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The Swiss Federal Institute for Environmental Science and Technology carried out a major review on monitoring parameters and testing methods relevant to the control of the microbial safety of drinking water. This is the resultant guidance document. It gives guidance on the appropriate application of monitoring parameters for ensuring the safety of drinking water and to inform risk management decisions, with an emphasis on control of faecal contamination. It offers guidance on how to select and use multiple parameters to meet specific information needs as a support to safe practice throughout the whole water system: catchment protection and assessment, source water quality assessment, assessment of treatment efficacy, monitoring the quality of drinking water leaving the treatment facility and in the distribution system. It also offers a comprehensive review of traditional index and indicator organisms and emerging technologies. |