Laura Díaz Muñoz, winemaker and general manager at Ehlers Estate in Napa Valley, is passionate about worms. They factor deeply into the notable focus on sustainability at Ehlers, a 130-year-old, certified-organic, family-owned property. It all begins with water. … Spread across five acres at the sprawling Parlier, California, facility of O’Neill Vineyards, what appear to be 12 Olympic-sized swimming pools are in fact sunken beds filled with worms. BioFiltro’s largest winery system to date, unveiled in September 2020, it’s capable of processing more than a million gallons of wastewater a day, and up to 80 million gallons a year.