Washington Code > Chapter 51.18 > § 51.18.060 Washington Code 51.18.060 – Retrospective rating groups — Department approval Current as of: 2023 | Check for updates | Other versions All retrospective rating groups approved by the department prior to July 25, 1999, under RCW 51.16.035 as it existed prior to July 25, 1999, remain approved and, with the exception of RCW 51.18.020, are subject to the provisions of this chapter. [ 1999 c 7 § 7.] Ask an insurance law question, get an answer ASAP!Click here to chat with a lawyer about your rights. Previous sectionNext section Chapter 51.18 Contents