Guess I would depart a little from what the others said.
Good news is, yes, it is working, as indicated by the green going all the way out to the ends of the lines. Old type gravity leach systems fail by filling with solids, starting at the outer ends, and working their way up the line. When the lines are plugged all the way to the distribution box (or far enough up that the outflow of tank doesn't keep up with inflow, hence a backup), you get to install a new system. You probably came close to that situation when the kids were home, and it came to the top.
Bad news is, effluent isn't being absorbed into the soil very well- moisture should go DOWN, not up- so the ideal situation is no green over the leach field. Your soil isn't as absorbent as you'd like to see, but "it is what it is", and not much can be done about it, short of an expensive new system.
So just keep the grease out of it, make sure the baffle is intact, get it pumped every 5-7 years, and it should be fine. Someone else stated one of life's truisms- "If it ain't broke, don't fix it."
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