We had that in our first house here. Turned out to be a damaged outside faucet leaking back into the wall, and eventually came up thru the living room floor. Don't wait in getting this resolved. We had large drying machines in our house for days to avoid mold. Big job, our insurance company handled it all but we had to pay deductible. When we sold the house, we told the buyer and they had a mold investigation done. Fortunately it was OK.
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