Section R307-307-4 - Content(1) After October 1, 1993, any salt applied to roads in Salt Lake, Davis, or Utah counties shall be at least 92% NaCl, MgCl2, CaCl2, and/or KCl.(2) After January 1, 2014, any salt applied to roads in all other areas specified in R307-307-1 shall be no less than 92% by weight NaCl, MgCl2, CaCl2, and/or KCl.Utah Admin. Code R307-307-4