AnchorFoundation said:
I would not suspect the drain line.
IF there was a break at the clean out, it should be so far below grade that it won't keep your grass green. Worth pulling the cap off and seeing how deep the main line is.
What's the orientation on your house? Is this on the north east side and getting a little more shade in the afternoon?
This is the north side and east of the garage on the right. Not sure if gets substantially more shade, but I considered that as well. There is a mature tree a couple feet behind where I'm standing that gives the front some decent shade.
There is a low roof over the porch that ends where that column is. Garage extends out from the house on the right. Now that i think of it, any runoff from the roof ends up here, so it may just be that this got a little extra water the last time we had rainy weather coming through. We'll usually get some runoff from the roof even when it just sprinkles and doesn't even wet the yard.
I'll maybe pull the cap in the next couple days, but this does help me sleep a little better. And now that I'm looking at it, it's green a little more uphill that downhill. Probably not something a leak would do.