Start by trying to gently tighten it up and see if that helps.
Sprinkler water shut off valve leaking.
If the leaks happen directly after running the sprinkler system and do not occur all the time then this normal drainage is likely the cause.
Pack valve box with dry rags to absorb water.
Reinstall the packing nut tighten lightly with a wrench don t over tighten at this or any other point and reattach the handle.
If the fixture never froze then either wear vibration or a dried seal is the culprit.
Sprinkler school so your sprinkler system is off but your sprinklers are still leaking water.
Each valve in your sprinkler is like a faucet which shuts off and turns on water flow.
Remove the old washer and slide on the new one.
You have a threaded fitting that leaks.
Like any faucet in your home they can leak.
Remove lid from valve box and clean out mud from inside of box with hand trowel.
Sprinkler valve leaks are generally due to one of two reasons.
A blockage could also be an indication that the valve is worn out and requires replacement.
Next remove the handle from the stem and then loosen and remove the packing nut.
After each run of your sprinkler system there is low head drainage or excess water that is still draining from the pipes after the water is switched off.
Shut off the water to the sprinkler system.
Unscrew the bonnet from the top of the valve using a phillips screwdriver.
Twist out the low voltage solenoid valve then wait for excess water to drain out.
First shut off the water to the leaking water valve.
The two most likely culprits are a leaking valve or low head drainage.