If you've inherited an older irrigation system or had landscaping done since your system was installed, there's a good chance at least one of your valve boxes has been buried, graded over, or otherwise lost. Finding it is the first step to any repair — and it's more solvable than most homeowners think.
Step 1: Use your controller to identify zones
Run each zone from your controller while you or a helper watches the yard. Look for any area where heads appear but no box is visible nearby — that's a good indicator the valve for that zone is buried somewhere in that general area. Valve boxes are typically within 20 feet of the nearest heads they serve.
Step 2: Check common installer locations
Installers tend to put valve manifolds in predictable places. Check near the main shutoff valve, along the side of the house near the water meter, in corners of garden beds, near fence lines, and along the foundation of the house. Also check near the backflow preventer — manifolds are often grouped close to the water source.
Step 3: Probe with a thin rod
A metal probe or long screwdriver inserted at an angle into the soil near suspected locations can find the hollow sound of a valve box lid a few inches underground. Work systematically in a grid pattern if you're not getting any hits from visual inspection.
Step 4: Use a wire tone generator
If probing fails, a tone generator (available at irrigation supply stores or loanable from some utilities) can be connected to the valve wires at your controller. The signal travels through the wire and can be traced with a receiver wand across your yard. This is the professional method and rarely fails to locate a valve.
If you've tried these steps and still can't find the box, give us a call. We bring locating equipment on most diagnostic visits and can usually find a buried manifold in under 30 minutes.