I like the dye idea. I gotta talk to my plumbing guru and get his take on this one. The evidence that I have proving that it can't be the septic system is the same evidence that may prove that it is. Nothing.
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The 1200 gal tank is located 20 feet away from the house. A 4" PVC main goes thru the basement wall near the top; maybe 2 feet down from the top/concrete. This would put the main running straight out and across the perimeter drain, about 7 feet above. This would also put the concrete tank higher than the perimeter drain, but 20 feet away. We just had the tank pumped and inspected this past spring. All systems go. I have to assume that the potential is: a) the main cracked b) the tank leaks. That's all I can think of...right? I mean, the main enters the tank at a point higher than high-water, so even if the main/tank junction is not water tight, it still shouldn't leak...right?
