As others have mentioned, Quebec's quality control tends to be pretty good, so looking for that branding and other wording to ensure that it's pure maple syrup

As others have mentioned, Quebec's quality control tends to be pretty good, so looking for that branding and other wording to ensure that it's pure maple syrup should be sufficient to ensure a certain quality floor. The sad reality is that getting good maple syrup outside of the areas that produce them is difficult. I personally like the syrup produced by Madawaska Maple Products, a small-batch co-op in Ontario. But even finding those in retail _within_ ontario is a bit of a crap shoot. Some speciality "hipster" stores carry it.