Versions of Washington Code 70A.120.170 - Certification of backflow assembly testers and cross-connection control specialists on LawServer 2023 Washington Code 70A.120.170 – Certification of backflow assembly testers and cross-connection control specialists 2022 Washington Code 70A.120.170 – Certification of backflow assembly testers and cross-connection control specialists 2020 Washington Code 70A.120.170 – Certification of backflow assembly testers and cross-connection control specialists
