(1) The following geographic rating areas are designated for Washington state for nongrandfathered individual and small group plans issued or renewed on or after January 1, 2019:

Area 1: King County.

Area 2/West: Clallam, Cowlitz, Grays Harbor, Jefferson, Kitsap, Lewis, Pacific, and Wahkiakum counties.

Area 3/South: Clark, Klickitat, and Skamania counties.

Area 4/Northeast: Ferry, Lincoln, Pend Oreille, Spokane, and Stevens counties.

Area 5/South Sound: Mason, Pierce, and Thurston counties.

Area 6/South Central: Benton, Franklin, Kittitas, and Yakima counties.

Area 7/North Central: Adams, Chelan, Douglas, Grant, and Okanogan counties.

Area 8/Northwest: Island, San Juan, Skagit, Snohomish, and Whatcom counties.

Area 9/Southeast: Asotin, Columbia, Garfield, Walla Walla, and Whitman counties.

(2) The commissioner will review the geographic rating area designation in this section not more frequently than every three years, beginning January 31, 2021.