READ ME This text describes the data presented in the paper: ======================== Introductory information ======================== Files included in the data deposit (include a short description of what data are contained): 1) Paper.xls contains the numerical data underpinning the figures in the paper 2) 3) Explain the relationship between multiple data sets, if required: Key words used to describe the data: Averages and standard deviations for measurements underpinning the figures ========================== Methodological information ========================== A brief method description – what the data is, how and why it was collected or created, and how it was processed: Trihalomethanes concentrations, see analytical method description in the paper. Instruments, hardware and software used: Agilent GC-ECD, Microsoft Excel Date(s) of data collection: 01/09/2012 - 31/12/2014 Geographic coverage of data: UK Data validation (how was the data checked, proofed and cleaned): Instrument calibration with external standard, recovery with internal standard, as described in the analytical method description in the paper Overview of secondary data, if used: ========================= Data-specific information ========================= Definitions of names, labels, acronyms or specialist terminology uses for variables, records and their values: THMs = trihalomethanes, sum of trichloromethane, bromodichloromethane, dibromochloromethane and tribromomethane Explanation of weighting and grossing variables: Outline any missing data: ======= Contact ======= Please contact rdm@ncl.ac.uk for further information