CCME has posted Water Quality Index 2.0 calculator and Water Quality Index User’s Manual 2017 Update, replacing the Water Quality Index 1.2 published in 2011.
The revised and updated index provides a consistent approach to summarizing complex water quality data and facilitating its communication. It incorporates scope - the number of parameters not meeting water quality guidelines; frequency - the number of times these guidelines are not met; and amplitude - the amount by which the guidelines are not met. The index produces a number between 0 (worst water quality) and 100 (best water quality).
The user’s manual provides guidance on key calculations and application of the index as well as examples of its use.
Please click on the following link for details: http://www.ccme.ca/en/resources/canadian_environmental_quality_guidelines/calculators.html