... of water quality management, she was responsible for ensuring compatibility with Water Quality Assessments and Water Quality Monitoring, two of the other books in the series. Water Pollution ... requirements on water quality and, therefore, the associated water quality criteria are often different for each use. Box 2.1 Examples of the development of national water quality criteria and guidelines ... threshold values for water quality that should be maintained or achieved within a certain time period. Water quality objectives provide the basis for pollution control regulations and for carrying...