I would have it snaked out to clear it. depending on where the drain runs to that standing water may be sitting in the trap, which is keeping sewer gas from coming out into the room, if you suck out the water then the gas can get in.
It's illegal to dump washing machine or sinks into a floor drain that does not go to the sewer system.
If it's just a water softners flush line that's fine.
Last edited by joecaption; 11-23-2011 at 03:21 PM.