2023 Washington Code 19.122.120 – One-number locator service to provide excavation confirmation code

2022 Washington Code 19.122.120 – One-number locator service to provide excavation confirmation code

2020 Washington Code 19.122.120 – One-number locator service to provide excavation confirmation code

2019 Washington Code 19.122.120 – One-number locator service to provide excavation confirmation code

2018 Washington Code 19.122.120 – One-number locator service to provide excavation confirmation code

2016 Washington Code 19.122.120 – One-number locator service to provide excavation confirmation code

2015 Washington Code 19.122.120 – One-number locator service to provide excavation confirmation code

2014 Washington Code 19.122.120 – One-number locator service to provide excavation confirmation code

2013 Washington Code 19.122.120 – One-number locator service to provide excavation confirmation code

2009 Washington Code 19.122.120 – One-number locator service to provide excavation confirmation code