Why is water seeping at the sprinkler?
 
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  Why is water seeping at the sprinkler?
If you notice water seeping out of your sprinklers and creating a wet spot, there are two typical reasons behind the seepage. This could be determined by just asking yourself, “Is this a new thing or has there always been a wet spot around the sprinkler?”

If this has been an ongoing thing, the fix is very simple. The cause is the sprinkler being in a low spot in the system. When you see seepage it is because the line is being drained and should stop when the line is done draining. This can be fixed by purchasing a sprinkler that has a check valve installed at the bottom inlet of the sprinkler. The following manufactures refer to their product in the following terms: Rain Bird Sam, Toro Com, and Hunter CV. You can purchase any of these at any store that supplies the professional landscaper.
If you just noticed this problem it is because your diaphragm in your valve has gone bad. This could be due to the following reasons:
If the valve is new the following items could be causing the problem:
A. Glue could be keeping the diaphragm from closing completely.
B. B. Debris such as rocks, dirt, twigs, and Teflon tape.
  If the valve is old the following reason could be causing it to fail:
A.

The diaphragm could have a crack in it.
B. There could be debris holding it open.
C. There could be build-up on the diaphragm due to hard water or high iron content in the water.
  Follow the instructions below to fix this problem:
  You will need the following to complete this task:
  --New valve (get the exact same valve; it will make it easier) or a diaphragm that fits this valve.
Tip: It will be easier to identify the model and brand if you take the top of the valve in when purchasing the new parts.
--Screw driver
--Socket set
--Cup
--Water proof wire nuts
1.

1. Turn the water to the irrigation system off.
2. Take and remove the wire nuts from the wires. Only do this step if you couldn’t find a new diaphragm. Keep track of the common (usually white) and the hot (usually colored) wires.
3.

Take the screw driver or socket set and remove the screws or nuts.
4. Pull the valve bonet off of the valve - it should split in to two halves.
5. Remove the spring; be sure to take a good look at the way it was in the valve. If you are just replacing the diaphragm be sure not to loose the spring.
6. Set the screws and spring in the cup so they don’t get lost.
7. Remove the diaphragm from the valve. (it’s the rubber piece) Take a good look at the way it fits in.
8. Take the new one and install it the same way the old one was.
9. Now take the spring and place it the same exact way that it was installed in the old valve. Sometimes they are tapered the bigger end goes down and the smaller end goes upward if it is not tapered it doesn’t matter what way it goes.
10. If you purchased the new valve you now take the bonet and place it over the diaphragm.
11. Now you can start placing the screws or nuts back on.
12. Take the tool and tighten the screws or nuts.
13. Take and connect one of the wires from the solenoid to the common (usually white) and the other one to the hot (usually colored) it doesn’t matter which wire goes where.
14. Turn the manual bleed.
15. Go turn the water back on.
16. Turn the manual bleeder off.
17. Look for leaks.
18. Test with the irrigation controller by using the manual option.