2023 Washington Code 18.108.030 – Licensure or certification required

2022 Washington Code 18.108.030 – Licensure or certification required

2020 Washington Code 18.108.030 – Licensure or certification required

2019 Washington Code 18.108.030 – Licensure or certification required

2018 Washington Code 18.108.030 – Licensure or certification required

2016 Washington Code 18.108.030 – Licensure or certification required

2015 Washington Code 18.108.030 – Licensure or certification required

2014 Washington Code 18.108.030 – Licensure or certification required

2013 Washington Code 18.108.030 – Licensure or certification required

2009 Washington Code 18.108.030 – License required