Evaluating the Performance of Water Quality Indices: Application in Surface Water of Lake Union, Washington State-USA

Water quality indices (WQIs) are practical and versatile instruments for assessing, organizing, disseminating information about the overall status of surface water bodies. The use these may be beneficial in evaluating aquatic system quality. CCME (Canadian Council Ministers Environment) NSF (National Science Foundation) WQIs were used assessment (depth = 1 m) Lake Union, Washington State. These at Seattle. modified versions applied incorporate a varied number investigated parameters. two implemented utilizing specialized, publicly accessible software tools. A comparison their performance is offered, along with qualitative appropriateness describing body. Practical conclusions generated addressed based on applicability disadvantages evaluated indexes. When compared to CCME-WQI, it found that NSF-WQI more robust index yields categorization stricter than CCME-WQI.