Napa Soap Company 651 Main St, Saint Helena, CA94574-2004 Napa Soap Company is a family-owned and -operated business that produces specialty soap. All the soap is handmade in…More Napa Valley using grape seed oil and wine from the region. The soap is made by hand in small batches. It is sold in stores across the country and online, as well as at the Napa Soap Company store on Main Street in St. Helena. The company was established in 1999.