Irrigation Leak Repair in North Georgia

There are two kinds of irrigation leak and the difference decides how urgent your repair is.

A lateral line leak is downstream of a valve. The lateral only carries water while that zone is running, so the leak loses water for the length of the program and then stops. Annoying, wasteful, not an emergency. A mainline leak is upstream of the valves, on the pipe that stays pressurised twenty-four hours a day. That one loses water every minute of every day whether the system is programmed to run or not, and it is the reason a water bill can triple in a single cycle.

A third category sits between them: a valve that is no longer sealing. Water weeps past the diaphragm into a lateral, so you get a head that dribbles or a soggy patch with the system off, and the loss is continuous like a mainline leak.

Symptoms homeowners notice

• A patch of lawn that is soft, spongy or squishy underfoot and never dries out
• Water bubbling or welling up through the turf or a bed
• A water bill that jumped sharply with no change in household use
• A sunken or eroding area, or a rut appearing along a straight line
• Grass noticeably greener and faster-growing in one strip or circle
• Water trickling from the lowest head on a zone long after the program ended
• A valve box holding standing water
• Pressure that has dropped across the whole system, not just one zone
• The water meter still moving with every fixture off and the controller off
• Gravel, silt or mud appearing at a head after a nearby dig

The most likely causes

• Cracked PVC or split poly pipe. Pipe fails from ground movement through wet and dry cycles, from shallow-depth freeze damage, from stress at a poorly supported fitting, or from age and UV damage where it was left exposed.
• Excavation strikes. Fence post holes, mailbox posts, tree and shrub planting, deck footings, sod cutting, aeration and trenching for other utilities. This is the most common cause of a sudden leak on a system that was fine last week.
• Root pressure. Mature hardwood and pine roots wrap around pipe and slowly crush it, or lift and shear it at a rigid fitting. Common across older Hall County and Gwinnett neighbourhoods.
• Failed fittings and glue joints. A solvent-weld joint that was dry-fitted, under-cemented or assembled on a dirty pipe end will eventually separate. Barbed poly fittings back out when the clamp corrodes.
• Valve not sealing. Grit or a torn diaphragm holds a valve slightly open, so water weeps continuously into the lateral downstream.
• Broken head or riser below grade. When the threaded riser snaps underground rather than at the cap, water escapes into the soil rather than spraying, so there is no visible spray to alert you.
• Pressure too high. Static pressure above what the pipe and fittings were specified for fatigues joints and shortens the life of the whole system.

How a technician diagnoses it

• Finding an underground leak is a process of elimination, and doing it in order is what keeps the digging small.
• First we confirm the loss is real and measure it. With every fixture in the house off and the controller off, the water meter should be still. If it is creeping, water is escaping downstream of the meter. Closing the irrigation isolation valve and re-reading the meter then tells us whether the loss is on the irrigation system or in the house plumbing — a two-minute test that saves a great deal of guesswork.
• Next we isolate. Each zone is run and observed individually while we watch pressure behaviour and surface evidence. A zone that loses pressure noticeably faster than the others, or that produces a wet area away from any head, has the break. If the loss happens with all valves closed, the fault is on the mainline or at a valve.
• Then we pinpoint. Surface clues do most of the work: welling water, a line of unusually green grass, a soft depression, silt at a head. Where nothing shows at the surface we narrow the search by probing, by exposing pipe at accessible points such as the valve manifold, and by tracing the pipe run from known fittings. Valve locating equipment finds buried valves and traces field wire, which usually runs alongside the pipe and gives us the route.
• Only then do we dig, and we dig where the evidence points rather than opening a trench along the whole run.

What the repair involves

1. Confirm and quantify. Meter test with the house isolated, so we know the loss is irrigation and roughly how big it is.
2. Isolate to a zone or the mainline. Zones run one at a time. This is what separates a lateral repair from a mainline repair.
3. Pinpoint. Surface evidence, probing and pipe tracing narrow the break to a small area before any turf is cut.
4. Shut down and depressurise. The isolation valve is closed and the line drained so the repair can be made dry.
5. Expose. Turf is cut and lifted in one piece, not shredded, and the hole is kept as small as access allows.
6. Repair. PVC is cut back to sound pipe and repaired with a coupling or slip fix; poly is repaired with barbed fittings and stainless clamps. Fittings are matched to the existing material, not improvised.
7. Pressure-test before backfill. The system is repressurised and the repair watched under pressure while it is still exposed. Backfilling before testing is how a second visit happens.
8. Backfill and restore. Soil is replaced and tamped in layers, the turf is laid back and watered in, and the zone is run to confirm heads recovered their pressure.

What affects the cost

Leak repair is the irrigation repair with the widest cost spread, because almost all of the cost is in finding and reaching the break rather than the fitting that fixes it.

• How long the leak takes to locate — a bubbling wet spot is fast, a leak with no surface evidence is not
• Mainline versus lateral: mainline pipe is larger, deeper and pressurised, so repairs take longer and more care
• Depth of the pipe and how much soil has to come out
• What is on top of it: turf, a planted bed, gravel, a driveway, a patio or a retaining wall
• Tree roots in the excavation, which have to be worked around rather than cut through
• Pipe diameter and material, and whether matching fittings are readily available
• How many breaks there are — brittle old pipe often fails in more than one place
• Whether the cause was a previous poor-quality repair that has to be redone properly
• Emergency or after-hours response, which is billed port-to-port plus $125

For published rates and general North Georgia market ranges by repair type, see the Georgia irrigation repair cost guide.

Does this repair require digging?

Yes. An underground leak is under the ground, and no detection method available removes the need to expose the pipe to repair it. What is controllable is how much digging happens, and that is entirely a function of how well the leak is located first.

A properly pinpointed lateral repair is typically a hole a foot or two across. We cut the sod in a flap and fold it back rather than removing it, stack the soil on a tarp, make the repair, pressure-test it while it is still open, then backfill in layers and lay the turf straight back. Watered in, that patch knits back within a couple of weeks in the growing season. Mainline repairs and leaks under hardscape need more access, and repairs under a driveway or patio sometimes mean rerouting the pipe around the obstruction rather than breaking concrete.

How long does it take?

A leak with clear surface evidence in open turf is commonly a one-to-two hour job including locating, excavation, repair, testing and backfill. Leaks with no surface clue take longer, because the locating is the work. Mainline repairs, repairs at depth, and leaks under or beside hardscape run longer again.

We will give you the diagnosis and the estimate on site before we start digging, and if a leak turns out to be a bigger job than the initial evidence suggested, you hear that before the cost changes rather than after.

Should the water be shut off?

Yes — if you suspect a mainline leak, close the irrigation isolation valve now rather than waiting for the appointment. The mainline holds pressure continuously, so every hour it stays open is water lost. Switching the controller to OFF does not help with a mainline leak, because the controller only governs the valves downstream of it.

The irrigation isolation valve is usually a ball or gate valve where the irrigation line branches off the house supply: commonly in a small round or rectangular box in a bed, near the meter, or inside a crawlspace or basement wall. If you cannot find it, closing the main water shutoff to the house will stop the leak, and we will locate and tag the irrigation isolation valve while we are on site so you never have to hunt for it again. There is a walkthrough in where is my irrigation shutoff valve.

Will leaving it alone raise the water bill?

This is usually the most expensive symptom of an irrigation leak, and it is the one most homeowners notice first.

The arithmetic is unforgiving. A leak running continuously at even a modest rate moves a surprising volume over a billing cycle, because it never stops — not overnight, not while you are on holiday, not in the rain. Mainline leaks and valves that weep are continuous losses. Lateral leaks only run during programmed watering, which limits the damage but does not make it cheap on a system that runs several zones several times a week.

There is a second cost that does not appear on the bill: water escaping below grade saturates soil, undermines beds and hardscape, and in the worst cases finds its way toward a foundation or a basement wall. Fixing a leak early is cheaper than fixing a leak plus what it soaked.

North Georgia considerations

Piedmont clay changes how irrigation leaks present. Because clay accepts water slowly, a leak often spreads sideways under the turf and surfaces some distance from the actual break — sometimes downhill of it, occasionally at a head. Following the wet spot straight down is a reliable way to dig in the wrong place, which is why isolating by zone first matters so much here.

Clay also holds moisture long after the leak stops, so a wet area that persists for days is not proof the leak is still running. And on the sloped lots common around Lake Lanier and the Chattahoochee corridor, a leak on a hillside can erode a channel under the sod with very little showing on the surface.

Winter is the other regional factor. North Georgia does not freeze deeply, so most buried pipe is safe. What does fail is everything shallow or exposed: backflow assemblies above grade, pipe that was never buried to proper depth, and heads and risers in the top few inches of soil. Those are the components that split during a hard freeze and start leaking when the system is next pressurised in spring.

Frequently asked questions

Related services

Where we do this work

Irrigation Medics covers Hall County and the Lake Lanier communities, the Gwinnett corridor through Duluth, Suwanee and Buford, and North Fulton and Forsyth. Rates are the same everywhere — see the full service area.