Close off the main water supply valve in the meter box.

How to find underground water leak in sprinkler system. Remove the water from the hole with a small cup. Turn on the valve once the ground is dry. This is hard like nate said because the sprinkler system must be running to detect a leak and there are not really any ways to isolate sections and test with the water.

Before installing a new riser, wrap the ends with plumbing tape. A gushing water spout would indicate a broken spray head or leak in the irrigation line. How to find an underground leak.

Allow the ground in that area to dry up. Check the ground around the sprinklers for wet or soggy spots. Turn the valve on your irrigation system and watch the sprinklers.

Look for sprinkler heads that don’t spray properly or have low water flow. To locate the first pipe, dig near the valve boxes and areas close to the sprinkler heads. Cover up that zone’s sprinkler heads with caps.

Shut off the valve for that particular zone. One of the popular methods that professional leak detectors use to find an underground leak involves charging the pipes with nitrogen, an. Next, determine the exact location of your sprinkler system leaking underground.

Clean the spout where the riser is attached with a toothbrush. Trace the path of the irrigation sprinkler lines. Once you unearth the first pipe, keep mapping your system.