This standard covers the use of granular and extruded activated carbons as a filter medium and adsorbent in water treatment. It involves the selection, placement, and use of granular activated carbon (GAC) in filter-adsorbers where the GAC must function as both a filter medium and adsorbent, as well as those systems where the primary function is adsorption. Section 1 discusses scope, purpose and application. Sections 2 and 3 list references and definitions. Section 4 lists requirements, including: physical requirements; performance criteria; and, impurities. Section 5 discusses verification including: sampling; test procedures; and, rejection. Section 6 discusses delivery including: marking; packaging and shipping; and, affidavit of compliance. Section 7 discusses placing of GAC filter material including: preparation; placement of support media; placement of GAC; top surface elevation; and, contamination. Section 8 discusses preparation of filter for service including: backwashing; scraping; disinfection; cleaning; and, safety. Appendices provide a bibliography, and methods for adsorptive capacity testing including tannin and phenol. The major revisions in this edition of ANSI/AWWA B604 includes the following: the format has been changed to AWWA standard style, and parameters required to specify GAC as a filter/adsorber, as well as an adsorbent, have been included.