SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

Don't just turn the controller to off. Shut the valve that supplies the sprinkler system. Let everything drain and dry out. Then turn the supply valve back on, and look for leaks.

Not normal to have water there.

Check that the bleed screws are off and the solenoids are off of manual operation.

If the system was winterized last Fall these could have been left open.

The home builder told you it's normal? Is this a new home? He's just avoiding doing warranty work. He doesn't want to work for free. If he refuses to fix the problem hire a guy then hand the bill to the builder.

If you want to do it yourself find the valve that shuts off the water to the whole sprinkler system. That on/off thing is your solenoid and has nothing to do with turning the water OFF.

If you can't find the shut off valve then turn your entire water supply off overnight or when you don't need it. Bail the water out of the boxes first. The next day when you turn it back on watch very carefully where for the leak. You'll probably wind up digging one of the boxes up. Careful of cutting the wires.

Ask them to pressure test the mainline. If they don't know how or won't, then tell them you're hiring a professional at their expense.
Pressure testing the mainline will tell you with 100% certainty if there is a leak in any portion of your mainline and valves.