Yes, as a general matter it is legal for a city to repeal any civil service regulations it has enacted and to instead operate in accordance with chapter 41.12 RCW. The Vahle v. City of Lakewood (2020) case includes a good discussion of this issue (with emphasis added):
Chapter 41.12 RCW serves as model civil service system that cities may follow to fill the requirement of providing a civil service system. Cities run the spectrum from adopting all the procedures and policies set forth in chapter 41.12 RCW or forgoing the model entirely by enacting a system unique to the city pursuant to RCW 41.12.010.
RCW 41.12.010 states, in relevant part: “The provisions of this chapter shall have no application to cities and towns which at the present time have provided for civil service in the police department ... by local charter or other regulations which ... substantially accomplish the purpose of this chapter.” However, if any city repeals the local charter or local acts providing for civil service, the model system applies. RCW 41.12.020.
However, repealing enacted civil service regulations could impact a city’s police department (or its collective bargaining agreements, if any) in specific ways that should be reviewed with the city attorney for a definitive opinion and advice on whether this otherwise lawful practice is advisable for the city in this instance.
