Swig, the Utah-born beverage chain that helped popularize “dirty soda,” is finding some of its strongest growth well beyond its home state.

Andrew K. Smith, managing director and co-founder of restaurant-focused private equity firm Savory Fund, told FOX Business that Swig locations outside Utah are performing roughly 40% to 50% better than stores within the state.

The chain now operates in 23 states and expects to reach about 200 locations by the end of the year, Smith said, with additional expansion planned for next year.

Swig is best known for highly customizable drinks, particularly “dirty sodas” — fountain drinks mixed with flavored syrups…

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