What Ingredients Go on a Napa Valley Wine Label? Demystifying Voluntary Disclosure and Transparency in Viticulture

Most wine sold in the United States lists no ingredients, because federal rules don’t require it. This paper explains what can legally go into a wine, what a label has to say today, and what a winery can choose to share on its own. It uses Honig Vineyard & Winery in Rutherford, Napa Valley as a case study. Honig is one of the first wineries in Napa Valley to list ingredients on the label, starting with its 2025 Napa Valley Sauvignon Blanc: grapes, yeast and sulfites. The paper covers why sulfites are used, why more consumers want to know what is in their wine, and what voluntary disclosure means for wineries considering the same step.