With thanks to Andrew Tonkin, SES Water for highlighting the missing publication from our Microbiology of Drinking Water Series. Part 4 – Methods for the Isolation and enumeration of coliform bacteria and Escherichia coli (including E. coli O157 H7) was published in 2016 and otherwise not published in our online Library. Thank you also to Jonathan Cannon, Drinking Water Inspectorate and Aleksandra Rafalska, Wessex Water Scientific Centre for also reporting this issue. Download Here!