Came back to GA after another round of docs poking proving and all the other BS.
Found a wet front yard as in a few inches of standing water against the house on one side.
Tried poking around with a flashlight to see if an upwelling area could be approximated, but, lungs weren't having it. Not just tree sperm trying to kill you season, but, this month my blood saturation c02 was at 120% of the high-limit - 36 mmol/L above a 23-29 as suggested range as normal low to high.
That's two months worth of climb. Had 9 months steady baseline data holding @ 27 to 26, wobbling, then 2 months now of increases of 4 and 5. To me, that spells trend. So, tomorrow we'll call a plumbing company to come figure out whats going on out there which also appears to have caused last month's water usage peaking to 45,000 gallons (luckily not city water, but, still a $200 cost for electric, pumps, etc.)
I'm sure it'll be at least $1000 fix between finding then repairing the leak.