2023 Washington Code 18.360.020 – Certification or registration required

2022 Washington Code 18.360.020 – Certification or registration required

2020 Washington Code 18.360.020 – Certification or registration required

2019 Washington Code 18.360.020 – Certification or registration required

2018 Washington Code 18.360.020 – Certification or registration required

2016 Washington Code 18.360.020 – Certification or registration required

2015 Washington Code 18.360.020 – Certification or registration required

2014 Washington Code 18.360.020 – Certification or registration required

2013 Washington Code 18.360.020 – Certification or registration required