Author Description

The British Columbia water quality index reduces technical water quality information to a simple description of the state of water quality. The index ranks water quality into one of five categories, each describing the state of water quality compared to objectives that usually represent the natural state. The index can be used to describe the state of water quality as a whole in a body of water, and also shows the suitability of water for various uses such as drinking, recreation, and agriculture. This document is a guide to those who wish to gain a basic understanding of how the water quality index works. It includes the meaning of each water quality ranking, steps to follow in calculating the index, and information on provincial setting of water quality objectives and on application of the water quality index.