Should be possible for saskatchewan to do the same then. No reason BC can't either since they've got the rockies, and an ocean.
Am I A) blind, B) something about the city here prevents rats from settling, or secret option C) something else entirely?
If you go look at any modern port you will see that the ships have large discs on any line going to shore.
That disc is an anti rat measure. At least one ship I worked on got rats, and we had to deal with them before we left port. Other ships certainly wouldn’t go through the effort.
I've wondered about BC though - outside the density of the lower mainland anyways.