Some sprinkler valves are installed above ground and they are easier to locate. These types of sprinkler valves are usually installed near the water source so the best place to start is by looking around the perimeter of the house. Look behind bushes since they can sometimes spread when they grow and end up hiding sprinkler valves. When the sprinkler valves are installed in a valve box that is then buried finding them is more difficult.
How To Find A Sprinkler Valve
Estimate the location of the valves by picturing the layout of the sprinkler system. When you have narrowed down the possible location of the sprinkler valve careful probing can be used to find the exact location. A long screwdriver can be used to probe the ground by going down about six to twelve inches. Be careful when probing to go slow so the probe doesn’t damage the sprinkler valve, water supply valve, or the wiring. The following methods can help narrow down the location of the sprinkler valve.
- Note the location of the pressure vacuum breaker or backflow preventer. The backflow preventer will likely be located near the water source to the sprinkler system. Sometimes sprinkler valves are located close by. If not the backflow preventer will still serve to provide a starting point for the path of the water lines to the sprinkler valves. If the path of the water line seems clear you can try digging a little to follow the path to the sprinkler valve. Be careful not to break the water line when digging.
- Find the sprinkler controller to serve as the starting point for the path of the wires for the sprinkler valves. Sometimes tracing the path of the wires can lead to the sprinkler valves. You may need to dig up some of the yard to follow the sprinkler wires. Just take care not to damage the wires when digging.
- It may be possible to follow the sound of the water leading to the missing valve. Have someone turn on just that zone at the main controller and listen for water going to the valve. Also listen for clicking when the valve is activating or hissing from the water pressure in the valve. This is best done when there is little surrounding noise.
- The order in which the sprinklers in that zone start up can be another clue as to the location of the sprinkler valve. Have a helper manually turn on that zone at the controller and watch carefully. The sprinkler head that is closest to the valve should pressurize slightly sooner than the rest of the sprinklers. Start at that sprinkler and try to find the valve nearby.
Consider drawing up a diagram of the sprinkler system once you have located the sprinkler valves to avoid this problem in the future. It may be awhile before you need to repair or replace a sprinkler valve again and you may not recall the exact location by then.