The defendants in the case -- representing about 70 percent of the country's oil refiners -- agreed to make a cash payment of $423 million to water providers in a total of 17 states nationwide. Settling defendants in the case include BP Amoco, Atlantic Richfield, Chevron, Conoco Phillips, Shell, Marathon, Valero, CITGO, Sunoco, Hess, Flint Hills, El Paso Corp., Merchant Energy and Tesoro.