moving, skip to the next section, because your problem is not the sprinkler system.
- Find the zone. Reopen the irrigation valve and run zones one at a time from the controller. The leaking zone is the one that is weak at the heads, bubbles water from the ground, or leaves a wet track. A mainline leak shows itself differently: the indicator spins even with every zone off.
- Walk the line. Water surfaces at the lowest point, which is not always directly over the break. Follow the soggy ground uphill along the pipe run and mark the wettest spot.
In heavy clay, a slow leak can travel along the outside of the pipe for several feet before it ever shows at the surface, and a small one may never surface at all. If the meter says water is moving but the yard looks dry, that is when professional valve and line locating equipment earns its keep.
Sprinkler Leak or Plumbing Leak?
The meter test above answers the question that decides who you should call. With the irrigation system isolated at its shut-off valve:
- The leak indicator stops: the leak is in the irrigation system. That is an irrigator's job, and the rest of this guide is for you.
- The leak indicator keeps spinning: the leak is on the house side, either the service line between the meter and the house or under the slab. That is a plumber's job. A licensed irrigator cannot repair your service line or a slab leak, and anyone who says otherwise is the wrong person to have in your yard.
One more DFW-specific wrinkle: the same expansive clay that cracks sprinkler pipes also shifts foundations and plumbing. A warm spot on the floor, the sound of running water inside with everything off, or a wet patch right against the foundation points toward plumbing, not irrigation.
Why Sprinkler Pipes Break in North Texas
Pipes do not usually fail on their own. Around the DFW Metroplex, three things cause most of the buried leaks we see.
Tree Roots
Roots grow toward water, and a leaky or sweating irrigation line is a steady water source. Over a few seasons they wrap around the pipe and, as they thicken, crush it or push a fitting apart. A line that runs straight through a tree's root zone is living on borrowed time.
Driveway and Sidewalk Corners
The heads tucked at the corner of a driveway or sidewalk take a beating. A car tire clips them, or a mower wheel rolls over them, and the impact does not just crack the head, it can snap the riser, swing joint, or elbow below the surface. Now you have a buried leak under the edge of the concrete, not just a broken nozzle.
Expansive Clay Soil
This is the big one in North Texas. We sit on Blackland Prairie clay that swells when it gets wet and shrinks when it dries out, moving the ground several inches between a wet spring and a dry August. That constant shift stresses rigid PVC, and the rigid joints and fittings are where it gives. A glued joint that was fine for years finally cracks, usually after a hard dry spell followed by heavy rain. Our clay soil irrigation guide goes deeper on how DFW soil behaves.
The Tree-Root Fix: Reroute, Don't Cut
When roots take out a line, cutting the roots back is a waste of money. They grow back, and you are repairing the same spot in two seasons. The right fix is to move the pipe out of the root zone entirely.
A proper reroute means finding the existing trench, cutting the line at a clean spot on each side of the tree, and trenching a new path well outside the canopy's drip line. Everything in that trench gets reconnected: the main line, any lateral lines, and the control wires that often share the same trench. Where a line has to stay near a tree, burying it deeper or adding a root barrier buys time. Protecting your buried lines covers the prevention side.
When a root takes out a line under a big tree, you don't fight the roots. You find the trench, cut it at a good spot, and run the new pipe wide around the tree so the roots never get back to it. Otherwise you are back digging the same hole next year.
Brandon Surratt, TCEQ Licensed Irrigator LI0023963How a Line Leak Repair Works
The leak itself is usually a small break. Most of the work is finding it and getting to it.
- Confirm the zone. Run each zone and watch for the soft, wet, or low-pressure one.
- Narrow the location. The wet spot is the clue, though water can travel along a pipe before it surfaces. A diagnostic visit with a valve and line locator pins it down without digging blind.
- Expose and cut. Open up the line and cut out the damaged section.
- Repair or reroute. A clean break gets a coupling. A root-caused break gets the reroute above. A mainline break (always under pressure) is the urgent one.
- Reconnect, test, backfill. Pressure up, confirm it holds, then close it back up.
For a straightforward broken lateral, this is a routine sprinkler repair. For pricing on common repairs, see our sprinkler repair cost guide.
What You Can Do, and When to Call
A lateral line only has water in it when that zone runs, so a lateral leak is lower stakes. A main line is pressurized all the time, so a mainline leak runs nonstop until the water is shut off. If water keeps flowing with every zone off, treat it as a mainline leak and shut off at the backflow.
You can handle a simple, shallow lateral break you can see: cut out the cracked piece and slip in a coupling. Bring in a pro when:
- The leak is under a driveway, sidewalk, or patio
- It is a mainline leak that will not stop
- Roots are involved and the line needs a reroute
- You cannot find where the water is coming from
- The soil is heavy clay and digging by hand is not realistic
A broken sprinkler head at a corner is worth a closer look too, since the same impact that broke the head often cracked the pipe underneath.
Frequently Asked Questions
How do I know if I have an underground sprinkler line leak?
Look for a soggy spot that stays wet between watering days, one zone that is suddenly weak while the rest are fine, water bubbling up from the ground, or water running across the driveway. A jump in your water bill with no schedule change is another tell.
How do I find an underground water leak in my yard?
Start at the water meter. With everything in the house and the irrigation system off, watch the small leak indicator dial. If it spins, water is moving somewhere. Then close the irrigation shut-off valve: if the dial stops, the leak is in the sprinkler system. Run zones one at a time to find the wet, weak, or bubbling zone.
Is it my sprinkler system or a plumbing leak?
Close the irrigation shut-off valve at the backflow and watch the meter's leak indicator. If it stops moving, the leak is on the irrigation side. If it keeps moving with the irrigation isolated, the leak is on the house or service line side, which is a plumber's job, not an irrigator's.
Can you just cut the tree roots instead of moving the pipe?
You can, but it is a temporary fix. Roots grow back toward the water and break the line again, often within a season or two. The lasting fix is to reroute the line in a new trench well outside the tree's root zone.
Why do my sprinkler pipes keep cracking in North Texas?
Expansive Blackland Prairie clay swells when wet and shrinks when dry, moving the ground several inches between seasons. That movement stresses rigid PVC and its joints until a fitting cracks, most often after a hard dry spell followed by heavy rain.
Can I repair a broken sprinkler line myself?
A shallow, visible break on a lateral line is a reasonable DIY repair with a coupling. Leaks under concrete, mainline leaks that will not stop, and root-caused breaks that need a reroute are jobs for a pro with locating equipment.
How much does it cost to fix a sprinkler line leak?
It depends on how deep the line is, what it runs under, and whether a reroute is needed, so it is quoted per job after seeing it. See our sprinkler repair cost guide for the range on common repairs.
This guide covers the whole DFW Metroplex. For how Brandon, a TCEQ Licensed Irrigator, tracks down and repairs a buried leak on your street, start with your city: