Where Is My Irrigation Shutoff Valve?

Where to look, in order

1. At or near the water meter. Often in the meter box itself or in a separate small box beside it, on the house side of the meter. Look for a valve on a branch line rather than on the main run.
2. At the backflow prevention assembly. If the system has an above-ground backflow device — usually a brass assembly on a riser near the house or the meter — there is normally an isolation valve on its inlet side.
3. In a round or rectangular box near the foundation. Frequently on the side of the house where the irrigation line was tapped in, often close to an exterior hose bib.
4. In the basement or crawlspace. On systems plumbed from inside, there may be a dedicated valve on the irrigation branch, sometimes labelled, near where the line exits the wall.
5. In or beside the valve manifold box. Less common, but some installations put an isolation valve in the first valve box.
6. At a pump, on well or lake-fed systems. Properties drawing from a well or from Lake Lanier have an isolation valve at the pump or pressure tank rather than at a meter.

What it looks like

Usually one of three things. A ball valve with a lever handle, which closes with a quarter turn — handle across the pipe means closed. A gate valve with a round wheel handle, which needs several turns clockwise and should not be forced once it stops. Or a valve with no handle at all, needing a meter key or a valve wrench, common on curb-side installations.

Ball valves are the easiest to be certain about, because the handle position tells you the state at a glance. Gate valves on older installations can seize, and forcing a seized gate valve can break the stem — if it will not move with reasonable effort, stop and have it looked at rather than snapping it.

Do not confuse it with the house shutoff

The house main shutoff cuts water to the entire property, including the irrigation. It will stop a leak, but it also leaves you without water indoors, so it is a blunt instrument rather than the right tool.

The irrigation shutoff isolates only the sprinkler system. Closing it stops any irrigation leak completely while leaving the house supply intact, which is exactly what you want while waiting for a repair. Being able to do that turns an urgent problem into a scheduled one.

When you actually need it

• Water flowing continuously with the controller switched off — a mainline leak or a valve that will not seal. The controller cannot stop this.
• A large break discharging visibly, where the priority is stopping the loss immediately.
• Before any work on the mainline, the valve manifold or the backflow assembly.
• Winterization on systems where the irrigation line is isolated and drained.
• Extended absence, on properties where the owner would rather the system be isolated than pressurised unattended.

If you genuinely cannot find it

Some systems, particularly older ones and ones installed by a previous owner’s contractor, do not have an accessible dedicated isolation valve, or it has been buried under years of mulch and sod. In that situation the house main is the fallback for stopping an active leak.

It is worth having one fitted, or the existing one located and brought back to grade with a proper box, at the next service visit. It is a small job that turns the worst version of an irrigation failure — water running with no way to stop it — into a quarter turn. We record valve and shutoff locations for the systems we work on so it does not have to be found twice.

Related answers

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• How Do You Find an Underground Sprinkler Leak?An underground irrigation leak is located by measuring, not by looking. A technician isolates the system at the irrigation shutoff valve and watches…
• Do I Need to Winterize My Sprinkler System in Georgia?Yes, though North Georgia needs less than colder regions. Winters here are mild enough that deeply buried pipe is generally safe, but cold enough…
• Why Is Water Bubbling Up From the Ground in My Yard?Water bubbling up from a lawn almost always means a broken irrigation line or a sprinkler head that has snapped off below the nozzle, leaving an open…

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Where we work

Irrigation Medics repairs irrigation systems across Hall County and the Lake Lanier communities, the Gwinnett corridor through Duluth, Suwanee and Buford, and North Fulton and Forsyth — Johns Creek, Alpharetta, Milton, Roswell and Cumming. Same rates throughout. See the service area.