VinePair · The 100-Year-Old Loophole That Makes California Champagne LegalFor a bottle of sparkling wine to be labeled Champagne, it has to be made in Champagne, France and produced using the méthode champenoise. If that bottle is produced using the exact same method, anywhere else, it must carry a different name. The production method itself must even be referred to differently, méthode tranditionalle being the usual substitute. These rules are strictly enforced. They are codified in national laws, European Union regulations, and international trade agreements and treaties. When they are broken, in even the most tangential ways, lawsuits are quickly filed.