The Livermore Valley AVA is an American Viticultural Area in Alameda County, California, surrounding the city of Livermore in the Tri-Valley region. Both the AVA and the city are named after Robert Livermore, a landowner whose holdings encompassed the valley. The groundwater basin underlying the valley is the Livermore Basin, the largest sub-unit of which is the Mocho Subbasin. The Livermore Basin is one of five aquifers in the San Francisco Bay Area that supply most of the metropolitan Bay Area population. The entire Livermore Basin aquifer faces a concern over elevated total dissolved solids by the year 2020 due to an expanding human population leading to higher rates of return water flows to the aquifer containing certain salts. Wine production Wine has been cultivated in Livermore since the 19th century, with the Cresta Blanca Winery (founded 1882) being one of the earliest, and well-respected, with its first vintage (1884) winning Grand Prix at the 1889 Paris Exposition, becoming the first California wine to win a competition in France. Vineyards were shuttered during Prohibition, however, with the exception of two wineries, Concannon and Wente. In the early 1960s, Livermore had as much area under vine as Napa Valley did at that time. However, it remained relatively unknown, while Napa rose to worldwide prominence. Wente Vineyards has long been the largest producer in the Livermore Valley, making around 700,000 cases of wine annually with wholesale, tasting room and export sales. It was first established in the valley in 1883 and is now the oldest family owned continuously operated winery in the United States. The other large producer, Concannon Vineyard, was also established in 1883 and their wines are available nationally along with a tasting room for direct sales. Others are Raindrop Wine which also operates under Misson Wines, Murrieta's Well, The Winemakers' Studio, Steven Kent Winery, Wood Family Vineyards, McGrail Vineyards, Cuda Ridge Winery, Retzlaff Winery, Fenestra Winery, Occasio Winery, Stony Ridge/Crooked Vine Cellars, Longevity Wines, Rodrigue Molyneaux Winery, 3 Steves Winery, Rosa Fierro Cellars, Big White House/John Evan Cellars, Charles R Vineyards, Garre' Winery, Ehrenberg Cellars, The Singing Winemaker, Chouinard Vineyards, Elliston Vineyards, Las Positas Vineyards, Dante Robere Vineyards, Ruby Hill Winery, Rubino Estates, Bodegas Aguirre, Nottingham Cellars, Vasco Urbano Wine Company, Page Mill Winery, Bent Creek Winery and Nella Terra Cellars. Livermore possesses a predominately gravel based soil and lies on a unique east-west orientation, unlike many other winegrowing