RCW 58.20.165
Geodetic datums.
The official geodetic datums to which geodetic coordinates including, but not limited to, latitude, longitude, ellipsoid height, orthometric height, or dynamic height are referenced within the state of Washington must be as defined for the NSRS.
[ 2020 c 50 § 6.]
Structure Revised Code of Washington
Title 58 - Boundaries and Plats
Chapter 58.20 - Washington Plane Coordinate System.
58.20.121 - Washington plane coordinate system.
58.20.140 - Designation of system—Zones.
58.20.145 - Plane coordinates.
58.20.160 - Tracts in more than one zone.
58.20.180 - Recording coordinates.
58.20.185 - Standard value—One foot.
58.20.210 - United States survey prevails—Conflict.