Water could be dripping from a humidifier connection
Water could be leaking from the condensate pan of an air conditioning evaporator in your furnace or air handler
The evaporator in the furnace could be frozen
Some contractors' will drill a hole through the concrete floor for the condensate to drain from the evaporator coil in the furnace because a drain was not available and it could be backing up.
Even the condensate drain pipe could become blocked form dirt that accumulates in the evaporator drain pan in the furnace or air handler.
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