You can try sending the picture to the Burrowing Owl Conservation Society of BC at:
bocsbc@gmail.com
I’m not sure if they will be able to help you or not, but it’s worth a try.
Added: I did a little digging and found out that the green and black band is unique to BC
“All of the released adult owls and 4-5 week old wild-born juveniles are banded with a US Fish and Wildlife Service aluminum band and a Green/Black alpha-numeric band. The Green/Black band is unique to BC burrowing owls, allowing them to be identified along their migration route and on the wintering grounds. BC owls have been sighted from Washington to California.” (Aug 19, 2014 by Lauren Meads, South Okanagan Site Coordinator, BOCSBC)
So your bird was banded in BC by the BOCSBC.
Oh, and after all of that I neglected to say that I love your picture, what with the direct eye contact and all. Congratulations on an excellent capture.