This text, prepared by an international group of experts, addresses the 'heterotrophic plate count' test which is widely used in drinking-water assessment: what it detects (and what it does not detect), its direct and indirect health significance, and its use in the safety management of drinking water supplies. It includes the consensus statement from an expert review meeting and takes account of the presentations and posters at an international conference on the theme co-sponsored by WHO and NSF-International. It provides valuable information on the utility and the limitations of HPC data in the management and operation of piped water systems, as well as other means of providing drinking water to the public. It is of particular value to piped public water suppliers and bottled water suppliers, manufacturers and users of water treatment, and transmission equipment and inline treatment devices, water engineers, sanitary and clinical microbiologists, and national and local public health officials and regulators of drinking water quality.
Engineering-Transportation, Engineering, Civil-Environmental, Environmental, Water-Quality-Treatment,