2023 Washington Code 18.89.100 – Certification — Competency requirements

2022 Washington Code 18.89.100 – Certification–Competency requirements

2020 Washington Code 18.89.100 – Certification — Competency requirements

2019 Washington Code 18.89.100 – Certification — Competency requirements

2018 Washington Code 18.89.100 – Certification — Competency requirements

2016 Washington Code 18.89.100 – Certification–Competency requirements

2015 Washington Code 18.89.100 – Certification–Competency requirements

2014 Washington Code 18.89.100 – Certification — Competency requirements

2013 Washington Code 18.89.100 – Certification — Competency requirements

2009 Washington Code 18.89.100 – Certification — Competency requirements