PDFWAC 246-291-220
Group B system disinfection.
(1) A purveyor shall disinfect a Group B system before providing service to any consumer.
(2) The water system disinfection procedures must conform to the following standards:
(a) AWWA C651-05 or APWA/WSDOT (2010 revision), for water main disinfection;
(b) AWWA C652-02, for reservoir disinfection; and
(c) AWWA C654-03, for well disinfection.