I can only guess why but, where it is from. It came from somewhere, leaking window, roof, marker light. Might be entering the wall at some point, flowing inside and leaking out at the floor. Sounds like your ruling out water lines leaking but, think about everything that has water or water flows from/to. Water can travel out of site for a long ways. Water always flows downward. I always look up above where I find water or other higher points than where found.
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2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed, 3.55 rear end, lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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