Water quality guideline(s)

‘A water quality guideline is a recommended numerical value of an indicator (e.g. of a contaminant) or a descriptive statement (e.g. visual appearance of a water body) that will support and maintain the designated environmental values (EVs) of a particular water type. (Note that water quality guidelines are nowadays taken to encompass not only the physical and chemical characteristics of waters but also biological and even habitat characteristics).’ — ANZECC/ARMCANZ (October 2000) Australian Guidelines for Water Quality Monitoring and Reporting. http://www.ea.gov.au/water/quality/nwqms
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