Wash. Admin. Code § 458-53-140
(3) Stratification of rolls. Determination of strata for each county will be made by the department to ensure the selection of a representative audit sample and will be reviewed periodically. After the strata have been determined, the department will notify the counties of the strata limits and each county must provide the department with the following, taken from the county's assessment rolls:
(a) A representative number of samples, as determined by the department, in each stratum, together with:
[Statutory Authority: RCW 84.08.010, 84.08.070, and 84.48.075. WSR 16-11-031, § 458-53-140, filed 5/10/16, effective 6/10/16; WSR 02-14-031, § 458-53-140, filed 6/24/02, effective 7/25/02; WSR 96-05-002, § 458-53-140, filed 2/8/96, effective 3/10/96. Statutory Authority: RCW 84.48.075. WSR 84-14-039 (Order PT 84-2), § 458-53-140, filed 6/29/84; WSR 79-11-029 (Order PT 79-3), § 458-53-140, filed 10/11/79. Formerly WAC 458-52-080.]