By Richard Parker, MBA, CHFM, CLSS-HC, FASHE, FACHE I n June 2023, ANSI/AAMI published a new standard for the selection and maintenance of an effective water quality system for processing medical devices. The new standard is the culmination of a decade of existing guidance. What has become ANSI/AAMI ST108:2023 started as a Technical Information Report (TIR). AAMI TIR34: 2014/(R)2017 served as initial guidance and was revised in 2021, followed by last year's release of the new standard (ST108).