The Canadian Water Quality Index (CWQI) is an effective method to rate the water quality and determine its suitability for drinking purposes. CWQI measures a wide variety of parameters of water quality and then cumulatively translate them into one score.
The CWQI method requires a group of parameters that have drinking water objectives that have been set either by the Canadian government or a province to ensure that the water intended for human consumption.
The CWQI calculates three factors based on these objectives:
These factors are combined to give an overall rating.
A summary of the results is presented in a donut-like chart.
The colouring system is represented by:
The sample example provided has a CWQI of 62 (out of 100). The quality is fair.
A detailed summary of the parameters tested, why each parameter is important, and treatment options are provided in Appendix A.