2023 Washington Code 18.73.020 – Supersession of local regulation

2022 Washington Code 18.73.020 – Supersession of local regulation

2020 Washington Code 18.73.020 – Supersession of local regulation

2019 Washington Code 18.73.020 – Supersession of local regulation

2018 Washington Code 18.73.020 – Supersession of local regulation

2016 Washington Code 18.73.020 – Supersession of local regulation

2015 Washington Code 18.73.020 – Supersession of local regulation

2014 Washington Code 18.73.020 – Supersession of local regulation

2013 Washington Code 18.73.020 – Supersession of local regulation

2009 Washington Code 18.73.020 – Supersession of local regulation