North Carolina Administrative Code Title 17 — Revenue 17 NCAC 07B .0610 — Water Purification Equipment And Chemicals Last amended: Authority G.S. 105-164.4; 105-164.6; 105-262; 105-264; Eff. February 1, 1976; Amended Eff. October 1, 1993; October 1, 1991; April 1, 1986; July 5, 1980; May 11, 1979; September 30, 1977; Repealed Eff. July 1, 2006. Source: official text