Hardly possible to determine exactly, since creep is neutral (who would be the owner of the creep, if creep tumors of 2 different players are creating creep at the same spot?)
Otherwise, just scan for nearby tumors/hatcherys/overlords with enabled creep urination. Would fail for trigger-placed creep and for any degenerating creep with its source destroyed, though.
Hardly possible to determine exactly, since creep is neutral (who would be the owner of the creep, if creep tumors of 2 different players are creating creep at the same spot?)
Otherwise, just scan for nearby tumors/hatcherys/overlords with enabled creep urination. Would fail for trigger-placed creep and for any degenerating creep with its source destroyed, though.