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Mumm Napa is one of California's sparkling wine producers. The company is a joint venture between the G.H. Mumm Cie and Joseph E Seagram Sons. The location at Napa Valley was founded by Guy Deveaux, who determined Napa's long hot days and cold nights to be ideal for producing the right amount of acidity and ripeness. Mumm Napa sources grapes from the cool southern Carneros region and along the Napa River headed north towards Yountville. Each of the areas lends a different characteristic to the wine. Carneros Chardonnay is lush and tropical, while mid valley Pinot Noir has bright berry concentration. Mumm Napa is based in Rutherford, CA.