(1) The primary division of the Washington Administrative Code (WAC) is the Title. The office of the code reviser assigns each agency a title number, which usually is in alphabetical order. A newly created agency shall apply to the office of the code reviser for assignment of a title number. If an agency's name is changed, the title number stays the same. The list of titles is published in volume 1 of the WAC.

(2) Each title is divided into chapters, which are the major subject matter divisions of the agency's title.

(3) Each chapter is divided into sections, which are the individual rules and are the smallest unit that can be amended. The agency shall place a short caption on each section to describe its contents. Sections should be as short as reasonably possible to facilitate finding an individual rule and amending it in the future.

(4) The WAC citation number is a composite of these three divisions: