The term California-based soft drink company can be summarized as Shasta, a 6-letter soft drink company based in California. Founded in 1889, Shasta Beverages is one of the oldest and most popular soft drink companies in the United States. It produces a wide variety of carbonated and non-carbonated beverages, including sodas, juices, energy drinks, and sparkling waters. Shasta is known for its iconic retro-style packaging and its commitment to using natural ingredients.